* [syzbot] [usb?] INFO: rcu detected stall in schedule_timeout (6)
@ 2024-05-16 19:17 syzbot
2024-05-16 22:01 ` syzbot
0 siblings, 1 reply; 6+ messages in thread
From: syzbot @ 2024-05-16 19:17 UTC (permalink / raw)
To: bp, dave.hansen, hpa, linux-kernel, linux-usb, mingo,
syzkaller-bugs, tglx, x86
Hello,
syzbot found the following issue on:
HEAD commit: 75fa778d74b7 Add linux-next specific files for 20240510
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=104afcd0980000
kernel config: https://syzkaller.appspot.com/x/.config?x=ccdd3ebd6715749a
dashboard link: https://syzkaller.appspot.com/bug?extid=c793a7eca38803212c61
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16dcd598980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=151d9c78980000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/ad9391835bcf/disk-75fa778d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d827b3da9a26/vmlinux-75fa778d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/8f32f0182388/bzImage-75fa778d.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c793a7eca38803212c61@syzkaller.appspotmail.com
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: (detected by 1, t=10503 jiffies, g=6805, q=1118 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 9183 (4294974670-4294965487), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 9183 jiffies! g6805 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt state:R
running task
stack:26320 pid:17 tgid:17 ppid:2 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5408 [inline]
__schedule+0x17e8/0x4a50 kernel/sched/core.c:6745
preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7067
irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__timer_delete_sync+0x1d9/0x310 kernel/time/timer.c:1655
Code: eb 0f 85 ee 00 00 00 e8 95 30 13 00 4c 8b 6c 24 18 4d 85 f6 75 07 e8 86 30 13 00 eb 06 e8 7f 30 13 00 fb 65 8b 1d ff e8 80 7e <89> de 81 e6 00 00 0f 00 31 ff e8 a8 34 13 00 81 e3 00 00 0f 00 74
RSP: 0018:ffffc90000167aa0 EFLAGS: 00000293
RAX: ffffffff8182ec01 RBX: 0000000080000000 RCX: ffff888017ad0000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000167b70 R08: ffffffff8182ebdd R09: 1ffffffff1f5a67d
R10: dffffc0000000000 R11: fffffbfff1f5a67e R12: 1ffff9200002cf58
R13: ffffc90000167ba0 R14: 0000000000000200 R15: dffffc0000000000
timer_delete_sync kernel/time/timer.c:1720 [inline]
del_timer_sync include/linux/timer.h:185 [inline]
schedule_timeout+0x1c8/0x310 kernel/time/timer.c:2582
rcu_gp_fqs_loop+0x2df/0x1370 kernel/rcu/tree.c:2000
rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2202
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
NMI backtrace for cpu 0
CPU: 0 PID: 8 Comm: kworker/0:0 Not tainted 6.9.0-rc7-next-20240510-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Workqueue: wg-kex-wg1 wg_packet_handshake_receive_worker
RIP: 0010:format_decode+0x539/0x1bb0 lib/vsprintf.c:2568
Code: b6 f7 31 ff e8 68 59 12 f6 4d 39 e5 0f 85 96 01 00 00 45 84 ff 0f 84 8d 01 00 00 48 bb 00 ff ff ff 00 ff ff ff 48 8b 44 24 20 <42> 0f b6 04 30 84 c0 0f 85 4d 10 00 00 48 8b 54 24 48 48 21 da 48
RSP: 0018:ffffc90000006ca0 EFLAGS: 00000002
RAX: 1ffff92000000dc4 RBX: ffffff00ffffff00 RCX: ffff8880172bda00
RDX: ffff8880172bda00 RSI: 0000000000000025 RDI: 0000000000000000
RBP: ffffc90000006d90 R08: ffffffff8b83c618 R09: ffffffff8b83c2fa
R10: 0000000000000002 R11: ffff8880172bda00 R12: ffffffff8bcb7a06
R13: ffffffff8bcb7a06 R14: dffffc0000000000 R15: 0000000000000025
FS: 0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056361e896040 CR3: 000000007e8b4000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<NMI>
</NMI>
<IRQ>
vsnprintf+0x14f/0x1da0 lib/vsprintf.c:2776
sprintf+0xda/0x120 lib/vsprintf.c:3028
print_time kernel/printk/printk.c:1327 [inline]
info_print_prefix+0x16b/0x310 kernel/printk/printk.c:1353
record_print_text kernel/printk/printk.c:1402 [inline]
printk_get_next_message+0x6da/0xbe0 kernel/printk/printk.c:2855
console_emit_next_record kernel/printk/printk.c:2895 [inline]
console_flush_all+0x410/0xfd0 kernel/printk/printk.c:2994
console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3063
vprintk_emit+0x5a6/0x770 kernel/printk/printk.c:2345
dev_vprintk_emit+0x2ae/0x330 drivers/base/core.c:4951
dev_printk_emit+0xdd/0x120 drivers/base/core.c:4962
_dev_warn+0x122/0x170 drivers/base/core.c:5018
usb_rx_callback_intf0+0x15a/0x1a0 drivers/media/rc/imon.c:1771
__usb_hcd_giveback_urb+0x373/0x530 drivers/usb/core/hcd.c:1648
dummy_timer+0x830/0x45d0 drivers/usb/gadget/udc/dummy_hcd.c:1987
__run_hrtimer kernel/time/hrtimer.c:1687 [inline]
__hrtimer_run_queues+0x5a5/0xd50 kernel/time/hrtimer.c:1751
hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1813
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline]
__sysvec_apic_timer_interrupt+0x110/0x3f0 arch/x86/kernel/apic/apic.c:1049
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1043
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:preempt_count_sub+0x47/0x170 kernel/sched/core.c:5902
Code: df 42 0f b6 04 30 84 c0 0f 85 d0 00 00 00 83 3d 1e 11 15 13 00 75 22 65 8b 05 3d 3f 9e 7e 89 c1 81 e1 ff ff ff 7f 39 d9 7c 27 <81> fb fe 00 00 00 77 07 0f b6 c0 85 c0 74 5f 65 8b 05 1b 3f 9e 7e
RSP: 0018:ffffc900000d7308 EFLAGS: 00000246
RAX: 0000000080000001 RBX: 0000000000000001 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: 0000000000000001 R08: ffffffff813613fd R09: 0000000000000000
R10: ffffc900000d74e0 R11: 4d80d23fb8bc9d0a R12: ffffc900000d74a0
R13: ffffc900000d74e0 R14: dffffc0000000000 R15: ffffc900000d7470
kernel_fpu_end+0x38/0x80 arch/x86/kernel/fpu/core.c:451
blake2s_compress+0x5f/0xd0 arch/x86/crypto/blake2s-glue.c:49
blake2s_final+0xb5/0x190 lib/crypto/blake2s.c:54
mix_hash drivers/net/wireguard/noise.c:439 [inline]
message_ephemeral+0x293/0x4f0 drivers/net/wireguard/noise.c:492
wg_noise_handshake_consume_initiation+0x3a4/0xf70 drivers/net/wireguard/noise.c:605
wg_receive_handshake_packet drivers/net/wireguard/receive.c:144 [inline]
wg_packet_handshake_receive_worker+0x5bb/0xf50 drivers/net/wireguard/receive.c:213
process_one_work kernel/workqueue.c:3231 [inline]
process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
worker_thread+0x86d/0xd70 kernel/workqueue.c:3393
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 3.485 msecs
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
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imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
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imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
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imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
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imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
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imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
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imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
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imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
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imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
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imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
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imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): igno
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [syzbot] [usb?] INFO: rcu detected stall in schedule_timeout (6)
2024-05-16 19:17 [syzbot] [usb?] INFO: rcu detected stall in schedule_timeout (6) syzbot
@ 2024-05-16 22:01 ` syzbot
2024-06-04 12:05 ` Marcello Sylvester Bauer
0 siblings, 1 reply; 6+ messages in thread
From: syzbot @ 2024-05-16 22:01 UTC (permalink / raw)
To: bp, dave.hansen, gregkh, hpa, linux-kernel, linux-usb,
marcello.bauer, mingo, stern, sylv, syzkaller-bugs, tglx, x86
syzbot has bisected this issue to:
commit a7f3813e589fd8e2834720829a47b5eb914a9afe
Author: Marcello Sylvester Bauer <sylv@sylv.io>
Date: Thu Apr 11 14:51:28 2024 +0000
usb: gadget: dummy_hcd: Switch to hrtimer transfer scheduler
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=119318d0980000
start commit: 75fa778d74b7 Add linux-next specific files for 20240510
git tree: linux-next
final oops: https://syzkaller.appspot.com/x/report.txt?x=139318d0980000
console output: https://syzkaller.appspot.com/x/log.txt?x=159318d0980000
kernel config: https://syzkaller.appspot.com/x/.config?x=ccdd3ebd6715749a
dashboard link: https://syzkaller.appspot.com/bug?extid=c793a7eca38803212c61
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16dcd598980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=151d9c78980000
Reported-by: syzbot+c793a7eca38803212c61@syzkaller.appspotmail.com
Fixes: a7f3813e589f ("usb: gadget: dummy_hcd: Switch to hrtimer transfer scheduler")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [syzbot] [usb?] INFO: rcu detected stall in schedule_timeout (6)
2024-05-16 22:01 ` syzbot
@ 2024-06-04 12:05 ` Marcello Sylvester Bauer
2024-06-04 14:20 ` Alan Stern
2024-06-24 10:25 ` Needed help: dummy_hcd: Fix stalls/inconsistent_lock_state due to hrtimer migration Marcello Sylvester Bauer
0 siblings, 2 replies; 6+ messages in thread
From: Marcello Sylvester Bauer @ 2024-06-04 12:05 UTC (permalink / raw)
To: syzbot, bp, dave.hansen, gregkh, hpa, linux-kernel, linux-usb,
mingo, stern, syzkaller-bugs, tglx, x86
Cc: Greg Kroah-Hartman, Marcello Sylvester Bauer, Matthias Stoeckl,
Uwe Kleine-Koenig
[-- Attachment #1: Type: text/plain, Size: 1576 bytes --]
Greetings,
I'm currently investigating this regression to properly fix it. My
patch only replaces the corresponding timer API calls without actually
changing the code. I'm trying to get it to work properly with the
hrtimer API.
Any hints on how to accomplish this are welcome.
Thanks
Marcello
On Thu, 2024-05-16 at 15:01 -0700, syzbot wrote:
> syzbot has bisected this issue to:
>
> commit a7f3813e589fd8e2834720829a47b5eb914a9afe
> Author: Marcello Sylvester Bauer <sylv@sylv.io>
> Date: Thu Apr 11 14:51:28 2024 +0000
>
> usb: gadget: dummy_hcd: Switch to hrtimer transfer scheduler
>
> bisection log:
> https://syzkaller.appspot.com/x/bisect.txt?x=119318d0980000
> start commit: 75fa778d74b7 Add linux-next specific files for
> 20240510
> git tree: linux-next
> final oops:
> https://syzkaller.appspot.com/x/report.txt?x=139318d0980000
> console output:
> https://syzkaller.appspot.com/x/log.txt?x=159318d0980000
> kernel config:
> https://syzkaller.appspot.com/x/.config?x=ccdd3ebd6715749a
> dashboard link:
> https://syzkaller.appspot.com/bug?extid=c793a7eca38803212c61
> syz repro:
> https://syzkaller.appspot.com/x/repro.syz?x=16dcd598980000
> C reproducer:
> https://syzkaller.appspot.com/x/repro.c?x=151d9c78980000
>
> Reported-by: syzbot+c793a7eca38803212c61@syzkaller.appspotmail.com
> Fixes: a7f3813e589f ("usb: gadget: dummy_hcd: Switch to hrtimer
> transfer scheduler")
>
> For information about bisection process see:
> https://goo.gl/tpsmEJ#bisection
[-- Attachment #2: This is a digitally signed message part --]
[-- Type: application/pgp-signature, Size: 874 bytes --]
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [syzbot] [usb?] INFO: rcu detected stall in schedule_timeout (6)
2024-06-04 12:05 ` Marcello Sylvester Bauer
@ 2024-06-04 14:20 ` Alan Stern
2024-06-24 10:25 ` Needed help: dummy_hcd: Fix stalls/inconsistent_lock_state due to hrtimer migration Marcello Sylvester Bauer
1 sibling, 0 replies; 6+ messages in thread
From: Alan Stern @ 2024-06-04 14:20 UTC (permalink / raw)
To: Marcello Sylvester Bauer
Cc: syzbot, bp, dave.hansen, gregkh, hpa, linux-kernel, linux-usb,
mingo, syzkaller-bugs, tglx, x86, Matthias Stoeckl,
Uwe Kleine-Koenig
On Tue, Jun 04, 2024 at 02:05:12PM +0200, Marcello Sylvester Bauer wrote:
> Greetings,
>
> I'm currently investigating this regression to properly fix it. My
> patch only replaces the corresponding timer API calls without actually
> changing the code. I'm trying to get it to work properly with the
> hrtimer API.
>
> Any hints on how to accomplish this are welcome.
Start by figuring out what isn't getting executed. That is, which USB
(or usb_request) transfer isn't completing. Once you know that, see
what timer callbacks do occur (if any) and figure out why they don't
cause the transfer to complete.
If there are no timer callbacks at all when the hang occurs, make a
record (printk if nothing else), from the start of the test, of each
callback and each timer restart, so you can definitively prove to the
hrtimer maintainers that there's a restart with no later callback. Then
it will be up to them to figure out what's going wrong.
Alan Stern
^ permalink raw reply [flat|nested] 6+ messages in thread
* Needed help: dummy_hcd: Fix stalls/inconsistent_lock_state due to hrtimer migration
2024-06-04 12:05 ` Marcello Sylvester Bauer
2024-06-04 14:20 ` Alan Stern
@ 2024-06-24 10:25 ` Marcello Sylvester Bauer
2024-06-24 13:19 ` Thomas Gleixner
1 sibling, 1 reply; 6+ messages in thread
From: Marcello Sylvester Bauer @ 2024-06-24 10:25 UTC (permalink / raw)
To: linux-kernel, linux-usb, x86, syzbot+c793a7eca38803212c61,
syzbot+5127feb52165f8ab165b, oe-lkp, bp, dave.hansen,
syzkaller-bugs
Cc: Anna-Maria Behnsen, Frederic Weisbecker, Thomas Gleixner,
Uwe Kleine-Koenig, gregkh, hpa, mingo, stern, Alan Stern,
Matthias Stoeckl
[-- Attachment #1: Type: text/plain, Size: 3595 bytes --]
Hi everyone,
I need some help evaluating and fixing a regression due to migration to
hztimer scheduler in dummy_hcd.
About two months ago I was investigating poor performance for the mass
storage gadget (g_mass_storage) due to slow timings in the loopback hcd
driver (dummy_hcd). One of the reasons was that dummy_hcd used the old
timer API, where the interval is tied to the internal kernel timer
frequency. So I submitted the patch to migrate to the hrtimer API[^1],
which was quickly approved.
Since then, syzbot[^2][^3] and intel's kernel test bot[^4] are
detecting rcu stalls/inconsistent_lock_state due to my patch, and I'm
trying to figure out how to fix it.
Both bots indicate that the problem is around the usb_hcd_giveback_urb
function call and it's locking mechanism.
My patch just replaces the timer API calls without changing anything
else in the code, so I'm not sure if my patch is actually the root
cause here. And following the instructions to reproduce syzbot
regressions[^5] even with the provided assets (bzImage, disk image,
repro.c) it is quite inconsistent to cause this stall. I have also
tried to follow Alex Stern's advice, but have not been able to cause a
stall manually.
So I don't know what to do next. Can someone with more expertise in
timers look into this?
Any hints or help in investigating or fixing this regression would be
greatly appreciated.
Thanks
Marcello
[1]:
https://lore.kernel.org/all/57a1c2180ff74661600e010c234d1dbaba1d0d46.1712843963.git.sylv@sylv.io/
[2]:
https://syzkaller.appspot.com/bug?id=e2befc3f5c24e08345751880365468ef18fd8dc5
[3]: https://syzkaller.appspot.com/bug?extid=5127feb52165f8ab165b
[4]:
https://lore.kernel.org/oe-lkp/202406141323.413a90d2-lkp@intel.com/
[5]:
https://github.com/google/syzkaller/blob/master/docs/syzbot_assets.md
On Tue, 2024-06-04 at 14:05 +0200, Marcello Sylvester Bauer wrote:
> Greetings,
>
> I'm currently investigating this regression to properly fix it. My
> patch only replaces the corresponding timer API calls without
> actually
> changing the code. I'm trying to get it to work properly with the
> hrtimer API.
>
> Any hints on how to accomplish this are welcome.
>
> Thanks
> Marcello
>
> On Thu, 2024-05-16 at 15:01 -0700, syzbot wrote:
> > syzbot has bisected this issue to:
> >
> > commit a7f3813e589fd8e2834720829a47b5eb914a9afe
> > Author: Marcello Sylvester Bauer <sylv@sylv.io>
> > Date: Thu Apr 11 14:51:28 2024 +0000
> >
> > usb: gadget: dummy_hcd: Switch to hrtimer transfer scheduler
> >
> > bisection log:
> > https://syzkaller.appspot.com/x/bisect.txt?x=119318d0980000
> > start commit: 75fa778d74b7 Add linux-next specific files for
> > 20240510
> > git tree: linux-next
> > final oops:
> > https://syzkaller.appspot.com/x/report.txt?x=139318d0980000
> > console output:
> > https://syzkaller.appspot.com/x/log.txt?x=159318d0980000
> > kernel config:
> > https://syzkaller.appspot.com/x/.config?x=ccdd3ebd6715749a
> > dashboard link:
> > https://syzkaller.appspot.com/bug?extid=c793a7eca38803212c61
> > syz repro:
> > https://syzkaller.appspot.com/x/repro.syz?x=16dcd598980000
> > C reproducer:
> > https://syzkaller.appspot.com/x/repro.c?x=151d9c78980000
> >
> > Reported-by: syzbot+c793a7eca38803212c61@syzkaller.appspotmail.com
> > Fixes: a7f3813e589f ("usb: gadget: dummy_hcd: Switch to hrtimer
> > transfer scheduler")
> >
> > For information about bisection process see:
> > https://goo.gl/tpsmEJ#bisection
>
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Needed help: dummy_hcd: Fix stalls/inconsistent_lock_state due to hrtimer migration
2024-06-24 10:25 ` Needed help: dummy_hcd: Fix stalls/inconsistent_lock_state due to hrtimer migration Marcello Sylvester Bauer
@ 2024-06-24 13:19 ` Thomas Gleixner
0 siblings, 0 replies; 6+ messages in thread
From: Thomas Gleixner @ 2024-06-24 13:19 UTC (permalink / raw)
To: Marcello Sylvester Bauer, linux-kernel, linux-usb, x86,
syzbot+c793a7eca38803212c61, syzbot+5127feb52165f8ab165b, oe-lkp,
bp, dave.hansen, syzkaller-bugs
Cc: Anna-Maria Behnsen, Frederic Weisbecker, Uwe Kleine-Koenig,
gregkh, hpa, mingo, stern, Alan Stern, Matthias Stoeckl
On Mon, Jun 24 2024 at 12:25, Marcello Sylvester Bauer wrote:
> I need some help evaluating and fixing a regression due to migration to
> hztimer scheduler in dummy_hcd.
>
> About two months ago I was investigating poor performance for the mass
> storage gadget (g_mass_storage) due to slow timings in the loopback hcd
> driver (dummy_hcd). One of the reasons was that dummy_hcd used the old
> timer API, where the interval is tied to the internal kernel timer
> frequency. So I submitted the patch to migrate to the hrtimer API[^1],
> which was quickly approved.
>
> Since then, syzbot[^2][^3] and intel's kernel test bot[^4] are
> detecting rcu stalls/inconsistent_lock_state due to my patch, and I'm
> trying to figure out how to fix it.
>
> Both bots indicate that the problem is around the usb_hcd_giveback_urb
> function call and it's locking mechanism.
>
> My patch just replaces the timer API calls without changing anything
> else in the code, so I'm not sure if my patch is actually the root
> cause here. And following the instructions to reproduce syzbot
> regressions[^5] even with the provided assets (bzImage, disk image,
> repro.c) it is quite inconsistent to cause this stall. I have also
> tried to follow Alex Stern's advice, but have not been able to cause a
> stall manually.
>
> So I don't know what to do next. Can someone with more expertise in
> timers look into this?
> Any hints or help in investigating or fixing this regression would be
> greatly appreciated.
The main difference between the timer list timer and the hrtimer is that
the timer list timer callback runs in soft interrupt context, but the
hrtimer callback runs in hard interrupt context.
I really don't know whether it matters, but you can make the hrtimer
expire in soft interrupt context with HRTIMER_MODE_REL_SOFT instead of
HRTIMER_MODE_REL. If you have a reproducer then that should tell you
quickly.
Thanks,
tglx
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2024-06-24 13:19 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2024-05-16 19:17 [syzbot] [usb?] INFO: rcu detected stall in schedule_timeout (6) syzbot
2024-05-16 22:01 ` syzbot
2024-06-04 12:05 ` Marcello Sylvester Bauer
2024-06-04 14:20 ` Alan Stern
2024-06-24 10:25 ` Needed help: dummy_hcd: Fix stalls/inconsistent_lock_state due to hrtimer migration Marcello Sylvester Bauer
2024-06-24 13:19 ` Thomas Gleixner
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