Re: [syzbot] INFO: rcu detected stall in gc_worker (3)

syzbot
2022-03-21T06:43:16Z

BUG: soft lockup in smp_call_function

watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [kworker/u4:5:1244]
Modules linked in:
irq event stamp: 595274
hardirqs last enabled at (595273): [<ffffffff89600c02>] asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
hardirqs last disabled at (595274): [<ffffffff894c14ab>] sysvec_apic_timer_interrupt+0xb/0xc0 arch/x86/kernel/apic/apic.c:1097
softirqs last enabled at (588534): [<ffffffff81474343>] invoke_softirq kernel/softirq.c:432 [inline]
softirqs last enabled at (588534): [<ffffffff81474343>] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637
softirqs last disabled at (588525): [<ffffffff81474343>] invoke_softirq kernel/softirq.c:432 [inline]
softirqs last disabled at (588525): [<ffffffff81474343>] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637
CPU: 0 PID: 1244 Comm: kworker/u4:5 Not tainted 5.17.0-syzkaller-00083-gf443e374ae13-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:__sanitizer_cov_trace_pc+0x5c/0x60 kernel/kcov.c:210
Code: 82 80 15 00 00 83 f8 02 75 20 48 8b 8a 88 15 00 00 8b 92 84 15 00 00 48 8b 01 48 83 c0 01 48 39 c2 76 07 48 89 34 c1 48 89 01 <c3> 0f 1f 00 41 55 41 54 49 89 fc 55 48 bd eb 83 b5 80 46 86 c8 61
RSP: 0018:ffffc90005a3f9e8 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff8880b9d3fec0 RCX: 0000000000000000
RDX: ffff88801cf21d00 RSI: ffffffff816d3654 RDI: 0000000000000003
RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff816d367a R11: 0000000000000000 R12: ffffed10173a7fd9
R13: 0000000000000001 R14: ffff8880b9d3fec8 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe833fd960 CR3: 000000000b88e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
rep_nop arch/x86/include/asm/vdso/processor.h:13 [inline]
cpu_relax arch/x86/include/asm/vdso/processor.h:18 [inline]
csd_lock_wait kernel/smp.c:440 [inline]
smp_call_function_many_cond+0x4e4/0xc90 kernel/smp.c:969
on_each_cpu_cond_mask+0x56/0xa0 kernel/smp.c:1135
on_each_cpu include/linux/smp.h:71 [inline]
text_poke_sync arch/x86/kernel/alternative.c:1112 [inline]
text_poke_bp_batch+0x21d/0x6f0 arch/x86/kernel/alternative.c:1300
text_poke_flush arch/x86/kernel/alternative.c:1470 [inline]
text_poke_flush arch/x86/kernel/alternative.c:1467 [inline]
text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1477
arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146
jump_label_update+0x32f/0x410 kernel/jump_label.c:830
static_key_enable_cpuslocked+0x1b1/0x260 kernel/jump_label.c:177
static_key_enable+0x16/0x20 kernel/jump_label.c:190
toggle_allocation_gate mm/kfence/core.c:735 [inline]
toggle_allocation_gate+0x100/0x390 mm/kfence/core.c:727
process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307
worker_thread+0x657/0x1110 kernel/workqueue.c:2454
kthread+0x2e9/0x3a0 kernel/kthread.c:377
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4081 Comm: syz-executor201 Not tainted 5.17.0-syzkaller-00083-gf443e374ae13-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:_raw_spin_lock_irqsave+0x3/0x50 kernel/locking/spinlock.c:161
Code: 31 d2 31 f6 e8 fe 9b 0e f8 48 89 ef 58 5d e9 04 0f 0f f8 e8 bf 0a 30 f8 eb c9 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 41 54 55 <48> 89 fd 9c 41 5c fa 41 f7 c4 00 02 00 00 75 36 bf 01 00 00 00 e8
RSP: 0018:ffffc90000dc0d40 EFLAGS: 00000002
RAX: 0000000000001399 RBX: 0000000000058308 RCX: 0000000000000000
RDX: 61c8864680b583eb RSI: ffffffff89ae6860 RDI: ffffffff906f8610
RBP: ffffffff906f8608 R08: ffffffff906f8610 R09: 0000000000000001
R10: ffffffff81681c55 R11: 0000000000000000 R12: dffffc0000000000
R13: ffffffff89ae6860 R14: 1ffff920001b81ad R15: ffff888140782b40
FS: 0000555555b0b300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000600 CR3: 000000001e6c1000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
debug_object_deactivate lib/debugobjects.c:735 [inline]
debug_object_deactivate+0x101/0x300 lib/debugobjects.c:723
debug_hrtimer_deactivate kernel/time/hrtimer.c:425 [inline]
debug_deactivate kernel/time/hrtimer.c:481 [inline]
__run_hrtimer kernel/time/hrtimer.c:1653 [inline]
__hrtimer_run_queues+0x3f8/0xe50 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
__sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103
sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x38/0x70 kernel/locking/spinlock.c:194
Code: 74 24 10 e8 6a 92 0e f8 48 89 ef e8 c2 10 0f f8 81 e3 00 02 00 00 75 25 9c 58 f6 c4 02 75 2d 48 85 db 74 01 fb bf 01 00 00 00 <e8> 73 c8 01 f8 65 8b 05 9c 76 b3 76 85 c0 74 0a 5b 5d c3 e8 b0 04
RSP: 0018:ffffc9000289f1e8 EFLAGS: 00000206
RAX: 0000000000000012 RBX: 0000000000000200 RCX: 1ffffffff2001bce
RDX: 0000000000000000 RSI: 0000000000000202 RDI: 0000000000000001
RBP: ffff888140782ae8 R08: 0000000000000001 R09: ffffffff8ffc5a07
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000
R13: ffff888140782ae8 R14: 0000000000000246 R15: ffff888140782800
spin_unlock_irqrestore include/linux/spinlock.h:404 [inline]
taprio_change+0x2f0c/0x4050 net/sched/sch_taprio.c:1606
taprio_init+0x52e/0x670 net/sched/sch_taprio.c:1738
qdisc_create.constprop.0+0x44a/0x10f0 net/sched/sch_api.c:1253
tc_modify_qdisc+0x4c5/0x1a00 net/sched/sch_api.c:1660
rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5596
netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494
netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline]
netlink_unicast+0x539/0x7e0 net/netlink/af_netlink.c:1343
netlink_sendmsg+0x904/0xe00 net/netlink/af_netlink.c:1919
sock_sendmsg_nosec net/socket.c:705 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:725
____sys_sendmsg+0x6e8/0x810 net/socket.c:2413
___sys_sendmsg+0xf3/0x170 net/socket.c:2467
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2496
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f5f768be729
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 81 15 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe833c99c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f5f768be729
RDX: 0000000000000000 RSI: 00000000200007c0 RDI: 0000000000000004
RBP: 0000000000000000 R08: 00007ffe833c99f0 R09: 00007ffe833c99f0
R10: 00007ffe833c99f0 R11: 0000000000000246 R12: 00007ffe833c99ec
R13: 00007ffe833c9a00 R14: 00007ffe833c9a40 R15: 0000000000000000
</TASK>
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 80 15 00 00 83 f8 02 adcb $0x2,-0x77d0000(%rip) # 0xf8830007
7: 75 20 jne 0x29
9: 48 8b 8a 88 15 00 00 mov 0x1588(%rdx),%rcx
10: 8b 92 84 15 00 00 mov 0x1584(%rdx),%edx
16: 48 8b 01 mov (%rcx),%rax
19: 48 83 c0 01 add $0x1,%rax
1d: 48 39 c2 cmp %rax,%rdx
20: 76 07 jbe 0x29
22: 48 89 34 c1 mov %rsi,(%rcx,%rax,8)
26: 48 89 01 mov %rax,(%rcx)
* 29: c3 retq <-- trapping instruction
2a: 0f 1f 00 nopl (%rax)
2d: 41 55 push %r13
2f: 41 54 push %r12
31: 49 89 fc mov %rdi,%r12
34: 55 push %rbp
35: 48 bd eb 83 b5 80 46 movabs $0x61c8864680b583eb,%rbp
3c: 86 c8 61

Tested on:

commit: f443e374 Linux 5.17
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=157ae133700000
kernel config: https://syzkaller.appspot.com/x/.config?x=19ca6f72fd444749
dashboard link: https://syzkaller.appspot.com/bug?extid=eec403943a2a2455adaa
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
patch: https://syzkaller.appspot.com/x/patch.diff?x=15e78333700000