* [syzbot] [serial?] BUG: soft lockup in debug_check_no_obj_freed
@ 2024-10-19 15:37 syzbot
2024-10-27 9:33 ` Thomas Gleixner
0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2024-10-19 15:37 UTC (permalink / raw)
To: brauner, gregkh, jack, linux-fsdevel, linux-kernel, linux-serial,
linux-usb, syzkaller-bugs, viro
Hello,
syzbot found the following issue on:
HEAD commit: 07b887f8236e xhci: add helper to stop endpoint and wait fo..
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
console output: https://syzkaller.appspot.com/x/log.txt?x=1101fc5f980000
kernel config: https://syzkaller.appspot.com/x/.config?x=9878fe11046ea2c6
dashboard link: https://syzkaller.appspot.com/bug?extid=a234c2d63e0c171ca10e
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13e64430580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/c447438ae517/disk-07b887f8.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/1430abb44ca1/vmlinux-07b887f8.xz
kernel image: https://storage.googleapis.com/syzbot-assets/53e62be3705b/bzImage-07b887f8.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a234c2d63e0c171ca10e@syzkaller.appspotmail.com
rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: {
0-...D
} 2645 jiffies s: 773 root: 0x1/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5465 Comm: udevd Not tainted 6.12.0-rc3-syzkaller-00051-g07b887f8236e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:io_serial_in+0x87/0xb0 drivers/tty/serial/8250/8250_port.c:407
Code: 72 b5 fe 48 8d 7d 40 44 89 e1 48 b8 00 00 00 00 00 fc ff df 48 89 fa d3 e3 48 c1 ea 03 80 3c 02 00 75 1a 66 03 5d 40 89 da ec <5b> 0f b6 c0 5d 41 5c c3 cc cc cc cc e8 f8 ee 0d ff eb a2 e8 81 ef
RSP: 0018:ffffc90000006f08 EFLAGS: 00000002
RAX: dffffc0000000060 RBX: 00000000000003fd RCX: 0000000000000000
RDX: 00000000000003fd RSI: ffffffff82a06c30 RDI: ffffffff93635660
RBP: ffffffff93635620 R08: 0000000000000001 R09: 000000000000001f
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000020 R14: fffffbfff26c6b1e R15: dffffc0000000000
FS: 00007fefb97f9c80(0000) GS:ffff8881f5800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2dd5ffff CR3: 000000011c53e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<NMI>
</NMI>
<IRQ>
serial_in drivers/tty/serial/8250/8250.h:137 [inline]
serial_lsr_in drivers/tty/serial/8250/8250.h:159 [inline]
wait_for_lsr+0xda/0x180 drivers/tty/serial/8250/8250_port.c:2068
serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3315 [inline]
serial8250_console_write+0xf5a/0x17c0 drivers/tty/serial/8250/8250_port.c:3393
console_emit_next_record kernel/printk/printk.c:3092 [inline]
console_flush_all+0x800/0xc60 kernel/printk/printk.c:3180
__console_flush_and_unlock kernel/printk/printk.c:3239 [inline]
console_unlock+0xd9/0x210 kernel/printk/printk.c:3279
vprintk_emit+0x424/0x6f0 kernel/printk/printk.c:2407
vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:68
_printk+0xc8/0x100 kernel/printk/printk.c:2432
printk_stack_address arch/x86/kernel/dumpstack.c:72 [inline]
show_trace_log_lvl+0x1b7/0x3d0 arch/x86/kernel/dumpstack.c:285
sched_show_task kernel/sched/core.c:7589 [inline]
sched_show_task+0x3f0/0x5f0 kernel/sched/core.c:7564
show_state_filter+0xee/0x320 kernel/sched/core.c:7634
k_spec drivers/tty/vt/keyboard.c:667 [inline]
k_spec+0xed/0x150 drivers/tty/vt/keyboard.c:656
kbd_keycode drivers/tty/vt/keyboard.c:1522 [inline]
kbd_event+0xcbd/0x17a0 drivers/tty/vt/keyboard.c:1541
input_handler_events_default+0x116/0x1b0 drivers/input/input.c:2549
input_pass_values+0x777/0x8e0 drivers/input/input.c:126
input_event_dispose drivers/input/input.c:352 [inline]
input_handle_event+0xb30/0x14d0 drivers/input/input.c:369
input_event drivers/input/input.c:398 [inline]
input_event+0x83/0xa0 drivers/input/input.c:390
hidinput_hid_event+0xa12/0x2410 drivers/hid/hid-input.c:1719
hid_process_event+0x4b7/0x5e0 drivers/hid/hid-core.c:1540
hid_input_array_field+0x535/0x710 drivers/hid/hid-core.c:1652
hid_process_report drivers/hid/hid-core.c:1694 [inline]
hid_report_raw_event+0xa02/0x11c0 drivers/hid/hid-core.c:2040
__hid_input_report.constprop.0+0x341/0x440 drivers/hid/hid-core.c:2110
hid_irq_in+0x35e/0x870 drivers/hid/usbhid/hid-core.c:285
__usb_hcd_giveback_urb+0x389/0x6e0 drivers/usb/core/hcd.c:1650
usb_hcd_giveback_urb+0x396/0x450 drivers/usb/core/hcd.c:1734
dummy_timer+0x17c3/0x38d0 drivers/usb/gadget/udc/dummy_hcd.c:1988
__run_hrtimer kernel/time/hrtimer.c:1691 [inline]
__hrtimer_run_queues+0x20a/0xae0 kernel/time/hrtimer.c:1755
hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1772
handle_softirqs+0x206/0x8d0 kernel/softirq.c:554
__do_softirq kernel/softirq.c:588 [inline]
invoke_softirq kernel/softirq.c:428 [inline]
__irq_exit_rcu kernel/softirq.c:637 [inline]
irq_exit_rcu+0xac/0x110 kernel/softirq.c:649
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1037 [inline]
sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1037
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 76 80 42 fa 48 89 df e8 8e fd 42 fa f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 <bf> 01 00 00 00 e8 d5 3f 37 fa 65 8b 05 b6 fd 12 79 85 c0 74 16 5b
RSP: 0018:ffffc90001abfbd8 EFLAGS: 00000246
RAX: 0000000000000002 RBX: ffffffff935bf3e0 RCX: 1ffffffff14ac291
RDX: 0000000000000000 RSI: ffffffff8727f1c0 RDI: ffffffff8746ea80
RBP: 0000000000000286 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8a564d8f R11: 0000000000000000 R12: ffffffff935bf3d8
R13: 0000000000000000 R14: 0000000000000000 R15: ffff888102e9c000
__debug_check_no_obj_freed lib/debugobjects.c:998 [inline]
debug_check_no_obj_freed+0x328/0x600 lib/debugobjects.c:1019
slab_free_hook mm/slub.c:2273 [inline]
slab_free mm/slub.c:4579 [inline]
kfree+0x294/0x480 mm/slub.c:4727
do_delayed_call include/linux/delayed_call.h:28 [inline]
vfs_readlink+0x149/0x380 fs/namei.c:5272
do_readlinkat+0x24c/0x390 fs/stat.c:551
__do_sys_readlink fs/stat.c:574 [inline]
__se_sys_readlink fs/stat.c:571 [inline]
__x64_sys_readlink+0x78/0xc0 fs/stat.c:571
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fefb9925d47
Code: 73 01 c3 48 8b 0d e1 90 0d 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 59 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d b1 90 0d 00 f7 d8 64 89 01 48
RSP: 002b:00007ffee0fa4b98 EFLAGS: 00000206 ORIG_RAX: 0000000000000059
RAX: ffffffffffffffda RBX: 00000000000000ff RCX: 00007fefb9925d47
RDX: 0000000000000400 RSI: 00007ffee0fa4fa8 RDI: 00007ffee0fa4ba8
RBP: 00007ffee0fa53e8 R08: 0000562cf15ca1fd R09: 0000000000000000
R10: 0000000000000010 R11: 0000000000000206 R12: 0000000000000200
R13: 00007ffee0fa4fa8 R14: 00007ffee0fa4ba8 R15: 00007ffee0fa5aa9
</TASK>
</TASK>
task:kworker/u8:6 state:R running task stack:32568 pid:6065 tgid:6065 ppid:282 flags:0x00004000
Call Trace:
<TASK>
__switch_to_asm+0x70/0x70
</TASK>
task:modprobe state:R running task stack:25408 pid:6080 tgid:6080 ppid:243 flags:0x00000002
Call Trace:
<TASK>
</TASK>
task:kworker/u8:7 state:R running task stack:32568 pid:6082 tgid:6082 ppid:1112 flags:0x00004000
Call Trace:
<TASK>
__switch_to_asm+0x70/0x70
</TASK>
task:modprobe state:R running task stack:25136 pid:6087 tgid:6087 ppid:243 flags:0x00000000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5322 [inline]
__schedule+0x105f/0x34b0 kernel/sched/core.c:6682
do_task_dead+0xd6/0x110 kernel/sched/core.c:6698
do_exit+0x1de7/0x2ce0 kernel/exit.c:990
do_group_exit+0xd3/0x2a0 kernel/exit.c:1088
__do_sys_exit_group kernel/exit.c:1099 [inline]
__se_sys_exit_group kernel/exit.c:1097 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1097
x64_sys_call+0x14a9/0x16a0 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f175529ea90
RSP: 002b:00007ffd1fc1f4a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f175538f860 RCX: 00007f175529ea90
RDX: 00000000000000e7 RSI: 000000000000003c RDI: 0000000000000001
RBP: 00007f175538f860 R08: 0000000000000001 R09: 8d0dcd55e87a9e27
R10: 00007ffd1fc1f360 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f1755393658 R15: 0000000000000001
</TASK>
task:modprobe state:R running task stack:24704 pid:6091 tgid:6091 ppid:1168 flags:0x00000000
Call Trace:
<TASK>
</TASK>
task:modprobe state:R running task stack:26016 pid:6097 tgid:6097 ppid:1168 flags:0x00000002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5322 [inline]
__schedule+0x105f/0x34b0 kernel/sched/core.c:6682
</TASK>
task:modprobe state:R running task stack:23984 pid:6100 tgid:6100 ppid:1168 flags:0x00000002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5322 [inline]
__schedule+0x105f/0x34b0 kernel/sched/core.c:6682
</TASK>
task:modprobe state:R running task stack:24704 pid:6105 tgid:6105 ppid:1168 flags:0x00000002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5322 [inline]
__schedule+0x105f/0x34b0 kernel/sched/core.c:6682
do_task_dead+0xd6/0x110 kernel/sched/core.c:6698
do_exit+0x1de7/0x2ce0 kernel/exit.c:990
do_group_exit+0xd3/0x2a0 kernel/exit.c:1088
__do_sys_exit_group kernel/exit.c:1099 [inline]
__se_sys_exit_group kernel/exit.c:1097 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1097
x64_sys_call+0x14a9/0x16a0 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f347a9efa90
RSP: 002b:00007ffe0433c488 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f347aae0860 RCX: 00007f347a9efa90
RDX: 00000000000000e7 RSI: 000000000000003c RDI: 0000000000000001
RBP: 00007f347aae0860 R08: 0000000000000001 R09: 1c55e6acb1b2b457
R10: 00007ffe0433c340 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f347aae4658 R15: 0000000000000001
</TASK>
task:modprobe state:R running task stack:25408 pid:6109 tgid:6109 ppid:243 flags:0x00000002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5322 [inline]
__schedule+0x105f/0x34b0 kernel/sched/core.c:6682
</TASK>
task:kworker/u8:3 state:R running task stack:32568 pid:6115 tgid:6115 ppid:46 flags:0x00004000
Call Trace:
<TASK>
</TASK>
task:modprobe state:R running task stack:25408 pid:6116 tgid:6116 ppid:243 flags:0x00000000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5322 [inline]
__schedule+0x105f/0x34b0 kernel/sched/core.c:6682
preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:6861
__cond_resched+0x1b/0x30 kernel/sched/core.c:7199
might_resched include/linux/kernel.h:73 [inline]
remove_vma+0x32/0x1a0 mm/vma.c:328
exit_mmap+0x4e0/0xb30 mm/mmap.c:1888
</TASK>
task:modprobe state:R running task stack:25408 pid:6119 tgid:6119 ppid:46 flags:0x00000000
Call Trace:
<TASK>
</TASK>
task:modprobe state:R running task stack:25408 pid:6124 tgid:6124 ppid:1168 flags:0x00004002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5322 [inline]
__schedule+0x105f/0x34b0 kernel/sched/core.c:6682
do_task_dead+0xd6/0x110 kernel/sched/core.c:6698
do_exit+0x1de7/0x2ce0 kernel/exit.c:990
do_group_exit+0xd3/0x2a0 kernel/exit.c:1088
__do_sys_exit_group kernel/exit.c:1099 [inline]
__se_sys_exit_group kernel/exit.c:1097 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1097
x64_sys_call+0x14a9/0x16a0 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb260c95a90
RSP: 002b:00007fffa19bd598 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fb260d86860 RCX: 00007fb260c95a90
RDX: 00000000000000e7 RSI: 000000000000003c RDI: 0000000000000001
RBP: 00007fb260d86860 R08: 0000000000000001 R09: c8beb5f7eefeb567
R10: 00007fffa19bd450 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fb260d8a658 R15: 0000000000000001
</TASK>
task:kworker/u8:3 state:R running task stack:28784 pid:6128 tgid:6128 ppid:46 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5322 [inline]
__schedule+0x105f/0x34b0 kernel/sched/core.c:6682
preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:6861
</TASK>
task:modprobe state:R running task stack:24416 pid:6135 tgid:6135 ppid:1168 flags:0x00000000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5322 [inline]
__schedule+0x105f/0x34b0 kernel/sched/core.c:6682
</TASK>
task:modprobe state:R running task stack:24720 pid:6142 tgid:6142 ppid:1168 flags:0x00000002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5322 [inline]
__schedule+0x105f/0x34b0 kernel/sched/core.c:6682
do_task_dead+0xd6/0x110 kernel/sched/core.c:6698
do_exit+0x1de7/0x2ce0 kernel/exit.c:990
do_group_exit+0xd3/0x2a0 kernel/exit.c:1088
__do_sys_exit_group kernel/exit.c:1099 [inline]
__se_sys_exit_group kernel/exit.c:1097 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1097
x64_sys_call+0x14a9/0x16a0 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7623e7aa90
RSP: 002b:00007ffc42b305a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f7623f6b860 RCX: 00007f7623e7aa90
RDX: 00000000000000e7 RSI: 000000000000003c RDI: 0000000000000001
RBP: 00007f7623f6b860 R08: 0000000000000001 R09: e2a4624ea37f7418
R10: 00007ffc42b30460 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f7623f6f658 R15: 0000000000000001
</TASK>
task:modprobe state:R running task stack:25408 pid:6147 tgid:6147 ppid:37 flags:0x00000002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5322 [inline]
__schedule+0x105f/0x34b0 kernel/sched/core.c:6682
do_task_dead+0xd6/0x110 kernel/sched/core.c:6698
do_exit+0x1de7/0x2ce0 kernel/exit.c:990
do_group_exit+0xd3/0x2a0 kernel/exit.c:1088
__do_sys_exit_group kernel/exit.c:1099 [inline]
__se_sys_exit_group kernel/exit.c:1097 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1097
x64_sys_call+0x14a9/0x16a0 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f09bda7aa90
RSP: 002b:00007ffcfb5d2bc8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f09bdb6b860 RCX: 00007f09bda7aa90
RDX: 00000000000000e7 RSI: 000000000000003c RDI: 0000000000000001
RBP: 00007f09bdb6b860 R08: 0000000000000001 R09: e9ee8b4e2d520c1d
R10: 00007ffcfb5d2a80 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f09bdb6f658 R15: 0000000000000001
</TASK>
task:modprobe state:R running task stack:24704 pid:6152 tgid:6152 ppid:1168 flags:0x00000002
Call Trace:
<TASK>
</TASK>
task:modprobe state:R running task stack:25408 pid:6155 tgid:6155 ppid:37 flags:0x00000002
Call Trace:
<TASK>
</TASK>
task:modprobe state:R running task stack:24704 pid:6162 tgid:6162 ppid:243 flags:0x00000002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5322 [inline]
__schedule+0x105f/0x34b0 kernel/sched/core.c:6682
do_task_dead+0xd6/0x110 kernel/sched/core.c:6698
do_exit+0x1de7/0x2ce0 kernel/exit.c:990
do_group_exit+0xd3/0x2a0 kernel/exit.c:1088
__do_sys_exit_group kernel/exit.c:1099 [inline]
__se_sys_exit_group kernel/exit.c:1097 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1097
x64_sys_call+0x14a9/0x16a0 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6ae101ca90
RSP: 002b:00007ffe8a140c58 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f6ae110d860 RCX: 00007f6ae101ca90
RDX: 00000000000000e7 RSI: 000000000000003c RDI: 0000000000000001
RBP: 00007f6ae110d860 R08: 0000000000000001 R09: 881cc29ae1fba195
R10: 00007ffe8a140b10 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f6ae1111658 R15: 0000000000000001
</TASK>
task:modprobe state:R running task stack:23984 pid:6164 tgid:6164 ppid:1168 flags:0x00000000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5322 [inline]
__schedule+0x105f/0x34b0 kernel/sched/core.c:6682
preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:6861
</TASK>
task:modprobe state:R running task stack:25408 pid:6172 tgid:6172 ppid:243 flags:0x00000002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5322 [inline]
__schedule+0x105f/0x34b0 kernel/sched/core.c:6682
do_task_dead+0xd6/0x110 kernel/sched/core.c:6698
do_exit+0x1de7/0x2ce0 kernel/exit.c:990
do_group_exit+0xd3/0x2a0 kernel/exit.c:1088
__do_sys_exit_group kernel/exit.c:1099 [inline]
__se_sys_exit_group kernel/exit.c:1097 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1097
x64_sys_call+0x14a9/0x16a0 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5ee9af4a90
RSP: 002b:00007ffc18c668c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f5ee9be5860 RCX: 00007f5ee9af4a90
RDX: 00000000000000e7 RSI: 000000000000003c RDI: 0000000000000001
RBP: 00007f5ee9be5860 R08: 0000000000000001 R09: 6ac5e88e10cb51a5
R10: 00007ffc18c66780 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f5ee9be9658 R15: 0000000000000001
</TASK>
task:modprobe state:R running task stack:24704 pid:6175 tgid:6175 ppid:46 flags:0x00000002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5322 [inline]
__schedule+0x105f/0x34b0 kernel/sched/core.c:6682
do_task_dead+0xd6/0x110 kernel/sched/core.c:6698
do_exit+0x1de7/0x2ce0 kernel/exit.c:990
do_group_exit+0xd3/0x2a0 kernel/exit.c:1088
__do_sys_exit_group kernel/exit.c:1099 [inline]
__se_sys_exit_group kernel/exit.c:1097 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1097
x64_sys_call+0x14a9/0x16a0 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbcf9197a90
RSP: 002b:00007ffeb25b2738 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fbcf9288860 RCX: 00007fbcf9197a90
RDX: 00000000000000e7 RSI: 000000000000003c RDI: 0000000000000001
RBP: 00007fbcf9288860 R08: 0000000000000001 R09: 203a0cb64f1957e4
R10: 00007ffeb25b25f0 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fbcf928c658 R15: 0000000000000001
</TASK>
task:modprobe state:R running task stack:24416 pid:6183 tgid:6183 ppid:243 flags:0x00000002
Call Trace:
<TASK>
</TASK>
task:modprobe state:R running task stack:24704 pid:6184 tgid:6184 ppid:1168 flags:0x00000002
Call Trace:
<TASK>
</TASK>
task:modprobe state:R running task stack:24704 pid:6186 tgid:6186 ppid:37 flags:0x00000002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5322 [inline]
__schedule+0x105f/0x34b0 kernel/sched/core.c:6682
do_task_dead+0xd6/0x110 kernel/sched/core.c:6698
do_exit+0x1de7/0x2ce0 kernel/exit.c:990
do_group_exit+0xd3/0x2a0 kernel/exit.c:1088
__do_sys_exit_group kernel/exit.c:1099 [inline]
__se_sys_exit_group kernel/exit.c:1097 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1097
x64_sys_call+0x14a9/0x16a0 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd04e702a90
RSP: 002b:00007ffc879c8398 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fd04e7f3860 RCX: 00007fd04e702a90
RDX: 00000000000000e7 RSI: 000000000000003c RDI: 0000000000000001
RBP: 00007fd04e7f3860 R08: 0000000000000001 R09: 03af5961ba57cc0e
R10: 00007ffc879c8250 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fd04e7f7658 R15: 0000000000000001
</TASK>
task:modprobe state:R running task stack:23984 pid:6187 tgid:6187 ppid:243 flags:0x00000002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5322 [inline]
__schedule+0x105f/0x34b0 kernel/sched/core.c:6682
do_task_dead+0xd6/0x110 kernel/sched/core.c:6698
do_exit+0x1de7/0x2ce0 kernel/exit.c:990
do_group_exit+0xd3/0x2a0 kernel/exit.c:1088
__do_sys_exit_group kernel/exit.c:1099 [inline]
__se_sys_exit_group kernel/exit.c:1097 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1097
x64_sys_call+0x14a9/0x16a0 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe935edaa90
RSP: 002b:00007ffcfdc96a28 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fe935fcb860 RCX: 00007fe935edaa90
RDX: 00000000000000e7 RSI: 000000000000003c RDI: 0000000000000001
RBP: 00007fe935fcb860 R08: 0000000000000001 R09: 2e026b9deafd7ace
R10: 00007ffcfdc968e0 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fe935fcf658 R15: 0000000000000001
</TASK>
task:kworker/u8:8 state:R running task stack:28784 pid:6196 tgid:6196 ppid:1168 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5322 [inline]
__schedule+0x105f/0x34b0 kernel/sched/core.c:6682
preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:6861
</TASK>
task:modprobe state:R running task stack:25136 pid:6200 tgid:6200 ppid:37 flags:0x00000002
Call Trace:
<TASK>
</TASK>
task:kworker/u8:2 state:R running task stack:32568 pid:6204 tgid:6204 ppid:37 flags:0x00004000
Call Trace:
<TASK>
</TASK>
task:modprobe state:R running task stack:24704 pid:6206 tgid:6206 ppid:1168 flags:0x00000002
Call Trace:
<TASK>
</TASK>
task:kworker/u8:3 state:R running task stack:32568 pid:6213 tgid:6213 ppid:46 flags:0x00004000
Call Trace:
<TASK>
</TASK>
task:kworker/u8:8 state:R running task stack:32568 pid:6224 tgid:6224 ppid:1168 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5322 [inline]
__schedule+0x105f/0x34b0 kernel/sched/core.c:6682
</TASK>
task:kworker/u8:5 state:R running task stack:32568 pid:6232 tgid:6232 ppid:243 flags:0x00004000
Call Trace:
<TASK>
__switch_to_asm+0x70/0x70
</TASK>
task:modprobe state:R running task stack:23984 pid:6233 tgid:6233 ppid:1112 flags:0x00000000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5322 [inline]
__schedule+0x105f/0x34b0 kernel/sched/core.c:6682
</TASK>
task:kworker/u8:5 state:R running task stack:32568 pid:6242 tgid:6242 ppid:243 flags:0x00004000
Call Trace:
<TASK>
</TASK>
task:modprobe state:R running task stack:25408 pid:6243 tgid:6243 ppid:46 flags:0x00000000
Call Trace:
<TASK>
</TASK>
task:modprobe state:R running task stack:25408 pid:6253 tgid:6253 ppid:1112 flags:0x00000000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5322 [inline]
__schedule+0x105f/0x34b0 kernel/sched/core.c:6682
</TASK>
task:modprobe state:R running task stack:25408 pid:6256 tgid:6256 ppid:243 flags:0x00000000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5322 [inline]
__schedule+0x105f/0x34b0 kernel/sched/core.c:6682
do_task_dead+0xd6/0x110 kernel/sched/core.c:6698
do_exit+0x1de7/0x2ce0 kernel/exit.c:990
do_group_exit+0xd3/0x2a0 kernel/exit.c:1088
__do_sys_exit_group kernel/exit.c:1099 [inline]
__se_sys_exit_group kernel/exit.c:1097 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1097
x64_sys_call+0x14a9/0x16a0 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1aa73c7a90
RSP: 002b:00007ffd822968f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f1aa74b8860 RCX: 00007f1aa73c7a90
RDX: 00000000000000e7 RSI: 000000000000003c RDI: 0000000000000001
RBP: 00007f1aa74b8860 R08: 0000000000000001 R09: 772b712b87a2229b
R10: 00007ffd822967b0 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f1aa74bc658 R15: 0000000000000001
</TASK>
task:modprobe state:R running task stack:24704 pid:6261 tgid:6261 ppid:1112 flags:0x00004002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5322 [inline]
__schedule+0x105f/0x34b0 kernel/sched/core.c:6682
do_task_dead+0xd6/0x110 kernel/sched/core.c:6698
do_exit+0x1de7/0x2ce0 kernel/exit.c:990
do_group_exit+0xd3/0x2a0 kernel/exit.c:1088
__do_sys_exit_group kernel/exit.c:1099 [inline]
__se_sys_exit_group kernel/exit.c:1097 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1097
x64_sys_call+0x14a9/0x16a0 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f24fe1afa90
RSP: 002b:00007fffa5d033a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f24fe2a0860 RCX: 00007f24fe1afa90
RDX: 00000000000000e7 RSI: 000000000000003c RDI: 0000000000000001
RBP: 00007f24fe2a0860 R08: 0000000000000001 R09: a3709c33888e2dfd
R10: 00007fffa5d03260 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f24fe2a4658 R15: 0000000000000001
</TASK>
task:kworker/u8:2 state:R running task stack:28784 pid:6264 tgid:6264 ppid:37 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5322 [inline]
__schedule+0x105f/0x34b0 kernel/sched/core.c:6682
preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:6861
__cond_resched+0x1b/0x30 kernel/sched/core.c:7199
_cond_resched include/linux/sched.h:2031 [inline]
stop_one_cpu+0x112/0x190 kernel/stop_machine.c:151
</TASK>
task:modprobe state:R running task stack:24416 pid:6273 tgid:6273 ppid:46 flags:0x00000002
Call Trace:
<TASK>
</TASK>
task:modprobe state:R running task stack:25408 pid:6282 tgid:6282 ppid:1168 flags:0x00000000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5322 [inline]
__schedule+0x105f/0x34b0 kernel/sched/core.c:6682
</TASK>
task:modprobe state:R running task stack:24704 pid:6285 tgid:6285 ppid:243 flags:0x00000002
Call Trace:
<TASK>
</TASK>
task:kworker/u8:8 state:R running task stack:32568 pid:6292 tgid:6292 ppid:1168 flags:0x00004000
Call Trace:
<TASK>
__switch_to_asm+0x70/0x70
</TASK>
task:modprobe state:R running task stack:25408 pid:6295 tgid:6295 ppid:243 flags:0x00000002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5322 [inline]
__schedule+0x105f/0x34b0 kernel/sched/core.c:6682
__do_sys_exit_group kernel/exit.c:1099 [inline]
__se_sys_exit_group kernel/exit.c:1097 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1097
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
</TASK>
task:modprobe state:R running task stack:25408 pid:6296 tgid:6296 ppid:37 flags:0x00000000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5322 [inline]
__schedule+0x105f/0x34b0 kernel/sched/core.c:6682
__do_sys_exit_group kernel/exit.c:1099 [inline]
__se_sys_exit_group kernel/exit.c:1097 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1097
</TASK>
task:modprobe state:R running task stack:25408 pid:6298 tgid:6298 ppid:243 flags:0x00000002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5322 [inline]
__schedule+0x105f/0x34b0 kernel/sched/core.c:6682
</TASK>
task:modprobe state:R running task stack:25408 pid:6300 tgid:6300 ppid:37 flags:0x00000002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5322 [inline]
__schedule+0x105f/0x34b0 kernel/sched/core.c:6682
do_task_dead+0xd6/0x110 kernel/sched/core.c:6698
do_exit+0x1de7/0x2ce0 kernel/exit.c:990
do_group_exit+0xd3/0x2a0 kernel/exit.c:1088
__do_sys_exit_group kernel/exit.c:1099 [inline]
__se_sys_exit_group kernel/exit.c:1097 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1097
x64_sys_call+0x14a9/0x16a0 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f19326fba90
RSP: 002b:00007ffc90dba708 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f19327ec860 RCX: 00007f19326fba90
RDX: 00000000000000e7 RSI: 000000000000003c RDI: 0000000000000001
RBP: 00007f19327ec860 R08: 0000000000000001 R09: 468f387cc50540c0
R10: 00007ffc90dba5c0 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f19327f0658 R15: 0000000000000001
</TASK>
task:modprobe state:R running task stack:25136 pid:6306 tgid:6306 ppid:243 flags:0x00000002
Call Trace:
<TASK>
</TASK>
task:modprobe state:R running task stack:25408 pid:6313 tgid:6313 ppid:243 flags:0x00000002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5322 [inline]
__schedule+0x105f/0x34b0 kernel/sched/core.c:6682
do_task_dead+0xd6/0x110 kernel/sched/core.c:6698
do_exit+0x1de7/0x2ce0 kernel/exit.c:990
do_group_exit+0xd3/0x2a0 kernel/exit.c:1088
__do_sys_exit_group kernel/exit.c:1099 [inline]
__se_sys_exit_group kernel/exit.c:1097 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1097
x64_sys_call+0x14a9/0x16a0 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5bdbbcfa90
RSP: 002b:00007ffc0f4a1fa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f5bdbcc0860 RCX: 00007f5bdbbcfa90
RDX: 00000000000000e7 RSI: 000000000000003c RDI: 0000000000000001
RBP: 00007f5bdbcc0860 R08: 0000000000000001 R09: 94314777406a5a21
R10: 00007ffc0f4a1e60 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f5bdbcc4658 R15: 0000000000000001
</TASK>
task:kworker/u8:2 state:R running task stack:32568 pid:6321 tgid:6321 ppid:37 flags:0x00004000
Call Trace:
<TASK>
__switch_to_asm+0x70/0x70
</TASK>
task:modprobe state:R running task stack:24704 pid:6322 tgid:6322 ppid:1168 flags:0x00000002
Call Trace:
<TASK>
</TASK>
task:modprobe state:R running task stack:25408 pid:6330 tgid:6330 ppid:1168 flags:0x00000002
Call Trace:
<TASK>
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
</TASK>
task:modprobe state:R running task stack:25408 pid:6336 tgid:6336 ppid:37 flags:0x00000002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5322 [inline]
__schedule+0x105f/0x34b0 kernel/sched/core.c:6682
__do_sys_exit_group kernel/exit.c:1099 [inline]
__se_sys_exit_group kernel/exit.c:1097 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1097
</TASK>
task:modprobe state:R running task stack:25408 pid:6340 tgid:6340 ppid:1168 flags:0x00000000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5322 [inline]
__schedule+0x105f/0x34b0 kernel/sched/core.c:6682
</TASK>
task:kworker/u8:2 state:R running task stack:32568 pid:6345 tgid:6345 ppid:37 flags:0x00004000
Call Trace:
<TASK>
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
task:modprobe state:R running task stack:24704 pid:6348 tgid:6348 ppid:1168 flags:0x00000000
Call Trace:
<TASK>
</TASK>
task:modprobe state:R running task stack:23984 pid:6352 tgid:6352 ppid:46 flags:0x00000002
Call Trace:
<TASK>
---
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] 2+ messages in thread
* Re: [syzbot] [serial?] BUG: soft lockup in debug_check_no_obj_freed
2024-10-19 15:37 [syzbot] [serial?] BUG: soft lockup in debug_check_no_obj_freed syzbot
@ 2024-10-27 9:33 ` Thomas Gleixner
0 siblings, 0 replies; 2+ messages in thread
From: Thomas Gleixner @ 2024-10-27 9:33 UTC (permalink / raw)
To: syzbot, brauner, gregkh, jack, linux-fsdevel, linux-kernel,
linux-serial, linux-usb, syzkaller-bugs, viro
On Sat, Oct 19 2024 at 08:37, syzbot wrote:
That's not a soft lockup in debug_check_no_obj_freed().
What actually happens is:
> serial_in drivers/tty/serial/8250/8250.h:137 [inline]
> serial_lsr_in drivers/tty/serial/8250/8250.h:159 [inline]
> wait_for_lsr+0xda/0x180 drivers/tty/serial/8250/8250_port.c:2068
> serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3315 [inline]
> serial8250_console_write+0xf5a/0x17c0 drivers/tty/serial/8250/8250_port.c:3393
> console_emit_next_record kernel/printk/printk.c:3092 [inline]
> console_flush_all+0x800/0xc60 kernel/printk/printk.c:3180
> __console_flush_and_unlock kernel/printk/printk.c:3239 [inline]
> console_unlock+0xd9/0x210 kernel/printk/printk.c:3279
> vprintk_emit+0x424/0x6f0 kernel/printk/printk.c:2407
> vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:68
> _printk+0xc8/0x100 kernel/printk/printk.c:2432
> printk_stack_address arch/x86/kernel/dumpstack.c:72 [inline]
> show_trace_log_lvl+0x1b7/0x3d0 arch/x86/kernel/dumpstack.c:285
> sched_show_task kernel/sched/core.c:7589 [inline]
> sched_show_task+0x3f0/0x5f0 kernel/sched/core.c:7564
> show_state_filter+0xee/0x320 kernel/sched/core.c:7634
> k_spec drivers/tty/vt/keyboard.c:667 [inline]
> k_spec+0xed/0x150 drivers/tty/vt/keyboard.c:656
HID injects a sysrq-t and the task dump takes ages, which is what stalls
RCU.
There is not much what can be done about this as the dump is initiated
from soft interrupt context at interrupt return.
Thanks,
tglx
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2024-10-27 9:33 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2024-10-19 15:37 [syzbot] [serial?] BUG: soft lockup in debug_check_no_obj_freed syzbot
2024-10-27 9:33 ` Thomas Gleixner
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).