| Date | Name | Commit | Repro | Result |
|---|---|---|---|---|
| 2025/10/06 | lts (merge base) | b0c51e95f54e | C | [report] INFO: task hung in do_truncate |
| 2025/10/06 | upstream (ToT) | 7a405dbb0f03 | C | Didn't crash |
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| Date | Name | Commit | Repro | Result |
|---|---|---|---|---|
| 2025/10/06 | lts (merge base) | b0c51e95f54e | C | [report] INFO: task hung in do_truncate |
| 2025/10/06 | upstream (ToT) | 7a405dbb0f03 | C | Didn't crash |
| Kernel | Title | Rank 🛈 | Repro | Cause bisect | Fix bisect | Count | Last | Reported | Patched | Status |
|---|---|---|---|---|---|---|---|---|---|---|
| linux-5.15 | INFO: task hung in do_truncate (3) | 1 | 12 | 285d | 458d | 0/3 | auto-obsoleted due to no activity on 2025/04/05 19:26 | |||
| upstream | INFO: task hung in do_truncate (3) f2fs | 1 | syz | error | 80 | 137d | 307d | 0/29 | auto-obsoleted due to no activity on 2025/08/02 00:14 | |
| linux-5.15 | INFO: task hung in do_truncate | 1 | 1 | 933d | 933d | 0/3 | auto-obsoleted due to no activity on 2023/07/17 23:13 | |||
| linux-5.15 | INFO: task hung in do_truncate (2) | 1 | 1 | 781d | 781d | 0/3 | auto-obsoleted due to no activity on 2023/11/27 08:00 | |||
| upstream | INFO: task hung in do_truncate (2) fs | 1 | C | done | done | 14 | 624d | 1945d | 0/29 | auto-obsoleted due to no activity on 2024/05/02 07:43 |
| upstream | INFO: task hung in do_truncate ext4 | 1 | C | 7 | 2518d | 2682d | 0/29 | closed as dup on 2018/09/08 15:38 |
INFO: task syz.2.17:385 blocked for more than 122 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.17 state:D stack:0 pid:385 tgid:383 ppid:370 flags:0x00000004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5945 [inline]
__schedule+0x1322/0x1df0 kernel/sched/core.c:7791
__schedule_loop kernel/sched/core.c:7872 [inline]
schedule+0xc6/0x240 kernel/sched/core.c:7887
schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:7944
rwsem_down_write_slowpath+0x9e8/0x1b90 kernel/locking/rwsem.c:1239
__down_write_common kernel/locking/rwsem.c:1383 [inline]
__down_write kernel/locking/rwsem.c:1392 [inline]
down_write+0x152/0x2a0 kernel/locking/rwsem.c:1659
inode_lock include/linux/fs.h:817 [inline]
do_truncate+0x187/0x220 fs/open.c:64
vfs_truncate+0x26e/0x320 fs/open.c:112
do_sys_truncate+0xdd/0x1a0 fs/open.c:135
__do_sys_truncate fs/open.c:147 [inline]
__se_sys_truncate fs/open.c:145 [inline]
__x64_sys_truncate+0x5f/0x70 fs/open.c:145
x64_sys_call+0x2698/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:77
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fdb8d38eec9
RSP: 002b:00007fdb8e282038 EFLAGS: 00000246 ORIG_RAX: 000000000000004c
RAX: ffffffffffffffda RBX: 00007fdb8d5e6090 RCX: 00007fdb8d38eec9
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000200000000340
RBP: 00007fdb8d411f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdb8d5e6128 R14: 00007fdb8d5e6090 R15: 00007fffbe1be428
</TASK>
INFO: task syz.3.18:402 blocked for more than 123 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.18 state:D stack:0 pid:402 tgid:398 ppid:388 flags:0x00000004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5945 [inline]
__schedule+0x1322/0x1df0 kernel/sched/core.c:7791
__schedule_loop kernel/sched/core.c:7872 [inline]
schedule+0xc6/0x240 kernel/sched/core.c:7887
schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:7944
rwsem_down_write_slowpath+0x9e8/0x1b90 kernel/locking/rwsem.c:1239
__down_write_common kernel/locking/rwsem.c:1383 [inline]
__down_write kernel/locking/rwsem.c:1392 [inline]
down_write+0x152/0x2a0 kernel/locking/rwsem.c:1659
inode_lock include/linux/fs.h:817 [inline]
do_truncate+0x187/0x220 fs/open.c:64
vfs_truncate+0x26e/0x320 fs/open.c:112
do_sys_truncate+0xdd/0x1a0 fs/open.c:135
__do_sys_truncate fs/open.c:147 [inline]
__se_sys_truncate fs/open.c:145 [inline]
__x64_sys_truncate+0x5f/0x70 fs/open.c:145
x64_sys_call+0x2698/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:77
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f74fd18eec9
RSP: 002b:00007f74fdfe7038 EFLAGS: 00000246 ORIG_RAX: 000000000000004c
RAX: ffffffffffffffda RBX: 00007f74fd3e6090 RCX: 00007f74fd18eec9
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000200000000340
RBP: 00007f74fd211f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f74fd3e6128 R14: 00007f74fd3e6090 R15: 00007ffc197322a8
</TASK>
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 68071847e78a8b5e73ab1b858b320f4e6b4f981b
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
<TASK>
__dump_stack+0x21/0x30 lib/dump_stack.c:94
dump_stack_lvl+0x10c/0x190 lib/dump_stack.c:120
dump_stack+0x19/0x20 lib/dump_stack.c:129
nmi_cpu_backtrace+0x2bf/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x142/0x2c0 lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:41
trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:267 [inline]
watchdog+0xd8f/0xed0 kernel/hung_task.c:423
kthread+0x2ca/0x370 kernel/kthread.c:389
ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 68071847e78a8b5e73ab1b858b320f4e6b4f981b
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:pv_native_safe_halt+0x17/0x20 arch/x86/kernel/paravirt.c:106
Code: cc cc cc b8 83 13 3d 28 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d c3 32 3a 00 f3 0f 1e fa 55 48 89 e5 fb f4 <5d> e9 d3 54 02 00 cc cc cc b8 00 00 00 00 90 90 90 90 90 90 90 90
RSP: 0018:ffffc900001a7e00 EFLAGS: 000002c2
RAX: ffff8881f6f00000 RBX: ffff88810366b900 RCX: ffffffff858d20be
RDX: 0000000000000001 RSI: 0000000000000004 RDI: 000000000004364c
RBP: ffffc900001a7e00 R08: ffff8881f6f39733 R09: 1ffff1103ede72e6
R10: dffffc0000000000 R11: ffffed103ede72e7 R12: 1ffff110206cd720
R13: 0000000000000001 R14: 0000000000000000 R15: ffffffff87cb1da8
FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff9b2562d58 CR3: 0000000126a4a000 CR4: 00000000003526b0
Call Trace:
<TASK>
arch_safe_halt arch/x86/include/asm/paravirt.h:112 [inline]
default_idle+0x17/0x30 arch/x86/kernel/process.c:754
arch_cpu_idle+0xd/0x20 arch/x86/kernel/process.c:791
default_idle_call+0x3f/0x80 kernel/sched/idle.c:117
cpuidle_idle_call kernel/sched/idle.c:185 [inline]
do_idle+0x1a0/0x470 kernel/sched/idle.c:326
cpu_startup_entry+0x48/0x70 kernel/sched/idle.c:424
start_secondary+0x12e/0x140 arch/x86/kernel/smpboot.c:314
common_startup_64+0x13b/0x157
</TASK>
| Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025/10/03 14:28 | android16-6.12 | 6a4218cc2885 | 49379ee0 | .config | console log | report | syz / log | C | [disk image] [vmlinux] [kernel image] | ci2-android-6-12-rust | INFO: task hung in do_truncate |