syzbot


INFO: task hung in blk_trace_startstop

Status: upstream: reported syz repro on 2025/11/11 16:43
Subsystems: block trace
[Documentation on labels]
Reported-by: syzbot+774863666ef5b025c9d0@syzkaller.appspotmail.com
First crash: 357d, last: 2h06m
Cause bisection: failed (error log, bisect log)
  
Discussions (2)
Title Replies (including bot) Last reply
[syzbot] [block?] [trace?] INFO: task hung in blk_trace_startstop 0 (2) 2026/02/15 14:17
[syzbot] Monthly trace report (Nov 2025) 0 (1) 2025/11/21 12:34
Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 INFO: task hung in blk_trace_startstop 1 2 1398d 1400d 0/1 auto-closed as invalid on 2022/08/16 23:57

Sample crash report:
INFO: task syz.3.20:6102 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.20        state:D stack:28368 pid:6102  tgid:6087  ppid:5957   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5295 [inline]
 __schedule+0x1585/0x5340 kernel/sched/core.c:6907
 __schedule_loop kernel/sched/core.c:6989 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7004
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7061
 __mutex_lock_common kernel/locking/mutex.c:692 [inline]
 __mutex_lock+0x7fe/0x1300 kernel/locking/mutex.c:776
 blk_trace_startstop+0x8f/0x610 kernel/trace/blktrace.c:901
 blk_trace_ioctl+0x315/0x740 kernel/trace/blktrace.c:947
 blkdev_common_ioctl+0x13a7/0x3250 block/ioctl.c:724
 blkdev_ioctl+0x528/0x740 block/ioctl.c:798
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f530c39bf79
RSP: 002b:00007f530d2e4028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f530c616180 RCX: 00007f530c39bf79
RDX: 0000000000000000 RSI: 0000000000001275 RDI: 0000000000000007
RBP: 00007f530c4327e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f530c616218 R14: 00007f530c616180 R15: 00007ffdd027c568
 </TASK>
INFO: task syz.2.19:6109 blocked for more than 150 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.19        state:D stack:26720 pid:6109  tgid:6091  ppid:5955   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5295 [inline]
 __schedule+0x1585/0x5340 kernel/sched/core.c:6907
 __schedule_loop kernel/sched/core.c:6989 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7004
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7061
 __mutex_lock_common kernel/locking/mutex.c:692 [inline]
 __mutex_lock+0x7fe/0x1300 kernel/locking/mutex.c:776
 relay_open+0x3b8/0x920 kernel/relay.c:516
 blk_trace_setup_prepare+0x425/0x5a0 kernel/trace/blktrace.c:716
 blk_trace_setup+0x2c0/0x430 kernel/trace/blktrace.c:789
 blk_trace_ioctl+0x380/0x740 kernel/trace/blktrace.c:935

Crashes (37):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/02/15 14:16 linux-next 635c467cc14e 1e62d198 .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci-upstream-linux-next-kasan-gce-root INFO: task hung in blk_trace_startstop
2026/02/15 10:09 upstream ca4ee40bf13d 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: task hung in blk_trace_startstop
2026/01/22 21:21 upstream a66191c590b3 2367ed1e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: task hung in blk_trace_startstop
2026/01/07 08:18 upstream f0b9d8eb98df d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in blk_trace_startstop
2025/12/01 07:53 upstream e69c7c175115 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: task hung in blk_trace_startstop
2025/11/07 16:36 upstream 4a0c9b339199 4e1406b4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: task hung in blk_trace_startstop
2025/10/29 07:30 upstream 8eefed8f65cc fd2207e7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in blk_trace_startstop
2025/10/18 22:47 upstream f406055cb18c 1c8c8cd8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in blk_trace_startstop
2025/10/05 11:25 upstream d104e3d17f7b 49379ee0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: task hung in blk_trace_startstop
2025/10/05 02:26 upstream d104e3d17f7b 49379ee0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in blk_trace_startstop
2025/09/16 09:53 upstream 46a51f4f5eda e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in blk_trace_startstop
2025/09/05 23:33 upstream c8ed9b5c02a5 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in blk_trace_startstop
2025/08/30 10:07 upstream fb679c832b64 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: task hung in blk_trace_startstop
2025/08/19 19:12 upstream 038d61fd6422 523f460e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in blk_trace_startstop
2025/08/01 18:39 upstream 89748acdf226 40127d41 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: task hung in blk_trace_startstop
2025/07/24 22:11 upstream 25fae0b93d1d fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: task hung in blk_trace_startstop
2025/07/14 18:40 upstream 347e9f5043c8 03fcfc4b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: task hung in blk_trace_startstop
2025/07/06 07:53 upstream 05df91921da6 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in blk_trace_startstop
2025/06/22 11:38 upstream 739a6c93cc75 d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: task hung in blk_trace_startstop
2025/06/21 23:53 upstream 3f75bfff44be d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in blk_trace_startstop
2025/06/19 09:55 upstream fb4d33ab452e ed3e87f7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in blk_trace_startstop
2025/06/16 04:42 upstream 08215f5486ec 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in blk_trace_startstop
2025/06/15 09:27 upstream 8c6bc74c7f89 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: task hung in blk_trace_startstop
2025/05/30 08:12 upstream e0797d3b91de 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in blk_trace_startstop
2025/03/28 05:10 upstream 1a9239bb4253 6c09fb82 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in blk_trace_startstop
2025/03/25 17:02 upstream 3ba7dfb8da62 875573af .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in blk_trace_startstop
2025/03/12 10:46 upstream 0fed89a961ea ee70e6db .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in blk_trace_startstop
2025/03/09 20:15 upstream 1110ce6a1e34 163f510d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in blk_trace_startstop
2025/03/09 06:06 upstream 2a520073e74f 163f510d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in blk_trace_startstop
2025/02/24 12:00 upstream d082ecbc71e9 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in blk_trace_startstop
2025/02/23 06:01 upstream 5cf80612d3f7 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in blk_trace_startstop
2025/07/27 21:20 upstream ec2df4364666 fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 INFO: task hung in blk_trace_startstop
2025/05/19 08:45 upstream a5806cd506af f41472b0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 INFO: task hung in blk_trace_startstop
2026/02/15 10:32 linux-next 635c467cc14e 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in blk_trace_startstop
2025/12/29 23:30 linux-next cc3aa43b44bd d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce INFO: task hung in blk_trace_startstop
2025/10/05 19:04 linux-next 47a8d4b89844 49379ee0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in blk_trace_startstop
2025/10/01 21:39 linux-next 3b9b1f8df454 a1859138 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in blk_trace_startstop
* Struck through repros no longer work on HEAD.