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INFO: task hung in iterate_supers

Status: upstream: reported C repro on 2018/07/10 10:30
Subsystems: 9p
[Documentation on labels]
Reported-by: syzbot+2349f5067b1772c1d8a5@syzkaller.appspotmail.com
First crash: 2719d, last: 78d
Cause bisection: failed (error log, bisect log)
  
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Discussions (9)
Title Replies (including bot) Last reply
[syzbot] Monthly 9p report (Jul 2023) 0 (1) 2023/07/10 09:36
[syzbot] Monthly 9p report (Jun 2023) 0 (1) 2023/06/07 13:47
[syzbot] Monthly 9p report (May 2023) 0 (1) 2023/05/07 06:35
[syzbot] Monthly reiserfs report 0 (1) 2023/03/27 11:03
[syzbot] [ext4] Monthly Report 0 (1) 2023/03/24 15:59
INFO: task hung in iterate_supers 4 (5) 2022/08/11 06:53
Reminder: 18 open syzbot bugs in "fs/9p" subsystem 1 (1) 2019/07/24 01:46
Reminder: 18 open syzbot bugs in "fs/9p" subsystem 1 (1) 2019/07/02 06:29
[PATCH] fs: Add to super_blocks list after SB_BORN is set. 2 (2) 2018/07/13 12:00
▶ ▼ Similar bugs (13)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-6-12 INFO: task hung in iterate_supers origin:upstream 1 C 1359 17d 161d 0/1 premoderation: reported C repro on 2025/06/21 16:44
android-414 INFO: task hung in iterate_supers 1 1 2588d 2425d 0/1 auto-closed as invalid on 2019/04/28 09:45
linux-4.14 INFO: task hung in iterate_supers 1 16 1796d 2410d 0/1 auto-closed as invalid on 2021/04/29 12:11
linux-4.19 INFO: task hung in iterate_supers (2) 1 1 1998d 1998d 0/1 auto-closed as invalid on 2020/10/09 12:15
linux-5.15 INFO: task hung in iterate_supers origin:lts-only 1 C 349 18m 997d 0/3 upstream: reported C repro on 2023/03/08 18:22
linux-6.1 INFO: task hung in iterate_supers origin:upstream missing-backport 1 C 323 1h59m 995d 0/3 upstream: reported C repro on 2023/03/10 21:24
linux-4.14 INFO: task hung in iterate_supers (2) 1 1 1009d 1009d 0/1 upstream: reported on 2023/02/24 15:59
linux-4.19 INFO: task hung in iterate_supers 1 7 2130d 2317d 0/1 auto-closed as invalid on 2020/05/29 21:42
linux-4.19 INFO: task hung in iterate_supers (3) vfs reiserfs ntfs 1 syz 378 999d 1806d 0/1 upstream: reported syz repro on 2020/12/20 03:38
android-49 INFO: task hung in iterate_supers 1 19 2649d 2750d 0/3 auto-closed as invalid on 2019/02/25 14:49
linux-6.6 INFO: task hung in iterate_supers origin:upstream missing-backport 1 C done 28 4d04h 163d 0/2 upstream: reported C repro on 2025/06/20 00:37
android-414 INFO: task hung in iterate_supers (2) 1 1 2407d 2407d 0/1 auto-closed as invalid on 2019/10/25 08:49
upstream INFO: task can't die in iterate_supers (2) ceph fs 1 1 1630d 1626d 0/29 auto-closed as invalid on 2021/08/13 03:51
▶ ▼ Last patch testing requests (11)
Created Duration User Patch Repo Result
2025/11/21 21:49 25m retest repro upstream OK log
2025/10/29 16:15 23m retest repro linux-next report log
2025/10/29 05:01 24m retest repro upstream OK log
2025/10/29 05:01 1h20m retest repro upstream OK log
2025/10/29 05:01 59m retest repro upstream report log
2025/08/20 05:02 43m retest repro upstream report log
2025/08/20 03:16 15m retest repro linux-next report log
2025/08/20 01:15 19m retest repro upstream report log
2025/08/20 01:15 22m retest repro upstream report log
2025/08/20 01:15 25m retest repro upstream report log
2022/07/28 04:10 15m penguin-kernel@i-love.sakura.ne.jp patch upstream OK log
▶ ▼ Fix bisection attempts (4)
Created Duration User Patch Repo Result
2025/10/15 13:51 36m bisect fix upstream error job log
2025/09/12 18:11 2h36m bisect fix upstream OK (0) job log log
2025/07/28 16:31 4h27m bisect fix upstream OK (0) job log log
2025/06/28 08:06 2h31m bisect fix upstream OK (0) job log log

Sample crash report:
INFO: task syz-executor113:5303 blocked for more than 143 seconds.
      Not tainted 6.7.0-rc1-syzkaller-00125-g7475e51b8796 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor113 state:D stack:27376 pid:5303  tgid:5297  ppid:5060   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5376 [inline]
 __schedule+0xedb/0x5af0 kernel/sched/core.c:6688
 __schedule_loop kernel/sched/core.c:6763 [inline]
 schedule+0xe9/0x270 kernel/sched/core.c:6778
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6835
 rwsem_down_read_slowpath+0x61e/0xb20 kernel/locking/rwsem.c:1086
 __down_read_common kernel/locking/rwsem.c:1250 [inline]
 __down_read kernel/locking/rwsem.c:1263 [inline]
 down_read+0x120/0x330 kernel/locking/rwsem.c:1528
 __super_lock fs/super.c:58 [inline]
 super_lock+0x23c/0x380 fs/super.c:117
 super_lock_shared fs/super.c:146 [inline]
 iterate_supers+0xb9/0x230 fs/super.c:969
 ksys_sync+0x8a/0x150 fs/sync.c:102
 __do_sys_sync+0xe/0x20 fs/sync.c:113
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fddb32cb799
RSP: 002b:00007fddb328c218 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fddb33553e8 RCX: 00007fddb32cb799
RDX: ffffffffffffffb0 RSI: 0000000000000000 RDI: 0000000000000080
RBP: 00007fddb33553e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fddb332206c
R13: 00007fddb332203b R14: 0030656c69662f2e R15: 64663d736e617274
 </TASK>
INFO: task syz-executor113:5304 blocked for more than 143 seconds.
      Not tainted 6.7.0-rc1-syzkaller-00125-g7475e51b8796 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor113 state:D stack:27776 pid:5304  tgid:5298  ppid:5069   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5376 [inline]
 __schedule+0xedb/0x5af0 kernel/sched/core.c:6688
 __schedule_loop kernel/sched/core.c:6763 [inline]
 schedule+0xe9/0x270 kernel/sched/core.c:6778
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6835
 rwsem_down_read_slowpath+0x61e/0xb20 kernel/locking/rwsem.c:1086
 __down_read_common kernel/locking/rwsem.c:1250 [inline]
 __down_read kernel/locking/rwsem.c:1263 [inline]
 down_read+0x120/0x330 kernel/locking/rwsem.c:1528
 __super_lock fs/super.c:58 [inline]
 super_lock+0x23c/0x380 fs/super.c:117
 super_lock_shared fs/super.c:146 [inline]
 iterate_supers+0xb9/0x230 fs/super.c:969
 ksys_sync+0x8a/0x150 fs/sync.c:102
 __do_sys_sync+0xe/0x20 fs/sync.c:113
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fddb32cb799
RSP: 002b:00007fddb328c218 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fddb33553e8 RCX: 00007fddb32cb799
RDX: ffffffffffffffb0 RSI: 0000000000000000 RDI: 0000000000000080
RBP: 00007fddb33553e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fddb332206c
R13: 00007fddb332203b R14: 0030656c69662f2e R15: 64663d736e617274
 </TASK>
INFO: task syz-executor113:5308 blocked for more than 143 seconds.
      Not tainted 6.7.0-rc1-syzkaller-00125-g7475e51b8796 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor113 state:D stack:27568 pid:5308  tgid:5299  ppid:5065   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5376 [inline]
 __schedule+0xedb/0x5af0 kernel/sched/core.c:6688
 __schedule_loop kernel/sched/core.c:6763 [inline]
 schedule+0xe9/0x270 kernel/sched/core.c:6778
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6835
 rwsem_down_read_slowpath+0x61e/0xb20 kernel/locking/rwsem.c:1086
 __down_read_common kernel/locking/rwsem.c:1250 [inline]
 __down_read kernel/locking/rwsem.c:1263 [inline]
 down_read+0x120/0x330 kernel/locking/rwsem.c:1528
 __super_lock fs/super.c:58 [inline]
 super_lock+0x23c/0x380 fs/super.c:117
 super_lock_shared fs/super.c:146 [inline]
 iterate_supers+0xb9/0x230 fs/super.c:969
 ksys_sync+0x8a/0x150 fs/sync.c:102
 __do_sys_sync+0xe/0x20 fs/sync.c:113
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fddb32cb799
RSP: 002b:00007fddb328c218 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fddb33553e8 RCX: 00007fddb32cb799
RDX: 00007fddb32cb799 RSI: 00000000000f4240 RDI: 0000000000000081
RBP: 00007fddb33553e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fddb332206c
R13: 00007fddb332203b R14: 0030656c69662f2e R15: 64663d736e617274
 </TASK>
INFO: task syz-executor113:5310 blocked for more than 144 seconds.
      Not tainted 6.7.0-rc1-syzkaller-00125-g7475e51b8796 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor113 state:D stack:29856 pid:5310  tgid:5300  ppid:5061   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5376 [inline]
 __schedule+0xedb/0x5af0 kernel/sched/core.c:6688
 __schedule_loop kernel/sched/core.c:6763 [inline]
 schedule+0xe9/0x270 kernel/sched/core.c:6778
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6835
 rwsem_down_read_slowpath+0x61e/0xb20 kernel/locking/rwsem.c:1086
 __down_read_common kernel/locking/rwsem.c:1250 [inline]
 __down_read kernel/locking/rwsem.c:1263 [inline]
 down_read+0x120/0x330 kernel/locking/rwsem.c:1528
 __super_lock fs/super.c:58 [inline]
 super_lock+0x23c/0x380 fs/super.c:117
 super_lock_shared fs/super.c:146 [inline]
 iterate_supers+0xb9/0x230 fs/super.c:969
 ksys_sync+0x8a/0x150 fs/sync.c:102
 __do_sys_sync+0xe/0x20 fs/sync.c:113
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fddb32cb799
RSP: 002b:00007fddb326b218 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fddb33553f8 RCX: 00007fddb32cb799
RDX: 00007fddb32cb799 RSI: 0000000000000000 RDI: 0000000000000080
RBP: 00007fddb33553f0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fddb332206c
R13: 00007fddb332203b R14: 0030656c69662f2e R15: 64663d736e617274
 </TASK>
INFO: task syz-executor113:5307 blocked for more than 144 seconds.
      Not tainted 6.7.0-rc1-syzkaller-00125-g7475e51b8796 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor113 state:D stack:27072 pid:5307  tgid:5302  ppid:5068   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5376 [inline]
 __schedule+0xedb/0x5af0 kernel/sched/core.c:6688
 __schedule_loop kernel/sched/core.c:6763 [inline]
 schedule+0xe9/0x270 kernel/sched/core.c:6778
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6835
 rwsem_down_read_slowpath+0x61e/0xb20 kernel/locking/rwsem.c:1086
 __down_read_common kernel/locking/rwsem.c:1250 [inline]
 __down_read kernel/locking/rwsem.c:1263 [inline]
 down_read+0x120/0x330 kernel/locking/rwsem.c:1528
 __super_lock fs/super.c:58 [inline]
 super_lock+0x23c/0x380 fs/super.c:117
 super_lock_shared fs/super.c:146 [inline]
 iterate_supers+0xb9/0x230 fs/super.c:969
 ksys_sync+0x8a/0x150 fs/sync.c:102
 __do_sys_sync+0xe/0x20 fs/sync.c:113
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fddb32cb799
RSP: 002b:00007fddb328c218 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fddb33553e8 RCX: 00007fddb32cb799
RDX: ffffffffffffffb0 RSI: 0000000000000000 RDI: 0000000000000080
RBP: 00007fddb33553e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fddb332206c
R13: 00007fddb332203b R14: 0030656c69662f2e R15: 64663d736e617274
 </TASK>
INFO: task syz-executor113:5312 blocked for more than 144 seconds.
      Not tainted 6.7.0-rc1-syzkaller-00125-g7475e51b8796 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor113 state:D stack:29704 pid:5312  tgid:5301  ppid:5063   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5376 [inline]
 __schedule+0xedb/0x5af0 kernel/sched/core.c:6688
 __schedule_loop kernel/sched/core.c:6763 [inline]
 schedule+0xe9/0x270 kernel/sched/core.c:6778
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6835
 rwsem_down_read_slowpath+0x61e/0xb20 kernel/locking/rwsem.c:1086
 __down_read_common kernel/locking/rwsem.c:1250 [inline]
 __down_read kernel/locking/rwsem.c:1263 [inline]
 down_read+0x120/0x330 kernel/locking/rwsem.c:1528
 __super_lock fs/super.c:58 [inline]
 super_lock+0x23c/0x380 fs/super.c:117
 super_lock_shared fs/super.c:146 [inline]
 iterate_supers+0xb9/0x230 fs/super.c:969
 ksys_sync+0x8a/0x150 fs/sync.c:102
 __do_sys_sync+0xe/0x20 fs/sync.c:113
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fddb32cb799
RSP: 002b:00007fddb326b218 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fddb33553f8 RCX: 00007fddb32cb799
RDX: ffffffffffffffb0 RSI: 0000000000000000 RDI: 0000000000000080
RBP: 00007fddb33553f0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fddb332206c
R13: 00007fddb332203b R14: 0030656c69662f2e R15: 64663d736e617274
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/28:
 #0: ffffffff8cfa82a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
 #0: ffffffff8cfa82a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]
 #0: ffffffff8cfa82a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6613
2 locks held by getty/4811:
 #0: ffff8880281c20a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc900020582f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc6/0x1490 drivers/tty/n_tty.c:2201
1 lock held by syz-executor113/5303:
 #0: ffff88807dd280e0 (&type->s_umount_key#66){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff88807dd280e0 (&type->s_umount_key#66){.+.+}-{3:3}, at: super_lock+0x23c/0x380 fs/super.c:117
1 lock held by syz-executor113/5304:
 #0: ffff88807dd280e0 (&type->s_umount_key#66){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff88807dd280e0 (&type->s_umount_key#66){.+.+}-{3:3}, at: super_lock+0x23c/0x380 fs/super.c:117
1 lock held by syz-executor113/5308:
 #0: ffff88807dd280e0 (&type->s_umount_key#66){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff88807dd280e0 (&type->s_umount_key#66){.+.+}-{3:3}, at: super_lock+0x23c/0x380 fs/super.c:117
1 lock held by syz-executor113/5305:
 #0: ffff8880276de0e0 (&type->s_umount_key#60/1){+.+.}-{3:3}, at: alloc_super+0x238/0xb50 fs/super.c:352
1 lock held by syz-executor113/5310:
 #0: ffff88807dd280e0 (&type->s_umount_key#66){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff88807dd280e0 (&type->s_umount_key#66){.+.+}-{3:3}, at: super_lock+0x23c/0x380 fs/super.c:117
1 lock held by syz-executor113/5307:
 #0: ffff88807dd280e0 (&type->s_umount_key#66){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff88807dd280e0 (&type->s_umount_key#66){.+.+}-{3:3}, at: super_lock+0x23c/0x380 fs/super.c:117
1 lock held by syz-executor113/5306:
 #0: ffff88807dd280e0 (&type->s_umount_key#60/1){+.+.}-{3:3}, at: alloc_super+0x238/0xb50 fs/super.c:352
1 lock held by syz-executor113/5312:
 #0: ffff88807dd280e0 (&type->s_umount_key#66){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff88807dd280e0 (&type->s_umount_key#66){.+.+}-{3:3}, at: super_lock+0x23c/0x380 fs/super.c:117

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.7.0-rc1-syzkaller-00125-g7475e51b8796 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x277/0x390 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x299/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
 watchdog+0xf87/0x1210 kernel/hung_task.c:379
 kthread+0x2c6/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4498 Comm: klogd Not tainted 6.7.0-rc1-syzkaller-00125-g7475e51b8796 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:173 [inline]
RIP: 0010:write_comp_data+0x12/0x80 kernel/kcov.c:236
Code: 04 25 00 bd 03 00 48 8b 80 f0 15 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 49 89 d2 49 89 f8 49 89 f1 65 48 8b 14 25 00 bd 03 00 <65> 8b 05 af 3b 7d 7e a9 00 01 ff 00 74 0f f6 c4 01 74 59 8b 82 fc
RSP: 0018:ffffc9000344f490 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc9000344f518 RCX: ffffffff813a07bb
RDX: ffff88807c19c200 RSI: 0000000000000001 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000004 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000001
R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000001
FS:  00007fc8b4bbd380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b76619c600 CR3: 000000007c112000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 unwind_next_frame+0x117b/0x2390 arch/x86/kernel/unwind_orc.c:664
 arch_stack_walk+0xfa/0x170 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x96/0xd0 kernel/stacktrace.c:122
 kasan_save_stack+0x33/0x50 mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 mm/kasan/common.c:52
 __kasan_slab_alloc+0x81/0x90 mm/kasan/common.c:328
 kasan_slab_alloc include/linux/kasan.h:188 [inline]
 slab_post_alloc_hook mm/slab.h:763 [inline]
 slab_alloc_node mm/slab.c:3237 [inline]
 kmem_cache_alloc_node+0x173/0x4a0 mm/slab.c:3509
 __alloc_skb+0x287/0x330 net/core/skbuff.c:641
 alloc_skb include/linux/skbuff.h:1286 [inline]
 alloc_skb_with_frags+0xe4/0x710 net/core/skbuff.c:6331
 sock_alloc_send_pskb+0x7e4/0x970 net/core/sock.c:2780
 unix_dgram_sendmsg+0x464/0x1ca0 net/unix/af_unix.c:1976
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0xd5/0x180 net/socket.c:745
 __sys_sendto+0x255/0x340 net/socket.c:2190
 __do_sys_sendto net/socket.c:2202 [inline]
 __se_sys_sendto net/socket.c:2198 [inline]
 __x64_sys_sendto+0xe0/0x1b0 net/socket.c:2198
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fc8b4d1f9b5
Code: 8b 44 24 08 48 83 c4 28 48 98 c3 48 98 c3 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 26 45 31 c9 45 31 c0 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 7a 48 8b 15 44 c4 0c 00 f7 d8 64 89 02 48 83
RSP: 002b:00007fff1bc9b018 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc8b4d1f9b5
RDX: 000000000000008b RSI: 000055f978d454e0 RDI: 0000000000000003
RBP: 000055f978d3f2c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000004000 R11: 0000000000000246 R12: 0000000000000013
R13: 00007fc8b4ead212 R14: 00007fff1bc9b118 R15: 0000000000000000
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 2.096 msecs

Crashes (5804):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/11/17 05:37 upstream 7475e51b8796 cb976f63 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in iterate_supers
2022/10/30 22:49 upstream b229b6ca5abb 2a71366b .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in iterate_supers
2023/06/17 10:52 linux-next f7efed9f38f8 f3921d4d .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in iterate_supers
2025/05/27 07:21 upstream 0ff41df1cb26 874a1386 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in iterate_supers
2025/05/26 21:32 upstream 0ff41df1cb26 874a1386 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in iterate_supers
2025/05/26 19:28 upstream 0ff41df1cb26 874a1386 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2025/05/26 16:58 upstream 0ff41df1cb26 2d4582d0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in iterate_supers
2025/05/26 12:08 upstream 0f8c0258bf04 2d4582d0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in iterate_supers
2025/05/26 07:51 upstream 0f8c0258bf04 2d4582d0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in iterate_supers
2025/05/26 04:19 upstream 0f8c0258bf04 2d4582d0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in iterate_supers
2025/05/25 19:31 upstream d0c22de9995b 2d4582d0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2025/05/25 18:08 upstream d0c22de9995b ed351ea7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2025/05/25 16:06 upstream d0c22de9995b ed351ea7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in iterate_supers
2025/05/25 14:16 upstream d0c22de9995b ed351ea7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2025/05/25 13:12 upstream d0c22de9995b ed351ea7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2025/05/25 11:20 upstream d0c22de9995b ed351ea7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2025/05/25 08:06 upstream d0c22de9995b ed351ea7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2025/05/25 04:19 upstream b1427432d3b6 ed351ea7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in iterate_supers
2025/05/25 01:57 upstream b1427432d3b6 ed351ea7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2025/05/24 20:20 upstream b1427432d3b6 ed351ea7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in iterate_supers
2025/05/24 18:50 upstream b1427432d3b6 ed351ea7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2025/05/24 14:44 upstream 4856ebd99715 ed351ea7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2025/05/24 10:27 upstream 4856ebd99715 ed351ea7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2025/05/24 07:30 upstream 4856ebd99715 ed351ea7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2025/05/24 02:40 upstream eccf6f2f6ab9 f8cc0c83 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in iterate_supers
2025/05/24 02:08 upstream eccf6f2f6ab9 f8cc0c83 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in iterate_supers
2025/05/23 22:17 upstream eccf6f2f6ab9 f8cc0c83 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2025/05/23 21:06 upstream eccf6f2f6ab9 f8cc0c83 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in iterate_supers
2025/05/23 19:27 upstream eccf6f2f6ab9 f8cc0c83 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2025/05/23 18:23 upstream eccf6f2f6ab9 f8cc0c83 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2025/05/23 16:47 upstream eccf6f2f6ab9 f8cc0c83 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2025/05/23 11:17 upstream 94305e83eccb fa44301a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in iterate_supers
2025/05/23 05:57 upstream 94305e83eccb fa44301a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in iterate_supers
2025/05/23 05:51 upstream 94305e83eccb fa44301a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in iterate_supers
2025/05/23 03:27 upstream 94305e83eccb fa44301a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in iterate_supers
2025/05/22 18:03 upstream d608703fcdd9 0919b50b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in iterate_supers
2025/05/22 15:13 upstream d608703fcdd9 0919b50b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2025/05/22 08:44 upstream 4a95bc121ccd 0919b50b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in iterate_supers
2025/05/22 02:31 upstream d608703fcdd9 0919b50b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2025/05/22 00:11 upstream 4a95bc121ccd 0919b50b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in iterate_supers
2025/05/21 21:41 upstream 4a95bc121ccd b47f9e02 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in iterate_supers
2025/05/21 16:41 upstream 4a95bc121ccd dc5d3808 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2025/05/20 18:30 upstream a5806cd506af b47f9e02 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2025/05/20 17:10 upstream a5806cd506af 8f9cf946 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in iterate_supers
2025/05/20 15:56 upstream a5806cd506af 8f9cf946 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in iterate_supers
2025/05/20 14:42 upstream a5806cd506af b47f9e02 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2025/05/20 00:40 upstream a5806cd506af 8f9cf946 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in iterate_supers
2025/05/19 22:43 upstream a5806cd506af b84f0537 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2025/05/19 18:41 upstream a5806cd506af f41472b0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in iterate_supers
2025/05/19 15:33 upstream a5806cd506af f41472b0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in iterate_supers
2025/05/19 14:02 upstream a5806cd506af f41472b0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in iterate_supers
2025/01/05 17:35 upstream ab75170520d4 f3558dbf .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in iterate_supers
2024/11/25 20:45 upstream 9f16d5e6f220 a84878fc .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in iterate_supers
2024/11/11 02:13 upstream a9cda7c0ffed 6b856513 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in iterate_supers
2024/02/25 05:00 upstream f2e367d6ad3b 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: task hung in iterate_supers
2024/02/25 03:03 upstream f2e367d6ad3b 8d446f15 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-gce-smack-root INFO: task hung in iterate_supers
2023/10/28 10:00 upstream 888cf78c29e2 3c418d72 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-gce-root INFO: task hung in iterate_supers
2023/08/05 02:12 upstream e6fda526d9db cdae481e .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs INFO: task hung in iterate_supers
2024/02/23 07:33 upstream 1c892cdd8fe0 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 INFO: task hung in iterate_supers
2024/02/17 20:56 upstream ced590523156 578f7538 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64 INFO: task hung in iterate_supers
2025/04/07 01:16 linux-next a4cda136f021 1c65791e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in iterate_supers
2025/05/20 04:37 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a82e92598ab1 8f9cf946 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in iterate_supers
2020/12/27 18:23 upstream f838f8d2b694 2242f77f .config console log report info ci-upstream-kasan-gce-selinux-root
2018/06/21 06:34 upstream 1abd8a8f39cd 095ef806 .config console log report ci-upstream-kasan-gce-root
2018/07/10 04:07 linux-next d00d6d9a339d f25e5770 .config console log report syz C ci-upstream-linux-next-kasan-gce-root
* Struck through repros no longer work on HEAD.