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INFO: task hung in iterate_supers

Status: premoderation: reported C repro on 2025/06/21 16:44
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+53026d8de9c01a44d38e@syzkaller.appspotmail.com
First crash: 80d, last: 2h48m
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2025/06/24 lts (merge base) e0e2f7824338 C [report] INFO: task hung in iterate_supers
2025/06/24 upstream (ToT) 78f4e737a53e C [report] INFO: task hung in __iterate_supers
▶ ▼ Similar bugs (13)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-414 INFO: task hung in iterate_supers 1 1 2507d 2344d 0/1 auto-closed as invalid on 2019/04/28 09:45
linux-4.14 INFO: task hung in iterate_supers 1 16 1715d 2329d 0/1 auto-closed as invalid on 2021/04/29 12:11
linux-4.19 INFO: task hung in iterate_supers (2) 1 1 1917d 1917d 0/1 auto-closed as invalid on 2020/10/09 12:15
upstream INFO: task hung in iterate_supers 9p 1 C error 5804 43d 2619d 0/29 upstream: reported C repro on 2018/07/10 10:30
linux-5.15 INFO: task hung in iterate_supers origin:lts-only 1 C 330 5h48m 916d 0/3 upstream: reported C repro on 2023/03/08 18:22
linux-6.1 INFO: task hung in iterate_supers origin:upstream 1 C 305 9d08h 914d 0/3 upstream: reported C repro on 2023/03/10 21:24
linux-4.14 INFO: task hung in iterate_supers (2) 1 1 928d 928d 0/1 upstream: reported on 2023/02/24 15:59
linux-4.19 INFO: task hung in iterate_supers 1 7 2049d 2236d 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 918d 1725d 0/1 upstream: reported syz repro on 2020/12/20 03:38
android-49 INFO: task hung in iterate_supers 1 19 2568d 2669d 0/3 auto-closed as invalid on 2019/02/25 14:49
linux-6.6 INFO: task hung in iterate_supers 1 C 12 20h05m 82d 0/2 upstream: reported C repro on 2025/06/20 00:37
android-414 INFO: task hung in iterate_supers (2) 1 1 2326d 2326d 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 1549d 1545d 0/29 auto-closed as invalid on 2021/08/13 03:51

Sample crash report:
INFO: task syz.2.17:384 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:384   tgid:381   ppid:371    flags:0x00004004
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
 super_lock+0x150/0x300 fs/super.c:115
 super_lock_shared fs/super.c:140 [inline]
 iterate_supers+0x8a/0x560 fs/super.c:934
 quota_sync_all fs/quota/quota.c:69 [inline]
 __do_sys_quotactl fs/quota/quota.c:938 [inline]
 __se_sys_quotactl+0x308/0x7d0 fs/quota/quota.c:917
 __x64_sys_quotactl+0x9f/0xc0 fs/quota/quota.c:917
 x64_sys_call+0x2818/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:180
 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: 0033:0x7f56a6b8ebe9
RSP: 002b:00007f56a79be038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f56a6dc6090 RCX: 00007f56a6b8ebe9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000102
RBP: 00007f56a6c11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f56a6dc6128 R14: 00007f56a6dc6090 R15: 00007ffe4e282ae8
 </TASK>
INFO: task syz.3.18:400 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:400   tgid:396   ppid:386    flags:0x00004004
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
 super_lock+0x150/0x300 fs/super.c:115
 super_lock_shared fs/super.c:140 [inline]
 iterate_supers+0x8a/0x560 fs/super.c:934
 quota_sync_all fs/quota/quota.c:69 [inline]
 __do_sys_quotactl fs/quota/quota.c:938 [inline]
 __se_sys_quotactl+0x308/0x7d0 fs/quota/quota.c:917
 __x64_sys_quotactl+0x9f/0xc0 fs/quota/quota.c:917
 x64_sys_call+0x2818/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:180
 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: 0033:0x7f095158ebe9
RSP: 002b:00007f0952412038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f09517c6090 RCX: 00007f095158ebe9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000102
RBP: 00007f0951611e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f09517c6128 R14: 00007f09517c6090 R15: 00007fffde07db48
 </TASK>
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 cbcc7fb1a3c48ec238a6a34dd578fa775d2dddba
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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+0x2c7/0x370 kernel/kthread.c:389
 ret_from_fork+0x64/0xa0 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 cbcc7fb1a3c48ec238a6a34dd578fa775d2dddba
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:attach_entity_load_avg+0x37e/0x750 kernel/sched/fair.c:4861
Code: 42 0f b6 04 20 84 c0 0f 85 74 02 00 00 41 01 1e 48 8b 45 90 42 80 3c 20 00 48 8b 5d 80 74 08 48 89 df e8 95 92 7d 00 48 8b 1b <4d> 8d b5 a8 00 00 00 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c
RSP: 0018:ffffc90000230998 EFLAGS: 00000046
RAX: 1ffff110204e1035 RBX: 0000000000000000 RCX: dffffc0000000000
RDX: 0000000000000062 RSI: ffff888102708188 RDI: ffff88810270819c
RBP: ffffc90000230a20 R08: 0000000000000000 R09: ffff8881f6f4fbc0
R10: 0000000000000000 R11: ffffffff815e0030 R12: dffffc0000000000
R13: ffff8881f6f4fbc0 R14: ffff8881f6f4fc58 R15: 0000000000000400
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f79cf028d58 CR3: 00000001254d6000 CR4: 00000000003526b0
Call Trace:
 <IRQ>
 update_load_avg+0xc7d/0x19a0 kernel/sched/fair.c:4938
 enqueue_entity+0x72/0xf90 kernel/sched/fair.c:5529
 enqueue_task_fair+0x3fb/0x17e0 kernel/sched/fair.c:7185
 enqueue_task+0x7dc/0x11f0 kernel/sched/core.c:2104
 __activate_task kernel/sched/core.c:2151 [inline]
 activate_task+0x38b/0x3d0 kernel/sched/core.c:2185
 ttwu_do_activate+0x154/0x630 kernel/sched/core.c:4209
 sched_ttwu_pending+0x1a4/0x3f0 kernel/sched/core.c:4320
 csd_do_func kernel/smp.c:134 [inline]
 __flush_smp_call_function_queue+0x915/0xc70 kernel/smp.c:587
 generic_smp_call_function_single_interrupt+0x17/0x20 kernel/smp.c:457
 __sysvec_call_function_single+0x28/0x230 arch/x86/kernel/smp.c:271
 instr_sysvec_call_function_single arch/x86/kernel/smp.c:266 [inline]
 sysvec_call_function_single+0x7a/0x90 arch/x86/kernel/smp.c:266
 </IRQ>
 <TASK>
 asm_sysvec_call_function_single+0x1f/0x30 arch/x86/include/asm/idtentry.h:709
RIP: 0010:pv_native_safe_halt+0x17/0x20 arch/x86/kernel/paravirt.c:106
Code: cc cc cc b8 c8 f8 7e 42 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 93 01 3b 00 f3 0f 1e fa 55 48 89 e5 fb f4 <5d> c3 cc cc cc cc cc cc cc b8 00 00 00 00 90 90 90 90 90 90 90 90
RSP: 0018:ffffc900001a7e00 EFLAGS: 000002c6
RAX: ffff8881f6f00000 RBX: ffff88810366df00 RCX: ffffffff858c50ae
RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000040eec
RBP: ffffc900001a7e00 R08: ffff8881f6f39733 R09: 1ffff1103ede72e6
R10: dffffc0000000000 R11: ffffed103ede72e7 R12: 1ffff110206cdbe0
R13: 0000000000000001 R14: 0000000000000000 R15: ffffffff87cb0b28
 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>

Crashes (418):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/09/06 03:56 android16-6.12 6904c5603852 d291dd2d .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/01 12:32 android16-6.12 2e5a4bace74a 807a3b61 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/08/11 06:25 android16-6.12 c46482c03ae9 32a0e5ed .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/06/23 03:07 android16-6.12 d9fd901baa98 d6cdfb8a .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/06/22 21:39 android16-6.12 d9fd901baa98 d6cdfb8a .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/06/22 17:48 android16-6.12 d9fd901baa98 d6cdfb8a .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/06/22 08:10 android16-6.12 d9fd901baa98 d6cdfb8a .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/10 10:39 android16-6.12 c3591bab34ed fdeaa69b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/10 06:52 android16-6.12 9a2a4b6ded6c fdeaa69b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/10 00:35 android16-6.12 9a2a4b6ded6c fdeaa69b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/09 21:44 android16-6.12 9a2a4b6ded6c d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/09 20:38 android16-6.12 9a2a4b6ded6c d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/09 11:25 android16-6.12 7471f5c09c55 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/09 10:02 android16-6.12 7471f5c09c55 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/09 08:10 android16-6.12 7471f5c09c55 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/09 06:34 android16-6.12 7471f5c09c55 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/09 05:03 android16-6.12 7471f5c09c55 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/08 20:44 android16-6.12 a54f6a7673c1 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/08 12:15 android16-6.12 ad3375325ca2 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/08 08:26 android16-6.12 ad3375325ca2 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/08 02:45 android16-6.12 ad3375325ca2 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/07 23:13 android16-6.12 ad3375325ca2 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/07 21:59 android16-6.12 ad3375325ca2 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/07 20:19 android16-6.12 ad3375325ca2 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/07 13:02 android16-6.12 ad3375325ca2 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/07 08:27 android16-6.12 ad3375325ca2 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/07 06:29 android16-6.12 ad3375325ca2 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/07 04:29 android16-6.12 ad3375325ca2 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/07 03:20 android16-6.12 ad3375325ca2 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/06 23:12 android16-6.12 ad3375325ca2 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/06 20:23 android16-6.12 ad3375325ca2 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/06 04:05 android16-6.12 6904c5603852 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/05 14:45 android16-6.12 c5058bfb5bf2 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/05 13:35 android16-6.12 c5058bfb5bf2 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/05 00:57 android16-6.12 3a1f856821c2 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/04 23:01 android16-6.12 3a1f856821c2 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/04 17:28 android16-6.12 3a1f856821c2 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/04 03:28 android16-6.12 f67a8c04c720 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/04 01:19 android16-6.12 f67a8c04c720 96a211bc .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/03 20:48 android16-6.12 53e4390f692f 96a211bc .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/03 17:52 android16-6.12 53e4390f692f 96a211bc .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/03 15:38 android16-6.12 53e4390f692f 96a211bc .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/03 07:00 android16-6.12 4ae522d0f966 96a211bc .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/02 23:04 android16-6.12 4ae522d0f966 96a211bc .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/02 14:09 android16-6.12 4ae522d0f966 96a211bc .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/02 09:22 android16-6.12 2e5a4bace74a 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/02 05:28 android16-6.12 2e5a4bace74a 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/01 20:36 android16-6.12 2e5a4bace74a 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/01 17:30 android16-6.12 2e5a4bace74a 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/09/01 06:38 android16-6.12 6879524e1c5a 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/08/31 22:18 android16-6.12 6879524e1c5a 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/08/31 09:36 android16-6.12 6879524e1c5a 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/08/30 16:56 android16-6.12 6879524e1c5a 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/08/30 12:21 android16-6.12 6879524e1c5a 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/08/30 06:45 android16-6.12 6879524e1c5a 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
2025/08/30 05:10 android16-6.12 6879524e1c5a 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in iterate_supers
* Struck through repros no longer work on HEAD.