syzbot


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: 2125d, last: 4h23m
Cause 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 (11)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-414 INFO: task hung in iterate_supers 1 1994d 1831d 0/1 auto-closed as invalid on 2019/04/28 09:45
linux-4.14 INFO: task hung in iterate_supers 16 1202d 1817d 0/1 auto-closed as invalid on 2021/04/29 12:11
linux-4.19 INFO: task hung in iterate_supers (2) 1 1404d 1404d 0/1 auto-closed as invalid on 2020/10/09 12:15
linux-5.15 INFO: task hung in iterate_supers origin:lts-only C 119 6h25m 403d 0/3 upstream: reported C repro on 2023/03/08 18:22
linux-6.1 INFO: task hung in iterate_supers 101 6d16h 401d 0/3 upstream: reported on 2023/03/10 21:24
linux-4.14 INFO: task hung in iterate_supers (2) 1 415d 415d 0/1 upstream: reported on 2023/02/24 15:59
linux-4.19 INFO: task hung in iterate_supers 7 1536d 1724d 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 syz 378 405d 1212d 0/1 upstream: reported syz repro on 2020/12/20 03:38
android-49 INFO: task hung in iterate_supers 19 2056d 2156d 0/3 auto-closed as invalid on 2019/02/25 14:49
android-414 INFO: task hung in iterate_supers (2) 1 1813d 1813d 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 1036d 1032d 0/26 auto-closed as invalid on 2021/08/13 03:51
Last patch testing requests (1)
Created Duration User Patch Repo Result
2022/07/28 04:10 15m penguin-kernel@i-love.sakura.ne.jp patch upstream OK log

Sample crash report:
INFO: task syz-executor262:5077 blocked for more than 143 seconds.
      Not tainted 6.8.0-rc5-syzkaller-00297-gf2e367d6ad3b #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor262 state:D stack:27664 pid:5077  tgid:5075  ppid:5074   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5400 [inline]
 __schedule+0x177f/0x49a0 kernel/sched/core.c:6727
 __schedule_loop kernel/sched/core.c:6802 [inline]
 schedule+0x149/0x260 kernel/sched/core.c:6817
 super_lock+0x335/0x400 fs/super.c:114
 super_lock_shared fs/super.c:139 [inline]
 iterate_supers+0x8c/0x190 fs/super.c:924
 ksys_sync+0xbd/0x1c0 fs/sync.c:102
 __do_sys_sync+0xe/0x20 fs/sync.c:113
 do_syscall_64+0xf9/0x240
 entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7fe96cefb4f9
RSP: 002b:00007fe96ce8f218 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fe96cf7d6d8 RCX: 00007fe96cefb4f9
RDX: 00007fe96cefb4f9 RSI: 00000000000f4240 RDI: 0000000000000081
RBP: 00007fe96cf7d6d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe96cf497e0
R13: 00007fe96cf482e0 R14: 00007fe96cf48060 R15: 0030656c69662f2e
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/29:
 #0: ffffffff8e130c60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
 #0: ffffffff8e130c60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
 #0: ffffffff8e130c60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
2 locks held by kworker/u4:3/49:
 #0: ffff8880b953c918 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:559
 #1: ffff8880b9528988 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x441/0x770 kernel/sched/psi.c:988
3 locks held by kworker/0:2/1139:
2 locks held by getty/4816:
 #0: ffff88802b6b70a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b4/0x1e10 drivers/tty/n_tty.c:2201
1 lock held by syz-executor262/5076:

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

NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.8.0-rc5-syzkaller-00297-gf2e367d6ad3b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x320 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+0xfaf/0xff0 kernel/hung_task.c:379
 kthread+0x2ef/0x390 kernel/kthread.c:388
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 1139 Comm: kworker/0:2 Not tainted 6.8.0-rc5-syzkaller-00297-gf2e367d6ad3b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Workqueue: events_power_efficient gc_worker
RIP: 0010:kasan_check_range+0xc/0x290 mm/kasan/generic.c:188
Code: 0f 0b 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 55 41 57 41 56 41 54 53 <b0> 01 48 85 f6 0f 84 a0 01 00 00 4c 8d 04 37 49 39 f8 0f 82 56 02
RSP: 0018:ffffc900047f7820 EFLAGS: 00000046
RAX: 0000000000000011 RBX: 0000000000000478 RCX: ffffffff81712b18
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff92c564a8
RBP: fd74752d59ff56fd R08: ffffffff92c56427 R09: 1ffffffff258ac84
R10: dffffc0000000000 R11: fffffbfff258ac85 R12: ffff888023071dc0
R13: ffff888023071dc0 R14: 0000000000000000 R15: ffff888023071dc0
FS:  0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055c04956d6d0 CR3: 000000001e696000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 instrument_atomic_read include/linux/instrumented.h:68 [inline]
 _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
 hlock_class kernel/locking/lockdep.c:228 [inline]
 __lock_acquire+0xf18/0x1fd0 kernel/locking/lockdep.c:5133
 lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754
 rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
 rcu_read_lock include/linux/rcupdate.h:750 [inline]
 gc_worker+0x28c/0x15a0 net/netfilter/nf_conntrack_core.c:1488
 process_one_work kernel/workqueue.c:2633 [inline]
 process_scheduled_works+0x913/0x1420 kernel/workqueue.c:2706
 worker_thread+0xa5f/0x1000 kernel/workqueue.c:2787
 kthread+0x2ef/0x390 kernel/kthread.c:388
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242
 </TASK>

Crashes (2891):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
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
2023/11/17 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
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
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
2018/07/10 04:07 linux-next d00d6d9a339d f25e5770 .config console log report syz C ci-upstream-linux-next-kasan-gce-root
2024/04/15 11:24 upstream fe46a7dd189e c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in iterate_supers
2024/04/11 05:06 upstream fe46a7dd189e 56086b24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in iterate_supers
2024/04/09 06:39 upstream fe46a7dd189e 53df08b6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in iterate_supers
2024/04/08 11:57 upstream fe46a7dd189e ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in iterate_supers
2024/04/02 07:45 upstream fe46a7dd189e 6baf5069 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in iterate_supers
2024/04/02 03:41 upstream fe46a7dd189e 6baf5069 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in iterate_supers
2024/04/01 17:38 upstream fe46a7dd189e 6baf5069 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in iterate_supers
2024/04/01 15:22 upstream fe46a7dd189e 6baf5069 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in iterate_supers
2024/04/01 10:50 upstream fe46a7dd189e 6baf5069 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in iterate_supers
2024/03/30 23:36 upstream fe46a7dd189e 6baf5069 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in iterate_supers
2024/03/29 22:10 upstream fe46a7dd189e c52bcb23 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in iterate_supers
2024/03/28 03:11 upstream fe46a7dd189e 454571b6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in iterate_supers
2024/03/27 23:47 upstream fe46a7dd189e 454571b6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in iterate_supers
2024/03/27 18:18 upstream fe46a7dd189e 454571b6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in iterate_supers
2024/03/26 04:56 upstream fe46a7dd189e 0ea90952 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in iterate_supers
2024/03/25 08:58 upstream fe46a7dd189e 0ea90952 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in iterate_supers
2024/03/24 08:48 upstream fe46a7dd189e 0ea90952 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in iterate_supers
2024/03/21 15:32 upstream fe46a7dd189e 6753db5c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in iterate_supers
2024/03/20 19:41 upstream fe46a7dd189e 5b7d42ae .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in iterate_supers
2024/03/17 10:05 upstream fe46a7dd189e d615901c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in iterate_supers
2024/03/14 06:10 upstream 61387b8dcf1d f919f202 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in iterate_supers
2024/03/13 17:04 upstream 9187210eee7d db5b7ff0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in iterate_supers
2024/03/13 06:49 upstream 9187210eee7d db5b7ff0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in iterate_supers
2024/03/13 03:36 upstream 855684c7d938 c35c26ec .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in iterate_supers
2024/03/13 01:24 upstream 855684c7d938 c35c26ec .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in iterate_supers
2024/03/12 13:17 upstream 855684c7d938 c35c26ec .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2024/03/11 18:06 upstream e8f897f4afef 6ee49f2e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in iterate_supers
2024/03/10 17:35 upstream 005f6f34bd47 6ee49f2e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in iterate_supers
2024/03/10 10:42 upstream 005f6f34bd47 6ee49f2e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2024/03/09 16:36 upstream 09e5c48fea17 6ee49f2e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-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
2024/02/23 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
2024/04/15 07:13 linux-next 6bd343537461 c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in iterate_supers
2024/04/14 11:04 linux-next 9ed46da14b9b c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in iterate_supers
2024/04/14 09:12 linux-next 9ed46da14b9b c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in iterate_supers
2024/04/13 22:25 linux-next 9ed46da14b9b c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in iterate_supers
2024/04/13 20:56 linux-next 9ed46da14b9b c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in iterate_supers
2024/04/11 01:45 linux-next 6ebf211bb11d 56086b24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in iterate_supers
2024/04/11 00:37 linux-next 6ebf211bb11d 56086b24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in iterate_supers
2024/04/10 15:28 linux-next a053fd3ca5d1 56086b24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in iterate_supers
2024/04/09 04:43 linux-next 11cb68ad52ac 53df08b6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in iterate_supers
2024/04/09 01:44 linux-next 11cb68ad52ac 53df08b6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in iterate_supers
2024/04/07 18:00 linux-next 8568bb2ccc27 ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in iterate_supers
2024/04/07 09:04 linux-next 8568bb2ccc27 ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in iterate_supers
2024/04/01 00:41 linux-next a6bd6c933339 6baf5069 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in iterate_supers
2024/03/31 15:02 linux-next a6bd6c933339 6baf5069 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in iterate_supers
2024/03/29 06:59 linux-next a6bd6c933339 120789fd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in iterate_supers
2024/03/25 18:20 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 707081b61156 0ea90952 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in iterate_supers
2024/03/20 02:42 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 707081b61156 a485f239 .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
* Struck through repros no longer work on HEAD.