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: 2084d, last: 1d06h
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 1953d 1790d 0/1 auto-closed as invalid on 2019/04/28 09:45
linux-4.14 INFO: task hung in iterate_supers 16 1161d 1775d 0/1 auto-closed as invalid on 2021/04/29 12:11
linux-4.19 INFO: task hung in iterate_supers (2) 1 1363d 1363d 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 100 4d08h 362d 0/3 upstream: reported C repro on 2023/03/08 18:22
linux-6.1 INFO: task hung in iterate_supers 88 12d 360d 0/3 upstream: reported on 2023/03/10 21:24
linux-4.14 INFO: task hung in iterate_supers (2) 1 374d 374d 0/1 upstream: reported on 2023/02/24 15:59
linux-4.19 INFO: task hung in iterate_supers 7 1495d 1682d 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 364d 1171d 0/1 upstream: reported syz repro on 2020/12/20 03:38
android-49 INFO: task hung in iterate_supers 19 2014d 2115d 0/3 auto-closed as invalid on 2019/02/25 14:49
android-414 INFO: task hung in iterate_supers (2) 1 1772d 1772d 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 995d 991d 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 (2828):
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
2024/03/04 07:03 upstream 58c806d867bf 25905f5d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in iterate_supers
2024/03/03 21:05 upstream 58c806d867bf 25905f5d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in iterate_supers
2024/03/02 06:56 upstream 17ba56605bfd 25905f5d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2024/03/01 22:19 upstream 17ba56605bfd 25905f5d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in iterate_supers
2024/03/01 06:16 upstream 87adedeba51a 352ab904 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in iterate_supers
2024/03/01 00:12 upstream 805d849d7c3c 352ab904 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2024/02/29 16:29 upstream 805d849d7c3c 352ab904 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in iterate_supers
2024/02/28 04:53 upstream cf1182944c7c d367cbe5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in iterate_supers
2024/02/27 22:06 upstream 45ec2f5f6ed3 d367cbe5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2024/02/27 01:11 upstream d206a76d7d27 edd6a5e9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in iterate_supers
2024/02/25 17:38 upstream ab0a97cffa0b 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2024/02/25 16:26 upstream ab0a97cffa0b 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2024/02/25 12:14 upstream ab0a97cffa0b 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in iterate_supers
2024/02/25 10:52 upstream ab0a97cffa0b 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in iterate_supers
2024/02/25 09:18 upstream ab0a97cffa0b 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs 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 01:23 upstream f2e367d6ad3b 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2024/02/24 23:16 upstream f2e367d6ad3b 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2024/02/24 22:00 upstream f2e367d6ad3b 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2024/02/24 20:52 upstream f2e367d6ad3b 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in iterate_supers
2024/02/24 19:27 upstream 603c04e27c3e 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: task hung in iterate_supers
2024/02/24 18:07 upstream 603c04e27c3e 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2024/02/24 16:28 upstream 603c04e27c3e 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in iterate_supers
2024/02/24 12:32 upstream 603c04e27c3e 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in iterate_supers
2024/02/24 10:54 upstream 603c04e27c3e 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2024/02/24 09:34 upstream 603c04e27c3e 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2024/02/24 06:35 upstream 603c04e27c3e 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in iterate_supers
2024/02/24 04:44 upstream 603c04e27c3e 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2024/02/24 00:12 upstream 603c04e27c3e 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in iterate_supers
2024/02/23 19:59 upstream ffd2cb6b718e 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in iterate_supers
2024/02/23 16:15 upstream ffd2cb6b718e 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2024/02/23 14:24 upstream ffd2cb6b718e 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2024/02/23 12:51 upstream ffd2cb6b718e 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in iterate_supers
2024/02/23 10:49 upstream ffd2cb6b718e 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in iterate_supers
2024/02/22 22:49 upstream 1c892cdd8fe0 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in iterate_supers
2024/02/22 20:06 upstream 1c892cdd8fe0 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2024/02/22 05:28 upstream 9fc1ccccfd8d 345111b5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in iterate_supers
2024/02/22 03:55 upstream 39133352cbed 345111b5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in iterate_supers
2024/02/22 02:34 upstream 39133352cbed 345111b5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in iterate_supers
2024/02/22 00:06 upstream 39133352cbed 345111b5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in iterate_supers
2024/02/21 22:13 upstream 9fc1ccccfd8d 345111b5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: task hung in iterate_supers
2024/02/21 20:22 upstream 39133352cbed 345111b5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in iterate_supers
2024/02/21 19:07 upstream 9fc1ccccfd8d 345111b5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in iterate_supers
2024/02/21 17:59 upstream 9fc1ccccfd8d 3af7dd65 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in iterate_supers
2024/02/21 16:57 upstream 9fc1ccccfd8d 3af7dd65 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root 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
2024/02/23 00:05 upstream 1c892cdd8fe0 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 INFO: task hung in iterate_supers
2024/02/22 10:05 upstream 39133352cbed 345111b5 .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
2024/02/11 20:23 linux-next 445a555e0623 77b23aa1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in iterate_supers
2024/02/29 13:11 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 381f163531d8 352ab904 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in iterate_supers
2024/02/28 15:51 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 9abbc24128bc d367cbe5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in iterate_supers
2024/02/27 20:38 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 9abbc24128bc 05e69c83 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in iterate_supers
2024/02/27 07:48 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 9abbc24128bc 05e69c83 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in iterate_supers
2024/02/26 14:48 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 9abbc24128bc edd6a5e9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in iterate_supers
2024/02/21 21:43 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 59a96b711109 345111b5 .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.