syzbot


INFO: task hung in txBegin

Status: upstream: reported C repro on 2024/06/25 15:36
Subsystems: jfs
[Documentation on labels]
Reported-by: syzbot+eda89a33c5856f66f823@syzkaller.appspotmail.com
First crash: 143d, last: 2d02h
Cause bisection: the issue happens on the oldest tested release (bisect log)
Crash: BUG: unable to handle kernel NULL pointer dereference in write_special_inodes (log)
Repro: C syz .config
  
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [jfs?] INFO: task hung in txBegin 0 (4) 2024/06/27 02:53
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 INFO: task hung in txBegin jfs 1 534d 534d 0/1 upstream: reported on 2023/01/31 18:37
Last patch testing requests (3)
Created Duration User Patch Repo Result
2024/06/27 02:53 19m lizhi.xu@windriver.com patch git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 50736169ecc8 report log
2024/06/27 01:59 19m lizhi.xu@windriver.com patch git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 50736169ecc8 error
2024/06/27 00:51 32m lizhi.xu@windriver.com patch git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 50736169ecc8 error

Sample crash report:
INFO: task kworker/u8:11:2848 blocked for more than 143 seconds.
      Not tainted 6.10.0-rc4-syzkaller-00148-g50736169ecc8 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:11   state:D stack:23552 pid:2848  tgid:2848  ppid:2      flags:0x00004000
Workqueue: writeback wb_workfn (flush-7:0)
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x1796/0x49d0 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6837
 io_schedule+0x8d/0x110 kernel/sched/core.c:9043
 TXN_SLEEP_DROP_LOCK fs/jfs/jfs_txnmgr.c:125 [inline]
 txBegin+0x260/0xce0 fs/jfs/jfs_txnmgr.c:374
 jfs_commit_inode+0x223/0x590 fs/jfs/inode.c:101
 jfs_write_inode+0x143/0x220 fs/jfs/inode.c:132
 write_inode fs/fs-writeback.c:1497 [inline]
 __writeback_single_inode+0x6b9/0x10b0 fs/fs-writeback.c:1716
 writeback_sb_inodes+0x99c/0x1380 fs/fs-writeback.c:1947
 wb_writeback+0x481/0xd40 fs/fs-writeback.c:2127
 wb_do_writeback fs/fs-writeback.c:2274 [inline]
 wb_workfn+0x410/0x1090 fs/fs-writeback.c:2314
 process_one_work kernel/workqueue.c:3231 [inline]
 process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
 worker_thread+0x86d/0xd70 kernel/workqueue.c:3393
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
INFO: task syz-executor117:5099 blocked for more than 143 seconds.
      Not tainted 6.10.0-rc4-syzkaller-00148-g50736169ecc8 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor117 state:D stack:19408 pid:5099  tgid:5099  ppid:5098   flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x1796/0x49d0 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6837
 wb_wait_for_completion+0x166/0x290 fs/fs-writeback.c:216
 __writeback_inodes_sb_nr+0x2d2/0x380 fs/fs-writeback.c:2706
 sync_filesystem+0xa4/0x230 fs/sync.c:54
 generic_shutdown_super+0x72/0x2d0 fs/super.c:621
 kill_block_super+0x44/0x90 fs/super.c:1676
 deactivate_locked_super+0xc4/0x130 fs/super.c:473
 cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1267
 task_work_run+0x24f/0x310 kernel/task_work.c:180
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x168/0x370 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe052acc017
RSP: 002b:00007ffd7811a4d8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fe052acc017
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd7811a590
RBP: 00007ffd7811a590 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000206 R12: 00007ffd7811b5f0
R13: 00005555816966c0 R14: 000000000000000f R15: 431bde82d7b634db
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/30:
 #0: ffffffff8e333fa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
 #0: ffffffff8e333fa0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline]
 #0: ffffffff8e333fa0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
2 locks held by kworker/u8:11/2848:
 #0: ffff88801ae86148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline]
 #0: ffff88801ae86148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312
 #1: ffffc900098b7d00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline]
 #1: ffffc900098b7d00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312
2 locks held by getty/4845:
 #0: ffff88802a5ab0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002f162f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2211
1 lock held by syz-executor117/5099:
 #0: ffff88802c5e00e0 (&type->s_umount_key#46){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff88802c5e00e0 (&type->s_umount_key#46){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
 #0: ffff88802c5e00e0 (&type->s_umount_key#46){+.+.}-{3:3}, at: deactivate_super+0xb5/0xf0 fs/super.c:505

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

NMI backtrace for cpu 0
CPU: 0 PID: 30 Comm: khungtaskd Not tainted 6.10.0-rc4-syzkaller-00148-g50736169ecc8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 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:162 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
 watchdog+0xfde/0x1020 kernel/hung_task.c:379
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 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 PID: 51 Comm: kworker/u8:3 Not tainted 6.10.0-rc4-syzkaller-00148-g50736169ecc8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x0/0x90 kernel/kcov.c:310
Code: 10 48 89 74 0a 18 4c 89 44 0a 20 c3 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 4c 8b 04 24 65 48 8b 0c 25 80 d4 03 00 65 8b 05 f0 aa
RSP: 0018:ffffc90000bb7638 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 000ffffffffff000 RCX: ffff888015193c00
RDX: 000000001507c558 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000bb7730 R08: ffffffff81e6dded R09: 1ffffffff25edcb0
R10: dffffc0000000000 R11: fffffbfff25edcb1 R12: 1ffff92000176ed0
R13: 000000001507c067 R14: 0000000000000000 R15: 1ffff92000176ed8
FS:  0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005617e0440680 CR3: 000000000e132000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 pmd_pfn_mask arch/x86/include/asm/pgtable_types.h:453 [inline]
 pmd_pfn arch/x86/include/asm/pgtable.h:234 [inline]
 pte_lockptr include/linux/mm.h:2955 [inline]
 __pte_offset_map_lock+0x17b/0x300 mm/pgtable-generic.c:374
 get_locked_pte include/linux/mm.h:2744 [inline]
 __text_poke+0x2c5/0xd30 arch/x86/kernel/alternative.c:1883
 text_poke arch/x86/kernel/alternative.c:1968 [inline]
 text_poke_bp_batch+0x8cd/0xb30 arch/x86/kernel/alternative.c:2357
 text_poke_flush arch/x86/kernel/alternative.c:2470 [inline]
 text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2477
 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
 static_key_enable_cpuslocked+0x136/0x260 kernel/jump_label.c:205
 static_key_enable+0x1a/0x20 kernel/jump_label.c:218
 toggle_allocation_gate+0xb5/0x250 mm/kfence/core.c:826
 process_one_work kernel/workqueue.c:3231 [inline]
 process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
 worker_thread+0x86d/0xd70 kernel/workqueue.c:3393
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.555 msecs

Crashes (20):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/06/21 15:24 upstream 50736169ecc8 dac2aa43 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs INFO: task hung in txBegin
2024/07/17 03:05 upstream 0434dbe32053 215bec2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in txBegin
2024/07/03 06:21 upstream e9d22f7a6655 1ecfa2d8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in txBegin
2024/06/20 18:41 upstream 2ccbdf43d5e7 dac2aa43 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in txBegin
2024/06/07 16:14 upstream 8a92980606e3 121701b6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in txBegin
2024/06/04 02:08 upstream f06ce441457d a1feae05 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in txBegin
2024/05/22 17:53 upstream 8f6a15f095a6 4d098039 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in txBegin
2024/05/21 18:53 upstream 8f6a15f095a6 4c0d3ee3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in txBegin
2024/05/19 09:10 upstream 0450d2083be6 c0f1611a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in txBegin
2024/05/17 21:07 upstream ff2632d7d08e a12e99e7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in txBegin
2024/05/05 04:47 upstream 7367539ad4b0 610f2a54 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in txBegin
2024/05/04 01:39 upstream ddb4c3f25b7b 610f2a54 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in txBegin
2024/04/26 14:12 upstream c942a0cd3603 059e9963 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in txBegin
2024/04/22 22:43 upstream 4d2008430ce8 21339d7b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in txBegin
2024/04/21 06:55 upstream 977b1ef51866 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in txBegin
2024/02/27 01:13 upstream d206a76d7d27 edd6a5e9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in txBegin
2024/05/26 22:48 linux-next 3689b0ef08b7 a10a183e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in txBegin
2024/05/16 10:09 linux-next dbd9e2e056d8 ef5d53ed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in txBegin
2024/05/16 00:51 linux-next 82d92a9a1b9e 0b3dad46 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in txBegin
2024/05/06 20:12 linux-next 2b84edefcad1 c035c6de .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in txBegin
* Struck through repros no longer work on HEAD.