INFO: task hung in jbd2_journal_commit_transaction (2)

Status: upstream: reported on 2026/08/05 22:06
Reported-by: syzbot+8d4e4885d6259adfc43e@syzkaller.appspotmail.com
First crash: 101d, last: 2d10h
▶ ▼ Similar bugs (13)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-6-12 INFO: task hung in jbd2_journal_commit_transaction origin:upstream 1 syz, C 111 5d23h 106d 0/1 premoderation: reported C repro on 2026/07/31 15:32
upstream INFO: task hung in jbd2_journal_commit_transaction (2) ext4 1 1 2074d 2074d 0/29 auto-closed as invalid on 2021/06/09 10:13
android-44 INFO: task hung in jbd2_journal_commit_transaction 1 syz, C 6 3059d 2773d 0/2 public: reported C repro on 2019/04/13 00:00
android-49 INFO: task hung in jbd2_journal_commit_transaction 1 5 2967d 3112d 0/3 auto-closed as invalid on 2019/03/29 12:13
upstream INFO: task hung in jbd2_journal_commit_transaction (5) prio:low ext4 1 syz, C error error 3681 1d18h 914d 0/29 upstream: reported C repro on 2024/05/15 03:54
linux-6.1 INFO: task hung in jbd2_journal_commit_transaction 1 1 1262d 1262d 0/3 auto-obsoleted due to no activity on 2023/09/09 09:50
linux-5.15 INFO: task hung in jbd2_journal_commit_transaction 1 120 13d 101d 0/3 upstream: reported on 2026/08/05 05:38
linux-6.1 INFO: task hung in jbd2_journal_commit_transaction (2) origin:lts-only 1 syz, C inconclusive 176 2d10h 491d 0/3 upstream: reported C repro on 2025/07/11 16:44
upstream INFO: task hung in jbd2_journal_commit_transaction (4) ext4 1 7 1206d 1354d 0/29 auto-obsoleted due to no activity on 2023/10/25 18:13
upstream INFO: task hung in jbd2_journal_commit_transaction (3) ext4 1 syz, C error error 24 1507d 1792d 0/29 auto-obsoleted due to no activity on 2023/01/27 09:20
upstream INFO: task hung in jbd2_journal_commit_transaction ext4 1 syz, C 52 2954d 2973d 0/29 closed as dup on 2018/10/02 14:53
linux-6.6 INFO: task hung in jbd2_journal_commit_transaction 1 2 405d 491d 0/2 auto-obsoleted due to no activity on 2026/01/13 11:32
android-414 INFO: task hung in jbd2_journal_commit_transaction 1 syz, C 31 2959d 2775d 0/1 public: reported C repro on 2019/04/11 00:00

Sample crash report:
INFO: task jbd2/sda1-8:5115 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:jbd2/sda1-8     state:D stack:26024 pid:5115  ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5393 [inline]
 __schedule+0x156f/0x4720 kernel/sched/core.c:6722
 schedule+0xbd/0x170 kernel/sched/core.c:6796
 io_schedule+0x80/0xd0 kernel/sched/core.c:9075
 bit_wait_io+0x13/0x100 kernel/sched/wait_bit.c:209
 __wait_on_bit+0x9f/0x2c0 kernel/sched/wait_bit.c:49
 out_of_line_wait_on_bit+0x13c/0x190 kernel/sched/wait_bit.c:64
 wait_on_buffer include/linux/buffer_head.h:373 [inline]
 jbd2_journal_commit_transaction+0x2e90/0x5ad0 fs/jbd2/commit.c:815
 kjournald2+0x40f/0x810 fs/jbd2/journal.c:201
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
INFO: task syz-executor:5769 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:21896 pid:5769  ppid:5768   flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5393 [inline]
 __schedule+0x156f/0x4720 kernel/sched/core.c:6722
 schedule+0xbd/0x170 kernel/sched/core.c:6796
 io_schedule+0x80/0xd0 kernel/sched/core.c:9075
 bit_wait_io+0x13/0x100 kernel/sched/wait_bit.c:209
 __wait_on_bit+0x9f/0x2c0 kernel/sched/wait_bit.c:49
 out_of_line_wait_on_bit+0x13c/0x190 kernel/sched/wait_bit.c:64
 wait_on_bit_io include/linux/wait_bit.h:101 [inline]
 do_get_write_access+0x5c9/0xe00 fs/jbd2/transaction.c:1096
 jbd2_journal_get_write_access+0x10c/0x140 fs/jbd2/transaction.c:1231
 __ext4_journal_get_write_access+0x208/0x6d0 fs/ext4/ext4_jbd2.c:241
 ext4_reserve_inode_write+0x205/0x2a0 fs/ext4/inode.c:5967
 __ext4_mark_inode_dirty+0x13f/0x720 fs/ext4/inode.c:6151
 ext4_dirty_inode+0xcb/0x110 fs/ext4/inode.c:6188
 __mark_inode_dirty+0x2cc/0xc90 fs/fs-writeback.c:2537
 generic_update_time fs/inode.c:1978 [inline]
 inode_update_time fs/inode.c:1991 [inline]
 __file_update_time fs/inode.c:2177 [inline]
 file_update_time+0x187/0x1a0 fs/inode.c:2207
 ext4_page_mkwrite+0x1f9/0x11a0 fs/ext4/inode.c:6306
 do_page_mkwrite+0x153/0x3f0 mm/memory.c:2951
 wp_page_shared mm/memory.c:3311 [inline]
 do_wp_page+0xd4d/0x34d0 mm/memory.c:3396
 handle_pte_fault mm/memory.c:5063 [inline]
 __handle_mm_fault mm/memory.c:5190 [inline]
 handle_mm_fault+0x1300/0x4a40 mm/memory.c:5355
 do_user_addr_fault+0xeb7/0x13e0 arch/x86/mm/fault.c:1371
 handle_page_fault arch/x86/mm/fault.c:1463 [inline]
 exc_page_fault+0x64/0x100 arch/x86/mm/fault.c:1516
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7f2010a7e811
RSP: 002b:00007fffd0731430 EFLAGS: 00010202
RAX: 0000000000000002 RBX: 0000000000000001 RCX: 0000000000000001
RDX: 00007f200e82c000 RSI: 0000000000000c69 RDI: ffffffff8a4fffff
RBP: 00007fffd0731930 R08: 0000000000001000 R09: 000055556bee5b38
R10: 0000000000000092 R11: 000055556bee5c18 R12: 00007fffd0731770
R13: 00007fffd0731560 R14: 585858582e7a7973 R15: 00007fffd07314b0
 </TASK>
INFO: task syz.7.3827:21103 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.7.3827      state:D stack:27048 pid:21103 ppid:17621  flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5393 [inline]
 __schedule+0x156f/0x4720 kernel/sched/core.c:6722
 schedule+0xbd/0x170 kernel/sched/core.c:6796
 io_schedule+0x80/0xd0 kernel/sched/core.c:9075
 bit_wait_io+0x13/0x100 kernel/sched/wait_bit.c:209
 __wait_on_bit+0x9f/0x2c0 kernel/sched/wait_bit.c:49
 out_of_line_wait_on_bit+0x13c/0x190 kernel/sched/wait_bit.c:64
 wait_on_bit_io include/linux/wait_bit.h:101 [inline]
 do_get_write_access+0x5c9/0xe00 fs/jbd2/transaction.c:1096
 jbd2_journal_get_write_access+0x10c/0x140 fs/jbd2/transaction.c:1231
 __ext4_journal_get_write_access+0x208/0x6d0 fs/ext4/ext4_jbd2.c:241
 ext4_reserve_inode_write+0x205/0x2a0 fs/ext4/inode.c:5967
 __ext4_mark_inode_dirty+0x13f/0x720 fs/ext4/inode.c:6151
 ext4_dirty_inode+0xcb/0x110 fs/ext4/inode.c:6188
 __mark_inode_dirty+0x2cc/0xc90 fs/fs-writeback.c:2537
 generic_update_time fs/inode.c:1978 [inline]
 inode_update_time fs/inode.c:1991 [inline]
 __file_update_time fs/inode.c:2177 [inline]
 file_update_time+0x187/0x1a0 fs/inode.c:2207
 ext4_page_mkwrite+0x1f9/0x11a0 fs/ext4/inode.c:6306
 do_page_mkwrite+0x153/0x3f0 mm/memory.c:2951
 do_shared_fault mm/memory.c:4717 [inline]
 do_fault mm/memory.c:4779 [inline]
 do_pte_missing mm/memory.c:3689 [inline]
 handle_pte_fault mm/memory.c:5047 [inline]
 __handle_mm_fault mm/memory.c:5190 [inline]
 handle_mm_fault+0x1a26/0x4a40 mm/memory.c:5355
 do_user_addr_fault+0xeb7/0x13e0 arch/x86/mm/fault.c:1371
 handle_page_fault arch/x86/mm/fault.c:1463 [inline]
 exc_page_fault+0x64/0x100 arch/x86/mm/fault.c:1516
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7f8f6c474931
RSP: 002b:00007ffc86620550 EFLAGS: 00010202
RAX: 0000001b32224000 RBX: ffffffff81f9568a RCX: 0000001b32223ff8
RDX: 00000000005ffde8 RSI: 00000000005ffde8 RDI: 00007f8f6d355700
RBP: 0000000000000001 R08: 0000000000000000 R09: 00007f8f6c812000
R10: 00007f8f6d355700 R11: 0000000000000000 R12: 00007f8f6c826038
R13: 0000000000000000 R14: ffffffff81f95fe0 R15: 00007f8f6d355720
 </TASK>
INFO: task syz.6.3826:21105 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.3826      state:D stack:27048 pid:21105 ppid:19583  flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5393 [inline]
 __schedule+0x156f/0x4720 kernel/sched/core.c:6722
 schedule+0xbd/0x170 kernel/sched/core.c:6796
 io_schedule+0x80/0xd0 kernel/sched/core.c:9075
 bit_wait_io+0x13/0x100 kernel/sched/wait_bit.c:209
 __wait_on_bit+0x9f/0x2c0 kernel/sched/wait_bit.c:49
 out_of_line_wait_on_bit+0x13c/0x190 kernel/sched/wait_bit.c:64
 wait_on_bit_io include/linux/wait_bit.h:101 [inline]
 do_get_write_access+0x5c9/0xe00 fs/jbd2/transaction.c:1096
 jbd2_journal_get_write_access+0x10c/0x140 fs/jbd2/transaction.c:1231
 __ext4_journal_get_write_access+0x208/0x6d0 fs/ext4/ext4_jbd2.c:241
 ext4_reserve_inode_write+0x205/0x2a0 fs/ext4/inode.c:5967
 __ext4_mark_inode_dirty+0x13f/0x720 fs/ext4/inode.c:6151
 ext4_dirty_inode+0xcb/0x110 fs/ext4/inode.c:6188
 __mark_inode_dirty+0x2cc/0xc90 fs/fs-writeback.c:2537
 generic_update_time fs/inode.c:1978 [inline]
 inode_update_time fs/inode.c:1991 [inline]
 __file_update_time fs/inode.c:2177 [inline]
 file_update_time+0x187/0x1a0 fs/inode.c:2207
 ext4_page_mkwrite+0x1f9/0x11a0 fs/ext4/inode.c:6306
 do_page_mkwrite+0x153/0x3f0 mm/memory.c:2951
 do_shared_fault mm/memory.c:4717 [inline]
 do_fault mm/memory.c:4779 [inline]
 do_pte_missing mm/memory.c:3689 [inline]
 handle_pte_fault mm/memory.c:5047 [inline]
 __handle_mm_fault mm/memory.c:5190 [inline]
 handle_mm_fault+0x1a26/0x4a40 mm/memory.c:5355
 do_user_addr_fault+0xeb7/0x13e0 arch/x86/mm/fault.c:1371
 handle_page_fault arch/x86/mm/fault.c:1463 [inline]
 exc_page_fault+0x64/0x100 arch/x86/mm/fault.c:1516
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7f539fa74931
RSP: 002b:00007ffd72287b50 EFLAGS: 00010202
RAX: 0000001b33112000 RBX: ffffffff8a865dd6 RCX: 0000001b33111ff8
RDX: 0000001b32b2421c RSI: 0000000000000008 RDI: 00007f53a0955720
RBP: 00000000000004aa R08: 00007f539fe10000 R09: 00007f539fe12000
R10: 000000008a865dda R11: 0000000000000002 R12: 00007f539fe26038
R13: 000000000003a2b1 R14: ffffffff8a8650ca R15: 00007f53a0955720
 </TASK>
INFO: task syz-executor:21113 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:21736 pid:21113 ppid:21092  flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5393 [inline]
 __schedule+0x156f/0x4720 kernel/sched/core.c:6722
 schedule+0xbd/0x170 kernel/sched/core.c:6796
 io_schedule+0x80/0xd0 kernel/sched/core.c:9075
 bit_wait_io+0x13/0x100 kernel/sched/wait_bit.c:209
 __wait_on_bit+0x9f/0x2c0 kernel/sched/wait_bit.c:49
 out_of_line_wait_on_bit+0x13c/0x190 kernel/sched/wait_bit.c:64
 wait_on_bit_io include/linux/wait_bit.h:101 [inline]
 do_get_write_access+0x5c9/0xe00 fs/jbd2/transaction.c:1096
 jbd2_journal_get_write_access+0x10c/0x140 fs/jbd2/transaction.c:1231
 __ext4_journal_get_write_access+0x208/0x6d0 fs/ext4/ext4_jbd2.c:241
 __ext4_new_inode+0x140c/0x3aa0 fs/ext4/ialloc.c:1101
 ext4_mkdir+0x40b/0xc90 fs/ext4/namei.c:3068
 vfs_mkdir+0x2a5/0x470 fs/namei.c:4180
 do_mkdirat+0x1dc/0x450 fs/namei.c:4203
 __do_sys_mkdirat fs/namei.c:4218 [inline]
 __se_sys_mkdirat fs/namei.c:4216 [inline]
 __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4216
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f20ba5a8347
RSP: 002b:00007ffeaf59ed98 EFLAGS: 00000206 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f20ba637a4b RCX: 00007f20ba5a8347
RDX: 00000000000001ff RSI: 00007f20ba637a4b RDI: 00000000ffffff9c
RBP: 00007f20ba8267b8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000008
R13: 0000000000000003 R14: 00007ffeaf59f008 R15: 0000000000000000
 </TASK>
INFO: task syz.8.3829:21121 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.8.3829      state:D stack:27560 pid:21121 ppid:20772  flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5393 [inline]
 __schedule+0x156f/0x4720 kernel/sched/core.c:6722
 schedule+0xbd/0x170 kernel/sched/core.c:6796
 io_schedule+0x80/0xd0 kernel/sched/core.c:9075
 bit_wait_io+0x13/0x100 kernel/sched/wait_bit.c:209
 __wait_on_bit+0x9f/0x2c0 kernel/sched/wait_bit.c:49
 out_of_line_wait_on_bit+0x13c/0x190 kernel/sched/wait_bit.c:64
 wait_on_bit_io include/linux/wait_bit.h:101 [inline]
 do_get_write_access+0x5c9/0xe00 fs/jbd2/transaction.c:1096
 jbd2_journal_get_write_access+0x10c/0x140 fs/jbd2/transaction.c:1231
 __ext4_journal_get_write_access+0x208/0x6d0 fs/ext4/ext4_jbd2.c:241
 ext4_reserve_inode_write+0x205/0x2a0 fs/ext4/inode.c:5967
 __ext4_mark_inode_dirty+0x13f/0x720 fs/ext4/inode.c:6151
 ext4_dirty_inode+0xcb/0x110 fs/ext4/inode.c:6188
 __mark_inode_dirty+0x2cc/0xc90 fs/fs-writeback.c:2537
 generic_update_time fs/inode.c:1978 [inline]
 inode_update_time fs/inode.c:1991 [inline]
 __file_update_time fs/inode.c:2177 [inline]
 file_update_time+0x187/0x1a0 fs/inode.c:2207
 ext4_page_mkwrite+0x1f9/0x11a0 fs/ext4/inode.c:6306
 do_page_mkwrite+0x153/0x3f0 mm/memory.c:2951
 do_shared_fault mm/memory.c:4717 [inline]
 do_fault mm/memory.c:4779 [inline]
 do_pte_missing mm/memory.c:3689 [inline]
 handle_pte_fault mm/memory.c:5047 [inline]
 __handle_mm_fault mm/memory.c:5190 [inline]
 handle_mm_fault+0x1a26/0x4a40 mm/memory.c:5355
 do_user_addr_fault+0xeb7/0x13e0 arch/x86/mm/fault.c:1371
 handle_page_fault arch/x86/mm/fault.c:1463 [inline]
 exc_page_fault+0x64/0x100 arch/x86/mm/fault.c:1516
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7ff92666d023
RSP: 002b:00007ffeee0a8b90 EFLAGS: 00010246
RAX: 00000000005ffde8 RBX: 0000000000000000 RCX: 0000001b2d764000
RDX: 0000001b2d724000 RSI: 0000000000600000 RDI: 00007ff9269ea708
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffeee0a8e20
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/28:
 #0: ffffffff8e1322e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
 #0: ffffffff8e1322e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
 #0: ffffffff8e1322e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6669
1 lock held by klogd/5141:
 #0: ffff8880b8c3c258 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x9c/0x130 kernel/sched/core.c:578
3 locks held by syz-executor/5769:
 #0: ffff88807ba7baa0 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:165 [inline]
 #0: ffff88807ba7baa0 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5382 [inline]
 #0: ffff88807ba7baa0 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x32/0x2f0 mm/memory.c:5442
 #1: ffff888033762510 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1634 [inline]
 #1: ffff888033762510 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs.h:1738 [inline]
 #1: ffff888033762510 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1e2/0x11a0 fs/ext4/inode.c:6305
 #2: ffff88803326c990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1f3f/0x2170 fs/jbd2/transaction.c:448
2 locks held by getty/18941:
 #0: ffff88814c2790a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000c4f52f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x43a/0x1400 drivers/tty/n_tty.c:2217
3 locks held by syz.7.3827/21103:
 #0: ffff888077cfc420 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:165 [inline]
 #0: ffff888077cfc420 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5382 [inline]
 #0: ffff888077cfc420 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x32/0x2f0 mm/memory.c:5442
 #1: ffff888033762510 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1634 [inline]
 #1: ffff888033762510 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs.h:1738 [inline]
 #1: ffff888033762510 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1e2/0x11a0 fs/ext4/inode.c:6305
 #2: ffff88803326c990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1f3f/0x2170 fs/jbd2/transaction.c:448
3 locks held by syz.6.3826/21105:
 #0: ffff888077cfea20 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:165 [inline]
 #0: ffff888077cfea20 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5382 [inline]
 #0: ffff888077cfea20 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x32/0x2f0 mm/memory.c:5442
 #1: ffff888033762510 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1634 [inline]
 #1: ffff888033762510 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs.h:1738 [inline]
 #1: ffff888033762510 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1e2/0x11a0 fs/ext4/inode.c:6305
 #2: ffff88803326c990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1f3f/0x2170 fs/jbd2/transaction.c:448
3 locks held by syz-executor/21113:
 #0: ffff888033762418 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:412
 #1: ffff88805af7f210 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:839 [inline]
 #1: ffff88805af7f210 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: filename_create+0x20f/0x450 fs/namei.c:3949
 #2: ffff88803326c990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1f3f/0x2170 fs/jbd2/transaction.c:448
3 locks held by syz.8.3829/21121:
 #0: ffff888077cfcda0 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:165 [inline]
 #0: ffff888077cfcda0 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5382 [inline]
 #0: ffff888077cfcda0 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x32/0x2f0 mm/memory.c:5442
 #1: ffff888033762510 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1634 [inline]
 #1: ffff888033762510 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs.h:1738 [inline]
 #1: ffff888033762510 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1e2/0x11a0 fs/ext4/inode.c:6305
 #2: ffff88803326c990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1f3f/0x2170 fs/jbd2/transaction.c:448

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

NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x3a6/0x3e0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x17a/0x2f0 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+0xf59/0xfa0 kernel/hung_task.c:379
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 7850 Comm: kworker/u4:108 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
Workqueue: events_unbound nsim_dev_trap_report_work
RIP: 0010:__sanitizer_cov_trace_switch+0xda/0xe0 kernel/kcov.c:-1
Code: e3 05 4c 8d 63 28 4d 39 fc 77 9d 49 ff c6 4d 89 33 49 89 4c 1b 08 4d 89 54 1b 10 49 89 7c 1b 18 49 89 54 1b 20 eb 81 5b 41 5c <41> 5e 41 5f c3 90 66 0f 1f 00 c7 87 00 16 00 00 00 00 00 00 48 c7
RSP: 0018:ffffc900056bf5a0 EFLAGS: 00000246
RAX: 0000000000000002 RBX: ffffffff901d9924 RCX: 0000000000000003
RDX: ffffffff813bea28 RSI: ffffffff8dfa0a60 RDI: 0000000000000002
RBP: ffffc900056bf6d8 R08: ffff888022d25a00 R09: 0000000000000002
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff901d9929
R13: ffffc900056bf688 R14: 0000000000000002 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b8c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005596166d4168 CR3: 000000000df32000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 unwind_next_frame+0x658/0x2990 arch/x86/kernel/unwind_orc.c:505
 arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
 ____kasan_kmalloc mm/kasan/common.c:375 [inline]
 __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:384
 kasan_kmalloc include/linux/kasan.h:198 [inline]
 __do_kmalloc_node mm/slab_common.c:1007 [inline]
 __kmalloc_node_track_caller+0xb4/0x230 mm/slab_common.c:1027
 kmalloc_reserve+0x116/0x240 net/core/skbuff.c:584
 __alloc_skb+0x138/0x2c0 net/core/skbuff.c:653
 alloc_skb include/linux/skbuff.h:1316 [inline]
 nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:748 [inline]
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:805 [inline]
 nsim_dev_trap_report_work+0x253/0xa90 drivers/net/netdevsim/dev.c:851
 process_one_work kernel/workqueue.c:2657 [inline]
 process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2734
 worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2815
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>

Crashes (256):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/11/12 18:07 linux-6.6.y 5139929c698c c0087d7f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/11/12 01:45 linux-6.6.y 5139929c698c 8d68b303 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/11/10 16:14 linux-6.6.y 5139929c698c d3056657 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/11/10 03:44 linux-6.6.y 5139929c698c 70ec0380 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/11/06 21:59 linux-6.6.y 5139929c698c 5cecaf1f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/11/05 08:22 linux-6.6.y b5a1dc3ad482 2ee8459f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/11/04 17:15 linux-6.6.y b5a1dc3ad482 73438ed0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/11/04 05:32 linux-6.6.y b5a1dc3ad482 5af5b6c6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/11/03 14:48 linux-6.6.y b5a1dc3ad482 e2d35131 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/11/03 14:22 linux-6.6.y b5a1dc3ad482 e2d35131 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/11/02 13:02 linux-6.6.y b5a1dc3ad482 6969b601 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/11/01 03:28 linux-6.6.y b5a1dc3ad482 25a0ae84 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/31 10:24 linux-6.6.y b5a1dc3ad482 2041d3f8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/30 19:53 linux-6.6.y b5a1dc3ad482 0ec395f8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/30 18:26 linux-6.6.y b5a1dc3ad482 0ec395f8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/30 15:36 linux-6.6.y b5a1dc3ad482 b498adee .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/29 20:00 linux-6.6.y 0aebf2870d53 b498adee .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/29 09:53 linux-6.6.y 0aebf2870d53 b1d00f76 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/29 05:22 linux-6.6.y 0aebf2870d53 b1d00f76 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/29 05:22 linux-6.6.y 0aebf2870d53 b1d00f76 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/27 17:58 linux-6.6.y 0aebf2870d53 96923c60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/27 12:01 linux-6.6.y 0aebf2870d53 168cb7a2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/26 14:04 linux-6.6.y 0aebf2870d53 168cb7a2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/23 23:58 linux-6.6.y 0aebf2870d53 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/23 07:15 linux-6.6.y 0aebf2870d53 d566bfda .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/21 21:51 linux-6.6.y 0aebf2870d53 4ba27f85 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/21 11:27 linux-6.6.y 0aebf2870d53 61c200c7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/21 06:44 linux-6.6.y cecd39af8a1a 61c200c7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/20 13:08 linux-6.6.y cecd39af8a1a df8746fb .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/20 12:36 linux-6.6.y cecd39af8a1a df8746fb .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/19 16:05 linux-6.6.y cecd39af8a1a 72cdc28d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/17 00:57 linux-6.6.y cecd39af8a1a 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/16 13:14 linux-6.6.y cecd39af8a1a 4c840a2f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/15 21:47 linux-6.6.y cecd39af8a1a 3f2522c6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/15 14:21 linux-6.6.y cecd39af8a1a 8fb0ae89 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/15 03:04 linux-6.6.y a91a6aa9253c 8fb0ae89 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/14 16:42 linux-6.6.y a91a6aa9253c 1a71827b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/14 13:02 linux-6.6.y a91a6aa9253c 1a71827b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/14 13:00 linux-6.6.y a91a6aa9253c 1a71827b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/13 23:32 linux-6.6.y a91a6aa9253c 7321cd29 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/13 08:49 linux-6.6.y a91a6aa9253c 5a1eeac4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/12 15:39 linux-6.6.y a91a6aa9253c 745a967f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/09 19:40 linux-6.6.y a91a6aa9253c 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/08 19:15 linux-6.6.y a91a6aa9253c b2734a59 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/08 07:41 linux-6.6.y a91a6aa9253c 4f6a9fcf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/07 11:11 linux-6.6.y a91a6aa9253c 6520ecdb .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/06 01:44 linux-6.6.y a91a6aa9253c f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/05 12:57 linux-6.6.y a91a6aa9253c af63e995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/03 13:33 linux-6.6.y a91a6aa9253c 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/10/02 03:04 linux-6.6.y 79643295eba1 6d32eb1f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/08/05 22:06 linux-6.6.y aa0e49877a2e cd5b1963 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
* Struck through repros no longer work on HEAD.