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: 85d, last: 13h36m
▶ ▼ 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 106 1h06m 90d 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 2058d 2058d 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 3044d 2757d 0/2 public: reported C repro on 2019/04/13 00:00
android-49 INFO: task hung in jbd2_journal_commit_transaction 1 5 2951d 3096d 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 3589 7h09m 898d 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 1246d 1246d 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 1 114 14h01m 86d 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 148 13h41m 475d 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 1190d 1338d 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 1492d 1776d 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 2938d 2957d 0/29 closed as dup on 2018/10/02 14:53
linux-6.6 INFO: task hung in jbd2_journal_commit_transaction 1 2 389d 476d 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 2943d 2759d 0/1 public: reported C repro on 2019/04/11 00:00

Sample crash report:
INFO: task jbd2/sda1-8:5114 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:25736 pid:5114  ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5393 [inline]
 __schedule+0x15ae/0x4700 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+0x11/0xd0 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.1.41:5975 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.41        state:D stack:27048 pid:5975  ppid:5782   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5393 [inline]
 __schedule+0x15ae/0x4700 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+0x11/0xd0 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+0x736/0x12d0 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: 0033:0x7f5ed2674332
RSP: 002b:00007fff85894130 EFLAGS: 00010202
RAX: 0000000000005008 RBX: 00007f5ed3555720 RCX: 0000000000000000
RDX: 0000001b2e31f000 RSI: 0000000000000008 RDI: 00007f5ed3555720
RBP: 00000000000000b4 R08: 00007f5ed2a10000 R09: 00007f5ed2a26038
R10: 0000000000000003 R11: 0000000000000003 R12: ffffffff81f807b0
R13: 00007f5ed2a26038 R14: 0000000000000057 R15: ffffffffffffb000
 </TASK>
INFO: task syz.0.51:5976 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.51        state:D stack:27048 pid:5976  ppid:5781   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5393 [inline]
 __schedule+0x15ae/0x4700 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+0x11/0xd0 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+0x736/0x12d0 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: 0033:0x7f2467874332
RSP: 002b:00007ffe66403a40 EFLAGS: 00010202
RAX: 0000000000001008 RBX: 00007f2468755720 RCX: 0000000000000000
RDX: 0000001b2e223000 RSI: 0000000000000008 RDI: 00007f2468755720
RBP: 00000000000003af R08: 00007f2467c10000 R09: 00007f2467c26038
R10: 0000000000000003 R11: 0000000000000002 R12: ffffffff81d2fc6c
R13: 00007f2467c26038 R14: 000000000000016d R15: fffffffffffff000
 </TASK>
INFO: task syz.3.42:5977 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.42        state:D stack:27048 pid:5977  ppid:5780   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5393 [inline]
 __schedule+0x15ae/0x4700 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+0x11/0xd0 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+0x736/0x12d0 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: 0033:0x7f8a2ba74332
RSP: 002b:00007fff8746b030 EFLAGS: 00010202
RAX: 0000000000002008 RBX: 00007f8a2c955720 RCX: 0000000000000000
RDX: 0000001b2e522000 RSI: 0000000000000008 RDI: 00007f8a2c955720
RBP: 0000000000000243 R08: 00007f8a2be10000 R09: 00007f8a2be26038
R10: 0000000000000003 R11: 0000000000000002 R12: ffffffff88d86076
R13: 00007f8a2be26038 R14: 0000000000000056 R15: ffffffffffffe000
 </TASK>
INFO: task syz.2.43:5980 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.43        state:D stack:27048 pid:5980  ppid:5783   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5393 [inline]
 __schedule+0x15ae/0x4700 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+0x11/0xd0 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+0x736/0x12d0 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: 0033:0x7fa685073c09
RSP: 002b:00007ffdee2a8860 EFLAGS: 00010202
RAX: 0000001b2e424000 RBX: 0000000000000000 RCX: 00000000005ffde8
RDX: 0000001b2e423ffc RSI: 00000000005ffde8 RDI: 00007fa685f55700
RBP: 0000000000000000 R08: 0000000000000000 R09: 00007fa685412000
R10: 00007fa685f55700 R11: 0000000000000000 R12: 0000000000000000
R13: 000000000000079c R14: ffffffff813241a0 R15: 00007fa685f55720
 </TASK>

Showing all locks held in the system:
7 locks held by kworker/u4:0/11:
 #0: ffff88801d249138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2632 [inline]
 #0: ffff88801d249138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x975/0x1600 kernel/workqueue.c:2734
 #1: ffffc90000107d00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2632 [inline]
 #1: ffffc90000107d00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x975/0x1600 kernel/workqueue.c:2734
 #2: ffff888021e100e0 (&type->s_umount_key#32){++++}-{3:3}, at: super_trylock_shared+0x20/0xf0 fs/super.c:604
 #3: ffff888021e12c58 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1768 [inline]
 #3: ffff888021e12c58 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1a4/0x350 fs/ext4/inode.c:2821
 #4: ffff888021e14990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1f3f/0x2170 fs/jbd2/transaction.c:448
 #5: ffff888077175288 (&ei->i_data_sem){++++}-{3:3}, at: ext4_map_blocks+0x918/0x1a90 fs/ext4/inode.c:647
 #6: ffffe8ffffc1fa68 (&lg->lg_mutex){+.+.}-{3:3}, at: ext4_mb_group_or_file fs/ext4/mballoc.c:5822 [inline]
 #6: ffffe8ffffc1fa68 (&lg->lg_mutex){+.+.}-{3:3}, at: ext4_mb_initialize_context+0x8af/0xc80 fs/ext4/mballoc.c:5866
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
2 locks held by getty/5534:
 #0: ffff88803380a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000327e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x428/0x1370 drivers/tty/n_tty.c:2217
3 locks held by syz-executor/5768:
 #0: ffff8880265ccda0 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:165 [inline]
 #0: ffff8880265ccda0 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5382 [inline]
 #0: ffff8880265ccda0 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x32/0x2f0 mm/memory.c:5442
 #1: ffff888021e10510 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1634 [inline]
 #1: ffff888021e10510 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs.h:1738 [inline]
 #1: ffff888021e10510 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1e2/0x11a0 fs/ext4/inode.c:6305
 #2: ffff888021e14990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1f3f/0x2170 fs/jbd2/transaction.c:448
3 locks held by syz.1.41/5975:
 #0: ffff88802ef40b20 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:165 [inline]
 #0: ffff88802ef40b20 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5382 [inline]
 #0: ffff88802ef40b20 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x32/0x2f0 mm/memory.c:5442
 #1: ffff888021e10510 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1634 [inline]
 #1: ffff888021e10510 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs.h:1738 [inline]
 #1: ffff888021e10510 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1e2/0x11a0 fs/ext4/inode.c:6305
 #2: ffff888021e14990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1f3f/0x2170 fs/jbd2/transaction.c:448
3 locks held by syz.0.51/5976:
 #0: ffff88802ef473a0 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:165 [inline]
 #0: ffff88802ef473a0 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5382 [inline]
 #0: ffff88802ef473a0 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x32/0x2f0 mm/memory.c:5442
 #1: ffff888021e10510 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1634 [inline]
 #1: ffff888021e10510 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs.h:1738 [inline]
 #1: ffff888021e10510 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1e2/0x11a0 fs/ext4/inode.c:6305
 #2: ffff888021e14990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1f3f/0x2170 fs/jbd2/transaction.c:448
3 locks held by syz.3.42/5977:
 #0: ffff88802ef41e20 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:165 [inline]
 #0: ffff88802ef41e20 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5382 [inline]
 #0: ffff88802ef41e20 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x32/0x2f0 mm/memory.c:5442
 #1: ffff888021e10510 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1634 [inline]
 #1: ffff888021e10510 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs.h:1738 [inline]
 #1: ffff888021e10510 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1e2/0x11a0 fs/ext4/inode.c:6305
 #2: ffff888021e14990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1f3f/0x2170 fs/jbd2/transaction.c:448
3 locks held by syz.2.43/5980:
 #0: ffff8880276614a0 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:165 [inline]
 #0: ffff8880276614a0 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5382 [inline]
 #0: ffff8880276614a0 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x32/0x2f0 mm/memory.c:5442
 #1: ffff888021e10510 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1634 [inline]
 #1: ffff888021e10510 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs.h:1738 [inline]
 #1: ffff888021e10510 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1e2/0x11a0 fs/ext4/inode.c:6305
 #2: ffff888021e14990 (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 10/07/2026
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: 50 Comm: kworker/u4:3 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
RIP: 0010:get_current arch/x86/include/asm/current.h:41 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x60 kernel/kcov.c:211
Code: 00 00 f3 0f 1e fa 53 48 89 fb e8 13 00 00 00 48 8b 3d cc 06 06 0e 48 89 de 5b e9 e3 33 58 00 cc cc cc f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0d 10 e4 7b 7e 65 8b 15 11 e4 7b 7e 81 e2 00 01 ff 00 74
RSP: 0018:ffffc90000baf270 EFLAGS: 00000246
RAX: ffffffff813c00d3 RBX: ffffc90000ba8001 RCX: ffff88801c6e1e00
RDX: 0000000000000000 RSI: ffffc90000baf7f0 RDI: ffffc90000baf880
RBP: 0000000000000001 R08: ffff88801c6e1e00 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000000 R12: ffffc90000baf7f0
R13: ffffc90000baf348 R14: ffffc90000baf880 R15: ffffc90000baf358
FS:  0000000000000000(0000) GS:ffff8880b8c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056362ff45b18 CR3: 000000000df32000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 unwind_next_frame+0x1d03/0x2990 arch/x86/kernel/unwind_orc.c:665
 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_save_free_info+0x28/0x40 mm/kasan/generic.c:522
 ____kasan_slab_free+0x126/0x1f0 mm/kasan/common.c:237
 kasan_slab_free include/linux/kasan.h:164 [inline]
 slab_free_hook mm/slub.c:1833 [inline]
 slab_free_freelist_hook+0x154/0x240 mm/slub.c:1859
 slab_free mm/slub.c:3853 [inline]
 __kmem_cache_free+0xba/0x1f0 mm/slub.c:3866
 batadv_tvlv_container_register+0x131/0x360 net/batman-adv/tvlv.c:256
 batadv_tt_tvlv_container_update+0x572/0x680 net/batman-adv/translation-table.c:1111
 batadv_tt_local_commit_changes_nolock+0xcaf/0xdd0 net/batman-adv/translation-table.c:-1
 batadv_tt_local_commit_changes+0x26/0x40 net/batman-adv/translation-table.c:3790
 batadv_iv_ogm_schedule_buff net/batman-adv/bat_iv_ogm.c:828 [inline]
 batadv_iv_ogm_schedule+0x26e/0x1080 net/batman-adv/bat_iv_ogm.c:907
 batadv_iv_send_outstanding_bat_ogm_packet+0x6ed/0x800 net/batman-adv/bat_iv_ogm.c:1804
 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 (225):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
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
2026/10/01 14:12 linux-6.6.y 79643295eba1 f5cdae2f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/09/30 20:31 linux-6.6.y 79643295eba1 38f7f0d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/09/30 08:24 linux-6.6.y 79643295eba1 7808aef4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/09/30 08:19 linux-6.6.y 79643295eba1 7808aef4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/09/29 19:48 linux-6.6.y 79643295eba1 328436b3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/09/29 02:27 linux-6.6.y 79643295eba1 7bf4ea23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/09/27 17:14 linux-6.6.y 79643295eba1 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/09/26 04:17 linux-6.6.y 79643295eba1 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/09/25 04:42 linux-6.6.y 79643295eba1 f281d9d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in jbd2_journal_commit_transaction
2026/09/24 15:50 linux-6.6.y 79643295eba1 3c3cdf19 .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.