INFO: task jbd2/sda1-8:5163 blocked for more than 143 seconds.
Tainted: G U W L XTNJ syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:jbd2/sda1-8 state:D stack:26040 pid:5163 tgid:5163 ppid:2 task_flags:0x240040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x1139/0x6150 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6960
io_schedule+0xbf/0x130 kernel/sched/core.c:7789
bit_wait_io+0x15/0xe0 kernel/sched/wait_bit.c:250
__wait_on_bit+0x65/0x180 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0xd9/0x110 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
__wait_on_buffer+0x64/0x70 fs/buffer.c:123
wait_on_buffer include/linux/buffer_head.h:420 [inline]
jbd2_journal_commit_transaction+0x37d3/0x67f0 fs/jbd2/commit.c:808
kjournald2+0x1f4/0x760 fs/jbd2/journal.c:201
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
INFO: task syz-executor:5817 blocked for more than 143 seconds.
Tainted: G U W L XTNJ syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:22696 pid:5817 tgid:5817 ppid:5816 task_flags:0x440100 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x1139/0x6150 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6960
io_schedule+0xbf/0x130 kernel/sched/core.c:7789
bit_wait_io+0x15/0xe0 kernel/sched/wait_bit.c:250
__wait_on_bit+0x65/0x180 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0xd9/0x110 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
do_get_write_access+0x910/0x12f0 fs/jbd2/transaction.c:1092
jbd2_journal_get_write_access+0x1d6/0x280 fs/jbd2/transaction.c:1242
__ext4_journal_get_write_access+0x6a/0x340 fs/ext4/ext4_jbd2.c:241
ext4_reserve_inode_write+0x1be/0x340 fs/ext4/inode.c:6290
__ext4_mark_inode_dirty+0x197/0x840 fs/ext4/inode.c:6465
ext4_dirty_inode+0xd9/0x130 fs/ext4/inode.c:6502
__mark_inode_dirty+0x1f7/0x1670 fs/fs-writeback.c:2587
generic_update_time+0xcf/0xf0 fs/inode.c:2155
inode_update_time fs/inode.c:2168 [inline]
file_update_time_flags+0x410/0x520 fs/inode.c:2395
ext4_page_mkwrite+0x33d/0x1880 fs/ext4/inode.c:6668
do_page_mkwrite+0x174/0x380 mm/memory.c:3528
do_shared_fault mm/memory.c:5831 [inline]
do_fault+0x3fc/0x1ad0 mm/memory.c:5893
do_pte_missing mm/memory.c:4401 [inline]
handle_pte_fault mm/memory.c:6273 [inline]
__handle_mm_fault+0x1919/0x2bb0 mm/memory.c:6411
handle_mm_fault+0x3fe/0xad0 mm/memory.c:6580
do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1336
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x64/0xc0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f45bc87641f
RSP: 002b:00007ffc81fecdb0 EFLAGS: 00010202
RAX: 00007f45bb8f0000 RBX: 00007ffc81fed2b0 RCX: 0000000000000006
RDX: 1ffffffff163840e RSI: 00005555555d4708 RDI: 0000000000000040
RBP: 000055555566cb90 R08: 00005555555d4738 R09: 0000000000003081
R10: 0000000000000001 R11: 0000000000000246 R12: 00007ffc81fed100
R13: 00007ffc81fecef0 R14: 00007ffc81fed180 R15: 00007ffc81fece10
INFO: task syz.6.5024:27432 blocked for more than 144 seconds.
Tainted: G U W L XTNJ syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.5024 state:D stack:26568 pid:27432 tgid:27425 ppid:24722 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x1139/0x6150 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6960
io_schedule+0xbf/0x130 kernel/sched/core.c:7789
folio_wait_bit_common+0x3d5/0x9e0 mm/filemap.c:1323
folio_wait_writeback+0x3c/0x90 mm/page-writeback.c:3089
__filemap_fdatawait_range+0x11f/0x200 mm/filemap.c:532
file_write_and_wait_range+0x104/0x140 mm/filemap.c:789
ext4_sync_file+0x310/0xeb0 fs/ext4/fsync.c:154
vfs_fsync_range+0x142/0x230 fs/sync.c:188
__do_sys_msync+0x3cb/0x590 mm/msync.c:96
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2a8278f7c9
RSP: 002b:00007f2a83666038 EFLAGS: 00000246 ORIG_RAX: 000000000000001a
RAX: ffffffffffffffda RBX: 00007f2a829e6180 RCX: 00007f2a8278f7c9
RDX: 0000000400000004 RSI: 0180000000000000 RDI: 000000001ffff000
RBP: 00007f2a82813f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2a829e6218 R14: 00007f2a829e6180 R15: 00007ffec6510778
INFO: task syz.5.5028:27443 blocked for more than 144 seconds.
Tainted: G U W L XTNJ syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.5028 state:D stack:26664 pid:27443 tgid:27443 ppid:24310 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x1139/0x6150 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6960
io_schedule+0xbf/0x130 kernel/sched/core.c:7789
bit_wait_io+0x15/0xe0 kernel/sched/wait_bit.c:250
__wait_on_bit+0x65/0x180 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0xd9/0x110 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
do_get_write_access+0x910/0x12f0 fs/jbd2/transaction.c:1092
jbd2_journal_get_write_access+0x1d6/0x280 fs/jbd2/transaction.c:1242
__ext4_journal_get_write_access+0x6a/0x340 fs/ext4/ext4_jbd2.c:241
ext4_reserve_inode_write+0x1be/0x340 fs/ext4/inode.c:6290
__ext4_mark_inode_dirty+0x197/0x840 fs/ext4/inode.c:6465
ext4_dirty_inode+0xd9/0x130 fs/ext4/inode.c:6502
__mark_inode_dirty+0x1f7/0x1670 fs/fs-writeback.c:2587
generic_update_time+0xcf/0xf0 fs/inode.c:2155
inode_update_time fs/inode.c:2168 [inline]
file_update_time_flags+0x410/0x520 fs/inode.c:2395
ext4_page_mkwrite+0x33d/0x1880 fs/ext4/inode.c:6668
do_page_mkwrite+0x174/0x380 mm/memory.c:3528
wp_page_shared mm/memory.c:3929 [inline]
do_wp_page+0xb5d/0x5010 mm/memory.c:4148
handle_pte_fault mm/memory.c:6289 [inline]
__handle_mm_fault+0x1bd2/0x2bb0 mm/memory.c:6411
handle_mm_fault+0x3fe/0xad0 mm/memory.c:6580
do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1336
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x64/0xc0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7ff2c8c6f17a
RSP: 002b:00007ffcf6e977d0 EFLAGS: 00010202
RAX: 0000001b33cf43a0 RBX: 00007ff2c9b15720 RCX: 0000001b33cf4398
RDX: 0000001b33724220 RSI: 0000000000000008 RDI: 00007ff2c9b15720
RBP: ffffffff8939990b R08: 00007ff2c8fe6038 R09: 00007ff2c8fd2000
R10: 00007ff2c87ff008 R11: 000000000000000e R12: 000000000000000e
R13: 0000000000000001 R14: ffffffff89399061 R15: 0000000000000001
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e3c9520 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e3c9520 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff8e3c9520 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6775
1 lock held by dhcpcd/5496:
#0: ffff88807e1f6420 (&type->i_mutex_dir_key#3){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:1042 [inline]
#0: ffff88807e1f6420 (&type->i_mutex_dir_key#3){++++}-{4:4}, at: open_last_lookups fs/namei.c:4539 [inline]
#0: ffff88807e1f6420 (&type->i_mutex_dir_key#3){++++}-{4:4}, at: path_openat+0x1248/0x3140 fs/namei.c:4784
3 locks held by syz-executor/5817:
#0: ffff888031639448 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x117/0x580 mm/mmap_lock.c:259
#1: ffff888035a52518 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x174/0x380 mm/memory.c:3528
#2: ffff888035a56950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x5e7/0x1410 fs/jbd2/transaction.c:444
3 locks held by syz.5.5028/27443:
#0: ffff8880753d4448 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x117/0x580 mm/mmap_lock.c:259
#1: ffff888035a52518 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x174/0x380 mm/memory.c:3528
#2: ffff888035a56950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x5e7/0x1410 fs/jbd2/transaction.c:444
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Tainted: G U W L XTNJ syzkaller #0 PREEMPT(full)
Tainted: [U]=USER, [W]=WARN, [L]=SOFTLOCKUP, [X]=AUX, [T]=RANDSTRUCT, [N]=TEST, [J]=FWCTL
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x133/0x180 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:346 [inline]
watchdog+0xe66/0x1180 kernel/hung_task.c:515
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246