INFO: task jbd2/sda1-8:5164 blocked for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:jbd2/sda1-8 state:D stack:26440 pid:5164 tgid:5164 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:5818 blocked for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:23576 pid:5818 tgid:5818 ppid:5817 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:2158
inode_update_time fs/inode.c:2171 [inline]
file_update_time_flags+0x410/0x520 fs/inode.c:2398
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: 0033:0x7f82e8c69065
RSP: 002b:00007ffff0194750 EFLAGS: 00010202
RAX: 00007f82e3b5a748 RBX: 00007ffff0194850 RCX: 0000000000000000
RDX: 00007f82e3b5a744 RSI: 0000000000000008 RDI: 00007ffff0194850
RBP: 00000000000003e6 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffff0194830 R11: 0000000000000000 R12: 0000000000000000
R13: 00000000000a58b8 R14: fffffffffff5a748 R15: 00000000000a58b8
INFO: task syz.0.1278:12092 blocked for more than 144 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.1278 state:D stack:26664 pid:12092 tgid:12092 ppid:5835 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:2158
inode_update_time fs/inode.c:2171 [inline]
file_update_time_flags+0x410/0x520 fs/inode.c:2398
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: 0033:0x7f42ef46f17a
RSP: 002b:00007ffd3f8056a0 EFLAGS: 00010202
RAX: 0000001b312d7000 RBX: 00007f42f0315720 RCX: 0000001b312d6ff8
RDX: 0000001b30d24220 RSI: 0000000000000008 RDI: 00007f42f0315720
RBP: ffffffff81f5d606 R08: 00007f42ef7e6128 R09: 00007f42ef7d2000
R10: 00007f42eebfd008 R11: 0000000000000018 R12: 0000000000000018
R13: 000000000000010f R14: ffffffff81f5d2ba R15: 0000000000000138
INFO: task syz.0.1278:12121 blocked for more than 144 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.1278 state:D stack:26040 pid:12121 tgid:12092 ppid:5835 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
mark_inode_dirty_sync include/linux/fs.h:2200 [inline]
dquot_claim_block include/linux/quotaops.h:363 [inline]
ext4_da_update_reserve_space+0x2b4/0x720 fs/ext4/inode.c:359
ext4_es_insert_extent+0xbd2/0x1120 fs/ext4/extents_status.c:989
ext4_map_create_blocks fs/ext4/inode.c:663 [inline]
ext4_map_blocks+0xad7/0x1350 fs/ext4/inode.c:816
mpage_map_one_extent fs/ext4/inode.c:2380 [inline]
mpage_map_and_submit_extent fs/ext4/inode.c:2474 [inline]
ext4_do_writepages+0x1fa9/0x3c80 fs/ext4/inode.c:2932
ext4_writepages+0x37a/0x7d0 fs/ext4/inode.c:3026
do_writepages+0x27a/0x600 mm/page-writeback.c:2598
filemap_writeback+0x225/0x2d0 mm/filemap.c:387
filemap_fdatawrite_range mm/filemap.c:412 [inline]
file_write_and_wait_range+0xcd/0x140 mm/filemap.c:786
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: 0033:0x7f42ef58f7c9
RSP: 002b:00007f42f0451038 EFLAGS: 00000246 ORIG_RAX: 000000000000001a
RAX: ffffffffffffffda RBX: 00007f42ef7e6270 RCX: 00007f42ef58f7c9
RDX: 0000000400000004 RSI: 01800000000000fe RDI: 000000001ffff000
RBP: 00007f42ef613f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f42ef7e6308 R14: 00007f42ef7e6270 R15: 00007ffd3f805668
INFO: task syz.1.1279:12108 blocked for more than 145 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.1279 state:D stack:25800 pid:12108 tgid:12108 ppid:11116 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:2158
inode_update_time fs/inode.c:2171 [inline]
file_update_time_flags+0x410/0x520 fs/inode.c:2398
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: 0033:0x7f7dcfa6f17a
RSP: 002b:00007ffeff456fe0 EFLAGS: 00010202
RAX: 0000001b3371e000 RBX: 00007f7dd0915720 RCX: 0000001b3371dff8
RDX: 0000001b33324220 RSI: 0000000000000008 RDI: 00007f7dd0915720
RBP: ffffffff845999b0 R08: 00007f7dcfde6308 R09: 00007f7dcfdd2000
R10: 00007f7dcd9f6008 R11: 000000000000000c R12: 000000000000000c
R13: 000000000000005b R14: ffffffff84599ca6 R15: 000000000000005b
INFO: task syz.3.1280:12114 blocked for more than 145 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.1280 state:D stack:26664 pid:12114 tgid:12114 ppid:5840 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:2158
inode_update_time fs/inode.c:2171 [inline]
file_update_time_flags+0x410/0x520 fs/inode.c:2398
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: 0033:0x7fdd02861471
RSP: 002b:00007ffe102621f0 EFLAGS: 00010202
RAX: 0000001b31064000 RBX: 00007fdd03715720 RCX: 0000000000000003
RDX: 0000001b31063fff RSI: 0000000000000008 RDI: 00007fdd03715720
RBP: 00007fdd02be6128 R08: 0000000000000000 R09: 0000000000000000
R10: 00007fdd03715700 R11: 0000000000000000 R12: 00000000fffffc03
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
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
3 locks held by syz-executor/5818:
#0: ffff888028ee6a88 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x117/0x580 mm/mmap_lock.c:259
#1: ffff88814e20c518 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x174/0x380 mm/memory.c:3528
#2: ffff888031ed8950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x5e7/0x1410 fs/jbd2/transaction.c:444
4 locks held by kworker/u8:21/6448:
#0: ffff88801eebb948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x128d/0x1b20 kernel/workqueue.c:3232
#1: ffffc90005267c90 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x914/0x1b20 kernel/workqueue.c:3233
#2: ffff88814e20c0e0 (&type->s_umount_key#33){++++}-{4:4}, at: super_trylock_shared+0x1e/0xf0 fs/super.c:563
#3: ffff88814e20eb98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: do_writepages+0x27a/0x600 mm/page-writeback.c:2598
2 locks held by getty/10457:
#0: ffff8880319b70a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41b/0x1510 drivers/tty/n_tty.c:2211
3 locks held by syz.0.1278/12092:
#0: ffff8880287cd088 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x117/0x580 mm/mmap_lock.c:259
#1: ffff88814e20c518 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x174/0x380 mm/memory.c:3528
#2: ffff888031ed8950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x5e7/0x1410 fs/jbd2/transaction.c:444
3 locks held by syz.0.1278/12121:
#0: ffff88814e20eb98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: do_writepages+0x27a/0x600 mm/page-writeback.c:2598
#1: ffff888031ed8950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x5e7/0x1410 fs/jbd2/transaction.c:444
#2: ffff88807706e2b0 (&ei->i_data_sem){++++}-{4:4}, at: ext4_map_blocks+0x475/0x1350 fs/ext4/inode.c:815
3 locks held by syz.1.1279/12108:
#0: ffff88807b0fd1c8 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x117/0x580 mm/mmap_lock.c:259
#1: ffff88814e20c518 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x174/0x380 mm/memory.c:3528
#2: ffff888031ed8950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x5e7/0x1410 fs/jbd2/transaction.c:444
3 locks held by syz.3.1280/12114:
#0: ffff888078047e48 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x117/0x580 mm/mmap_lock.c:259
#1: ffff88814e20c518 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x174/0x380 mm/memory.c:3528
#2: ffff888031ed8950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x5e7/0x1410 fs/jbd2/transaction.c:444
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
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