INFO: task syz-executor:5606 blocked in I/O wait for more than 143 seconds.
Tainted: G L Y syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:22640 pid:5606 tgid:5606 ppid:5605 task_flags:0x440100 flags:0x00080800
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x125e/0x6990 kernel/sched/core.c:7382
__schedule_loop kernel/sched/core.c:7459 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7474
io_schedule+0x8a/0xf0 kernel/sched/core.c:8146
bit_wait_io+0xd/0x120 kernel/sched/wait_bit.c:258
__wait_on_bit+0x65/0x180 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0xdc/0x110 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:106 [inline]
do_get_write_access+0x82c/0x1250 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d6/0x280 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0x272/0x370 fs/ext4/ext4_jbd2.c:253
ext4_reserve_inode_write+0x1b7/0x330 fs/ext4/inode.c:7445
__ext4_mark_inode_dirty+0x18a/0x940 fs/ext4/inode.c:7636
ext4_dirty_inode+0xd9/0x130 fs/ext4/inode.c:7673
__mark_inode_dirty+0x1f3/0x16e0 fs/fs-writeback.c:2741
generic_update_time fs/inode.c:2252 [inline]
file_update_time_flags+0x49c/0x520 fs/inode.c:2482
ext4_page_mkwrite+0x30e/0x19e0 fs/ext4/inode.c:7858
do_page_mkwrite+0x17a/0x430 mm/memory.c:3782
wp_page_shared mm/memory.c:4183 [inline]
do_wp_page+0x9ed/0x45b0 mm/memory.c:4406
handle_pte_fault mm/memory.c:6554 [inline]
__handle_mm_fault+0x1cd2/0x2f60 mm/memory.c:6679
handle_mm_fault+0x363/0xa20 mm/memory.c:6846
do_user_addr_fault+0x59c/0x12f0 arch/x86/mm/fault.c:1343
handle_page_fault arch/x86/mm/fault.c:1483 [inline]
exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1536
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7f1029a7dad6
RSP: 002b:00007fff1627ab30 EFLAGS: 00010202
RAX: 00007f1027a1c000 RBX: 000055555903b400 RCX: 0000000000000007
RDX: 00000000000009ac RSI: 000055555903a478 RDI: 0000000000000080
RBP: 00007fff1627b030 R08: 000055555903a498 R09: 00000000000000a0
R10: 0000000000000000 R11: 0000000000000202 R12: 00007fff1627ae70
R13: 00007fff1627ac60 R14: 585858582e7a7973 R15: 00007fff1627abb0
INFO: task syz.7.1804:14456 blocked in I/O wait for more than 143 seconds.
Tainted: G L Y syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.7.1804 state:D stack:27128 pid:14456 tgid:14456 ppid:12629 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x125e/0x6990 kernel/sched/core.c:7382
__schedule_loop kernel/sched/core.c:7459 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7474
io_schedule+0x8a/0xf0 kernel/sched/core.c:8146
bit_wait_io+0xd/0x120 kernel/sched/wait_bit.c:258
__wait_on_bit+0x65/0x180 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0xdc/0x110 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:106 [inline]
do_get_write_access+0x82c/0x1250 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d6/0x280 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0x272/0x370 fs/ext4/ext4_jbd2.c:253
ext4_reserve_inode_write+0x1b7/0x330 fs/ext4/inode.c:7445
__ext4_mark_inode_dirty+0x18a/0x940 fs/ext4/inode.c:7636
ext4_dirty_inode+0xd9/0x130 fs/ext4/inode.c:7673
__mark_inode_dirty+0x1f3/0x16e0 fs/fs-writeback.c:2741
generic_update_time fs/inode.c:2252 [inline]
file_update_time_flags+0x49c/0x520 fs/inode.c:2482
ext4_page_mkwrite+0x30e/0x19e0 fs/ext4/inode.c:7858
do_page_mkwrite+0x17a/0x430 mm/memory.c:3782
do_shared_fault mm/memory.c:6048 [inline]
do_fault+0x659/0x1890 mm/memory.c:6110
do_pte_missing mm/memory.c:4666 [inline]
handle_pte_fault mm/memory.c:6530 [inline]
__handle_mm_fault+0x150b/0x2f60 mm/memory.c:6679
handle_mm_fault+0x363/0xa20 mm/memory.c:6846
do_user_addr_fault+0x59c/0x12f0 arch/x86/mm/fault.c:1343
handle_page_fault arch/x86/mm/fault.c:1483 [inline]
exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1536
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7f8080673ba9
RSP: 002b:00007ffd02e3a010 EFLAGS: 00010202
RAX: 0000001b31e00000 RBX: ffffffff84e94ddf RCX: 0000001b31dffff8
RDX: 0000001b31a24220 RSI: 0000000000000008 RDI: 00007f8081555720
RBP: 0000000000000087 R08: 00007f8080a10000 R09: 00007f8080a12000
R10: 0000000084e94de3 R11: 0000000000000015 R12: 00007f8080a26038
R13: 0000000000000115 R14: ffffffff84e942c5 R15: 00007f8081555720
INFO: task syz.3.1803:14461 blocked in I/O wait for more than 143 seconds.
Tainted: G L Y syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.1803 state:D stack:27128 pid:14461 tgid:14461 ppid:13810 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x125e/0x6990 kernel/sched/core.c:7382
__schedule_loop kernel/sched/core.c:7459 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7474
io_schedule+0x8a/0xf0 kernel/sched/core.c:8146
bit_wait_io+0xd/0x120 kernel/sched/wait_bit.c:258
__wait_on_bit+0x65/0x180 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0xdc/0x110 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:106 [inline]
do_get_write_access+0x82c/0x1250 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d6/0x280 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0x272/0x370 fs/ext4/ext4_jbd2.c:253
ext4_reserve_inode_write+0x1b7/0x330 fs/ext4/inode.c:7445
__ext4_mark_inode_dirty+0x18a/0x940 fs/ext4/inode.c:7636
ext4_dirty_inode+0xd9/0x130 fs/ext4/inode.c:7673
__mark_inode_dirty+0x1f3/0x16e0 fs/fs-writeback.c:2741
generic_update_time fs/inode.c:2252 [inline]
file_update_time_flags+0x49c/0x520 fs/inode.c:2482
ext4_page_mkwrite+0x30e/0x19e0 fs/ext4/inode.c:7858
do_page_mkwrite+0x17a/0x430 mm/memory.c:3782
do_shared_fault mm/memory.c:6048 [inline]
do_fault+0x659/0x1890 mm/memory.c:6110
do_pte_missing mm/memory.c:4666 [inline]
handle_pte_fault mm/memory.c:6530 [inline]
__handle_mm_fault+0x150b/0x2f60 mm/memory.c:6679
handle_mm_fault+0x363/0xa20 mm/memory.c:6846
do_user_addr_fault+0x59c/0x12f0 arch/x86/mm/fault.c:1343
handle_page_fault arch/x86/mm/fault.c:1483 [inline]
exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1536
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7fb67d273c09
RSP: 002b:00007fff78550290 EFLAGS: 00010202
RAX: 0000001b33b24000 RBX: 0000000000000000 RCX: 00000000003ffde8
RDX: 0000001b33b23ffc RSI: 00000000003ffde8 RDI: 00007fb67e155700
RBP: 0000000000000000 R08: 0000000000000000 R09: 00007fb67d612000
R10: 00007fb67e155700 R11: 0000000000000000 R12: 0000000000000000
R13: 000000000001657c R14: ffffffff81b0d6a6 R15: 00007fb67e155720
INFO: task syz.0.1808:14472 blocked in I/O wait for more than 143 seconds.
Tainted: G L Y syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.1808 state:D stack:23024 pid:14472 tgid:14472 ppid:5617 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x125e/0x6990 kernel/sched/core.c:7382
__schedule_loop kernel/sched/core.c:7459 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7474
io_schedule+0x8a/0xf0 kernel/sched/core.c:8146
bit_wait_io+0xd/0x120 kernel/sched/wait_bit.c:258
__wait_on_bit+0x65/0x180 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0xdc/0x110 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:106 [inline]
do_get_write_access+0x82c/0x1250 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d6/0x280 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0x272/0x370 fs/ext4/ext4_jbd2.c:253
ext4_reserve_inode_write+0x1b7/0x330 fs/ext4/inode.c:7445
__ext4_mark_inode_dirty+0x18a/0x940 fs/ext4/inode.c:7636
ext4_dirty_inode+0xd9/0x130 fs/ext4/inode.c:7673
__mark_inode_dirty+0x1f3/0x16e0 fs/fs-writeback.c:2741
generic_update_time fs/inode.c:2252 [inline]
file_update_time_flags+0x49c/0x520 fs/inode.c:2482
ext4_page_mkwrite+0x30e/0x19e0 fs/ext4/inode.c:7858
do_page_mkwrite+0x17a/0x430 mm/memory.c:3782
do_shared_fault mm/memory.c:6048 [inline]
do_fault+0x659/0x1890 mm/memory.c:6110
do_pte_missing mm/memory.c:4666 [inline]
handle_pte_fault mm/memory.c:6530 [inline]
__handle_mm_fault+0x150b/0x2f60 mm/memory.c:6679
handle_mm_fault+0x363/0xa20 mm/memory.c:6846
do_user_addr_fault+0x59c/0x12f0 arch/x86/mm/fault.c:1343
handle_page_fault arch/x86/mm/fault.c:1483 [inline]
exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1536
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7fafeca73ba9
RSP: 002b:00007ffda49794c0 EFLAGS: 00010202
RAX: 0000001b33e1b000 RBX: ffffffff89acf1d5 RCX: 0000001b33e1aff8
RDX: 0000001b3382421c RSI: 0000000000000008 RDI: 00007fafed955720
RBP: 00000000000001bc R08: 00007fafece10000 R09: 00007fafece12000
R10: 0000000089acf1d9 R11: 0000000000000003 R12: 00007fafece26038
R13: 0000000000000202 R14: ffffffff89acf632 R15: 00007fafed955720
INFO: task syz.5.1809:14474 blocked in I/O wait for more than 143 seconds.
Tainted: G L Y syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.1809 state:D stack:27064 pid:14474 tgid:14474 ppid:6411 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x125e/0x6990 kernel/sched/core.c:7382
__schedule_loop kernel/sched/core.c:7459 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7474
io_schedule+0x8a/0xf0 kernel/sched/core.c:8146
bit_wait_io+0xd/0x120 kernel/sched/wait_bit.c:258
__wait_on_bit+0x65/0x180 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0xdc/0x110 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:106 [inline]
do_get_write_access+0x82c/0x1250 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d6/0x280 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0x272/0x370 fs/ext4/ext4_jbd2.c:253
ext4_reserve_inode_write+0x1b7/0x330 fs/ext4/inode.c:7445
__ext4_mark_inode_dirty+0x18a/0x940 fs/ext4/inode.c:7636
ext4_dirty_inode+0xd9/0x130 fs/ext4/inode.c:7673
__mark_inode_dirty+0x1f3/0x16e0 fs/fs-writeback.c:2741
generic_update_time fs/inode.c:2252 [inline]
file_update_time_flags+0x49c/0x520 fs/inode.c:2482
ext4_page_mkwrite+0x30e/0x19e0 fs/ext4/inode.c:7858
do_page_mkwrite+0x17a/0x430 mm/memory.c:3782
do_shared_fault mm/memory.c:6048 [inline]
do_fault+0x659/0x1890 mm/memory.c:6110
do_pte_missing mm/memory.c:4666 [inline]
handle_pte_fault mm/memory.c:6530 [inline]
__handle_mm_fault+0x150b/0x2f60 mm/memory.c:6679
handle_mm_fault+0x363/0xa20 mm/memory.c:6846
do_user_addr_fault+0x59c/0x12f0 arch/x86/mm/fault.c:1343
handle_page_fault arch/x86/mm/fault.c:1483 [inline]
exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1536
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7fbb54674332
RSP: 002b:00007fff83eece20 EFLAGS: 00010202
RAX: 0000000000018008 RBX: 00007fbb55555720 RCX: 0000000000000000
RDX: 0000001b2d60c000 RSI: 0000000000000008 RDI: 00007fbb55555720
RBP: 0000000000000656 R08: 00007fbb54a10000 R09: 00007fbb54a26128
R10: 0000000000000003 R11: 000000000000000f R12: ffffffff8be507b1
R13: 00007fbb54a26128 R14: 00000000000000ea R15: fffffffffffe8000
Showing all locks held in the system:
locks held by khungtaskd/32: 1, last CPU#1:
#0: ffffffff8ffeb520 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#0: ffffffff8ffeb520 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8ffeb520 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x3d/0x184 kernel/locking/lockdep.c:6871
locks held by getty/5381: 2, on CPU#1:
#0: ffff88802d3060a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc9000322e2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x419/0x1540 drivers/tty/n_tty.c:2211
locks held by syz-executor/5606: 3, on CPU#1:
#0: ffff888035c44588 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x11d/0x590 mm/mmap_lock.c:309
#1: ffff888039cba558 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x17a/0x430 mm/memory.c:3782
#2: ffff888039cb8950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfa2/0x1390 fs/jbd2/transaction.c:444
locks held by syz-executor/14226: 2, on CPU#1:
#0: ffff888039cba460 (sb_writers#5){.+.+}-{0:0}, at: filename_create+0x10d/0x400 fs/namei.c:5095
#1: ffff888057e195a0 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1069 [inline]
#1: ffff888057e195a0 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: __start_dirop fs/namei.c:2918 [inline]
#1: ffff888057e195a0 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: start_dirop fs/namei.c:2942 [inline]
#1: ffff888057e195a0 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x1c0/0x400 fs/namei.c:5102
locks held by syz.7.1804/14456: 3, on CPU#1:
#0: ffff88802b919bc8 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x11d/0x590 mm/mmap_lock.c:309
#1: ffff888039cba558 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x17a/0x430 mm/memory.c:3782
#2: ffff888039cb8950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfa2/0x1390 fs/jbd2/transaction.c:444
locks held by syz.3.1803/14461: 3, on CPU#0:
#0: ffff88807c679a88 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x11d/0x590 mm/mmap_lock.c:309
#1: ffff888039cba558 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x17a/0x430 mm/memory.c:3782
#2: ffff888039cb8950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfa2/0x1390 fs/jbd2/transaction.c:444
locks held by syz.0.1808/14472: 3, on CPU#1:
#0: ffff888037c71808 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x11d/0x590 mm/mmap_lock.c:309
#1: ffff888039cba558 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x17a/0x430 mm/memory.c:3782
#2: ffff888039cb8950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfa2/0x1390 fs/jbd2/transaction.c:444
locks held by syz.5.1809/14474: 3, on CPU#0:
#0: ffff8880393041c8 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x11d/0x590 mm/mmap_lock.c:309
#1: ffff888039cba558 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x17a/0x430 mm/memory.c:3782
#2: ffff888039cb8950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfa2/0x1390 fs/jbd2/transaction.c:444
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 32 Comm: khungtaskd Tainted: G L Y syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP, [Y]=FORCED_BIND
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
nmi_cpu_backtrace.cold+0x12d/0x151 lib/nmi_backtrace.c:123
nmi_trigger_cpumask_backtrace+0x21f/0x2a0 lib/nmi_backtrace.c:66
trigger_all_cpu_backtrace include/linux/nmi.h:164 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x141/0x190 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
watchdog+0xcb1/0x1030 kernel/hung_task.c:561
kthread+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: pr/ttyS0 Tainted: G L Y syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP, [Y]=FORCED_BIND
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
RIP: 0010:io_serial_in+0x87/0xb0 drivers/tty/serial/8250/8250_port.c:426
Code: 04 4f fc 48 8d 7d 40 44 89 e1 48 b8 00 00 00 00 00 fc ff df 48 89 fa d3 e3 48 c1 ea 03 80 3c 02 00 75 1a 66 03 5d 40 89 da ec <5b> 0f b6 c0 5d 41 5c c3 cc cc cc cc e8 38 19 c8 fc eb a2 e8 c1 19
RSP: 0018:ffffc90000a77a40 EFLAGS: 00000006
RAX: dffffc0000000005 RBX: 00000000000003f9 RCX: 0000000000000000
RDX: 00000000000003f9 RSI: ffffffff85bf1900 RDI: ffffffff9cf2b240
RBP: ffffffff9cf2b200 R08: 0000000000000001 R09: 000000000000001f
R10: 0000000000000000 R11: 205d323354202020 R12: 0000000000000000
R13: 1ffff9200014ef52 R14: 0000000000000063 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88812249c000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000560ea90ba168 CR3: 000000000fd96000 CR4: 00000000003526f0
Call Trace:
serial_port_in include/linux/serial_core.h:812 [inline]
serial8250_console_write+0xfa/0x14f0 drivers/tty/serial/8250/8250_port.c:3483
nbcon_emit_next_record+0x8f7/0xa70 kernel/printk/nbcon.c:1070
nbcon_emit_one+0x1a8/0x2b0 kernel/printk/nbcon.c:1157
nbcon_kthread_func+0x5ef/0x7f0 kernel/printk/nbcon.c:1271
kthread+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245