INFO: task syz-executor:5595 blocked in I/O wait 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:22056 pid:5595 tgid:5595 ppid:5594 task_flags:0x440100 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5535 [inline]
__schedule+0x1b47/0x5c60 kernel/sched/core.c:7305
__schedule_loop kernel/sched/core.c:7382 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7397
io_schedule+0x7f/0xd0 kernel/sched/core.c:8069
bit_wait_io+0x13/0x110 kernel/sched/wait_bit.c:258
__wait_on_bit+0xac/0x300 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0x13b/0x190 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:106 [inline]
do_get_write_access+0x658/0x10c0 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d7/0x230 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0xec/0x620 fs/ext4/ext4_jbd2.c:249
ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:6514
__ext4_mark_inode_dirty+0x141/0x7b0 fs/ext4/inode.c:6699
ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:6736
__mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2744
generic_update_time fs/inode.c:2253 [inline]
file_update_time_flags+0x399/0x440 fs/inode.c:2483
ext4_page_mkwrite+0x21f/0x12c0 fs/ext4/inode.c:6902
do_page_mkwrite+0x147/0x310 mm/memory.c:3878
wp_page_shared mm/memory.c:4279 [inline]
do_wp_page+0x1a85/0x4b60 mm/memory.c:4502
handle_pte_fault mm/memory.c:6650 [inline]
__handle_mm_fault mm/memory.c:6775 [inline]
handle_mm_fault+0x15d7/0x3750 mm/memory.c:6942
do_user_addr_fault+0xb35/0x1480 arch/x86/mm/fault.c:1343
handle_page_fault arch/x86/mm/fault.c:1483 [inline]
exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7f5f328701e3
RSP: 002b:00007ffdb5f50800 EFLAGS: 00010202
RAX: 00007f5f2c03feb8 RBX: 00007ffdb5f50930 RCX: 0000000000000000
RDX: 00007f5f2c03feb4 RSI: 0000000000000008 RDI: 00007ffdb5f50930
RBP: 00000000000003e6 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffdb5f50910 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000148 R14: fffffffffffffeb8 R15: 0000000000000000
INFO: task syz.7.728:9633 blocked in I/O wait for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.7.728 state:D stack:25608 pid:9633 tgid:9633 ppid:8872 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5535 [inline]
__schedule+0x1b47/0x5c60 kernel/sched/core.c:7305
__schedule_loop kernel/sched/core.c:7382 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7397
io_schedule+0x7f/0xd0 kernel/sched/core.c:8069
bit_wait_io+0x13/0x110 kernel/sched/wait_bit.c:258
__wait_on_bit+0xac/0x300 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0x13b/0x190 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:106 [inline]
do_get_write_access+0x658/0x10c0 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d7/0x230 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0xec/0x620 fs/ext4/ext4_jbd2.c:249
ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:6514
__ext4_mark_inode_dirty+0x141/0x7b0 fs/ext4/inode.c:6699
ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:6736
__mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2744
generic_update_time fs/inode.c:2253 [inline]
file_update_time_flags+0x399/0x440 fs/inode.c:2483
ext4_page_mkwrite+0x21f/0x12c0 fs/ext4/inode.c:6902
do_page_mkwrite+0x147/0x310 mm/memory.c:3878
do_shared_fault mm/memory.c:6144 [inline]
do_fault mm/memory.c:6206 [inline]
do_pte_missing+0x70f/0x3570 mm/memory.c:4762
handle_pte_fault mm/memory.c:6626 [inline]
__handle_mm_fault mm/memory.c:6775 [inline]
handle_mm_fault+0x1a53/0x3750 mm/memory.c:6942
do_user_addr_fault+0xb35/0x1480 arch/x86/mm/fault.c:1343
handle_page_fault arch/x86/mm/fault.c:1483 [inline]
exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7efc1b072809
RSP: 002b:00007ffec5936060 EFLAGS: 00010202
RAX: 0000001b2e624000 RBX: 0000000000000000 RCX: 00000000003ffde8
RDX: 0000001b2e623ffc RSI: 00000000003ffde8 RDI: 00007efc1bf55700
RBP: 0000000000000000 R08: 0000000000000000 R09: 00007efc1b412000
R10: 00007efc1bf55700 R11: 0000000000000000 R12: 0000000000000000
R13: 000000000000815b R14: ffffffff816d73a0 R15: 00007efc1bf55720
INFO: task syz.2.741:9651 blocked in I/O wait for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.741 state:D stack:25608 pid:9651 tgid:9651 ppid:5608 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5535 [inline]
__schedule+0x1b47/0x5c60 kernel/sched/core.c:7305
__schedule_loop kernel/sched/core.c:7382 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7397
io_schedule+0x7f/0xd0 kernel/sched/core.c:8069
bit_wait_io+0x13/0x110 kernel/sched/wait_bit.c:258
__wait_on_bit+0xac/0x300 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0x13b/0x190 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:106 [inline]
do_get_write_access+0x658/0x10c0 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d7/0x230 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0xec/0x620 fs/ext4/ext4_jbd2.c:249
ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:6514
__ext4_mark_inode_dirty+0x141/0x7b0 fs/ext4/inode.c:6699
ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:6736
__mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2744
generic_update_time fs/inode.c:2253 [inline]
file_update_time_flags+0x399/0x440 fs/inode.c:2483
ext4_page_mkwrite+0x21f/0x12c0 fs/ext4/inode.c:6902
do_page_mkwrite+0x147/0x310 mm/memory.c:3878
do_shared_fault mm/memory.c:6144 [inline]
do_fault mm/memory.c:6206 [inline]
do_pte_missing+0x70f/0x3570 mm/memory.c:4762
handle_pte_fault mm/memory.c:6626 [inline]
__handle_mm_fault mm/memory.c:6775 [inline]
handle_mm_fault+0x1a53/0x3750 mm/memory.c:6942
do_user_addr_fault+0xb35/0x1480 arch/x86/mm/fault.c:1343
handle_page_fault arch/x86/mm/fault.c:1483 [inline]
exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7f7b0da66871
RSP: 002b:00007fffa57a1ac0 EFLAGS: 00010202
RAX: 0000001b32f64000 RBX: 0000000000000000 RCX: 000000000003fde8
RDX: 0000001b32f63fff RSI: 0000000000000008 RDI: 00007f7b0e955720
RBP: 00007f7b0e955720 R08: 0000000000000000 R09: 00007f7b0de26128
R10: 00007f7b0e955700 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000003
INFO: task syz.5.740:9654 blocked in I/O wait for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.740 state:D stack:26936 pid:9654 tgid:9654 ppid:7806 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5535 [inline]
__schedule+0x1b47/0x5c60 kernel/sched/core.c:7305
__schedule_loop kernel/sched/core.c:7382 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7397
io_schedule+0x7f/0xd0 kernel/sched/core.c:8069
bit_wait_io+0x13/0x110 kernel/sched/wait_bit.c:258
__wait_on_bit+0xac/0x300 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0x13b/0x190 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:106 [inline]
do_get_write_access+0x658/0x10c0 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d7/0x230 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0xec/0x620 fs/ext4/ext4_jbd2.c:249
ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:6514
__ext4_mark_inode_dirty+0x141/0x7b0 fs/ext4/inode.c:6699
ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:6736
__mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2744
generic_update_time fs/inode.c:2253 [inline]
touch_atime+0x568/0x670 fs/inode.c:2328
file_accessed include/linux/fs.h:2277 [inline]
ext4_file_mmap_prepare+0x277/0x450 fs/ext4/file.c:901
vfs_mmap_prepare include/linux/fs.h:2069 [inline]
call_mmap_prepare mm/vma.c:2919 [inline]
__mmap_region mm/vma.c:3036 [inline]
mmap_region+0xf11/0x2c30 mm/vma.c:3134
do_mmap+0xe0a/0x1300 mm/mmap.c:573
vm_mmap_pgoff+0x272/0x4e0 mm/util.c:581
ksys_mmap_pgoff+0x4dc/0x760 mm/mmap.c:619
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff51d59dec2
RSP: 002b:00007ffe928c2118 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000001b34464000 RCX: 00007ff51d59dec2
RDX: 0000000000000003 RSI: 00000000003c0000 RDI: 0000001b34464000
RBP: 0000000000100001 R08: 0000000000000004 R09: 0000000000040000
R10: 0000000000100001 R11: 0000000000000206 R12: 000000000000002f
R13: 00000000000927c0 R14: 0000000000060a49 R15: 00007ffe928c23f0
Showing all locks held in the system:
locks held by khungtaskd/34: 1, last CPU#1:
#0: ffffffff8ed5c2a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#0: ffffffff8ed5c2a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8ed5c2a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6871
locks held by kworker/u8:7/1052: 6, on CPU#1:
#0: ffff88801feaa948 ((wq_completion)writeback){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#0: ffff88801feaa948 ((wq_completion)writeback){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffff88801feaa948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3460 [inline]
#0: ffff88801feaa948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3578
#1: ffffc90005327c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#1: ffffc90005327c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#1: ffffc90005327c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3460 [inline]
#1: ffffc90005327c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3578
#2: ffff8880346c80e8 (&type->s_umount_key#34){++++}-{4:4}, at: super_trylock_shared+0x23/0xf0 fs/super.c:670
#3: ffff888034046c98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1f1/0x4e0 fs/ext4/inode.c:3031
#4: ffff888034044938 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
#5: ffff888075cfd3a8 (&ei->i_data_sem#2){++++}-{4:4}, at: ext4_map_blocks+0x77d/0x12c0 fs/ext4/inode.c:822
locks held by getty/5368: 2, on CPU#1:
#0: ffff888035a640a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900032332e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360 drivers/tty/n_tty.c:2211
locks held by syz-executor/5595: 3, on CPU#0:
#0: ffff888074204a88 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:309
#1: ffff8880346c8558 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
#1: ffff8880346c8558 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1fd/0x12c0 fs/ext4/inode.c:6901
#2: ffff888034044938 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
locks held by syz.7.728/9633: 3, on CPU#0:
#0: ffff888025d246c8 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:309
#1: ffff8880346c8558 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
#1: ffff8880346c8558 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1fd/0x12c0 fs/ext4/inode.c:6901
#2: ffff888034044938 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
locks held by syz.2.741/9651: 3, on CPU#0:
#0: ffff8880753ee6c8 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:309
#1: ffff8880346c8558 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
#1: ffff8880346c8558 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1fd/0x12c0 fs/ext4/inode.c:6901
#2: ffff888034044938 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
locks held by syz.5.740/9654: 3, on CPU#0:
#0: ffff88807f52d900 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:548 [inline]
#0: ffff88807f52d900 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1dd/0x4e0 mm/util.c:579
#1: ffff8880346c8460 (sb_writers#4){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2277 [inline]
#1: ffff8880346c8460 (sb_writers#4){.+.+}-{0:0}, at: ext4_file_mmap_prepare+0x277/0x450 fs/ext4/file.c:901
#2: ffff888034044938 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 34 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:123
nmi_trigger_cpumask_backtrace+0x17d/0x390 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+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:377 [inline]
watchdog+0x1058/0x10d0 kernel/hung_task.c:598
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 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: 0 Comm: swapper/0 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:64
Code: 7b 83 02 c3 cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 73 44 1e 00 fb f4 4c 18 03 00 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffffff8ea07ca0 EFLAGS: 00000242
RAX: 0000000000c9646d RBX: ffffffff819c7950 RCX: 8000000000000001
RDX: 0000000000000001 RSI: ffffffff8e418b63 RDI: ffffffff8c6dd480
RBP: ffffffff8ea07d78 R08: ffff8880b8633e5b R09: 1ffff110170c67cb
R10: dffffc0000000000 R11: ffffed10170c67cc R12: 0000000000000000
R13: 1ffffffff1d51df8 R14: 1ffffffff1d40f9c R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff888124cb7000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000565544445168 CR3: 000000000eb46000 CR4: 00000000003526f0
Call Trace:
arch_safe_halt arch/x86/kernel/process.c:767 [inline]
default_idle+0x9/0x20 arch/x86/kernel/process.c:768
default_idle_call+0x72/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:199 [inline]
do_idle+0x2e0/0x540 kernel/sched/idle.c:355
cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:454
rest_init+0x378/0x3a0 init/main.c:729
start_kernel+0x397/0x3e0 init/main.c:1188
x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
x86_64_start_kernel+0x137/0x1b0 arch/x86/kernel/head64.c:291
common_startup_64+0x13e/0x157