INFO: task syz-executor:5605 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:21968 pid:5605  tgid:5605  ppid:5604   task_flags:0x440100 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5527 [inline]
 __schedule+0x17dd/0x5940 kernel/sched/core.c:7295
 __schedule_loop kernel/sched/core.c:7372 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7387
 io_schedule+0x7f/0xd0 kernel/sched/core.c:8043
 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:2729
 generic_update_time fs/inode.c:2254 [inline]
 file_update_time_flags+0x399/0x440 fs/inode.c:2484
 ext4_page_mkwrite+0x21f/0x12c0 fs/ext4/inode.c:6902
 do_page_mkwrite+0x147/0x310 mm/memory.c:3779
 wp_page_shared mm/memory.c:4180 [inline]
 do_wp_page+0x1a97/0x4b70 mm/memory.c:4403
 handle_pte_fault mm/memory.c:6551 [inline]
 __handle_mm_fault mm/memory.c:6676 [inline]
 handle_mm_fault+0x15d7/0x3750 mm/memory.c:6843
 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: 0033:0x7fdf8e8701e3
RSP: 002b:00007ffd76da72c0 EFLAGS: 00010202
RAX: 00007fdf873f9d60 RBX: 00007ffd76da73f0 RCX: 0000000000000000
RDX: 00007fdf873f9d5c RSI: 0000000000000008 RDI: 00007ffd76da73f0
RBP: 00000000000003e6 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffd76da73d0 R11: 0000000000000000 R12: 0000000000000000
R13: 00000000000062a0 R14: ffffffffffff9d60 R15: 0000000000000000
 </TASK>
INFO: task syz.2.258:6593 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.2.258       state:D stack:25096 pid:6593  tgid:6593  ppid:5624   task_flags:0x440040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5527 [inline]
 __schedule+0x17dd/0x5940 kernel/sched/core.c:7295
 __schedule_loop kernel/sched/core.c:7372 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7387
 io_schedule+0x7f/0xd0 kernel/sched/core.c:8043
 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:2729
 generic_update_time fs/inode.c:2254 [inline]
 file_update_time_flags+0x399/0x440 fs/inode.c:2484
 ext4_page_mkwrite+0x21f/0x12c0 fs/ext4/inode.c:6902
 do_page_mkwrite+0x147/0x310 mm/memory.c:3779
 do_shared_fault mm/memory.c:6045 [inline]
 do_fault mm/memory.c:6107 [inline]
 do_pte_missing+0x757/0x34b0 mm/memory.c:4663
 handle_pte_fault mm/memory.c:6527 [inline]
 __handle_mm_fault mm/memory.c:6676 [inline]
 handle_mm_fault+0x1a53/0x3750 mm/memory.c:6843
 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: 0033:0x7f3f61e727a9
RSP: 002b:00007ffc28f927e0 EFLAGS: 00010202
RAX: 0000001b33e22000 RBX: ffffffff848df99e RCX: 0000001b33e21ff8
RDX: 0000001b3382421c RSI: 0000000000000008 RDI: 00007f3f62d55720
RBP: 0000000000000197 R08: 00007f3f62210000 R09: 00007f3f62212000
R10: 00000000848df9a2 R11: 0000000000000002 R12: 00007f3f62226038
R13: 00000000000005f0 R14: ffffffff848dff14 R15: 00007f3f62d55720
 </TASK>
INFO: task syz.0.262:6603 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.0.262       state:D stack:25608 pid:6603  tgid:6603  ppid:5626   task_flags:0x440040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5527 [inline]
 __schedule+0x17dd/0x5940 kernel/sched/core.c:7295
 __schedule_loop kernel/sched/core.c:7372 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7387
 io_schedule+0x7f/0xd0 kernel/sched/core.c:8043
 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:2729
 generic_update_time fs/inode.c:2254 [inline]
 file_update_time_flags+0x399/0x440 fs/inode.c:2484
 ext4_page_mkwrite+0x21f/0x12c0 fs/ext4/inode.c:6902
 do_page_mkwrite+0x147/0x310 mm/memory.c:3779
 do_shared_fault mm/memory.c:6045 [inline]
 do_fault mm/memory.c:6107 [inline]
 do_pte_missing+0x757/0x34b0 mm/memory.c:4663
 handle_pte_fault mm/memory.c:6527 [inline]
 __handle_mm_fault mm/memory.c:6676 [inline]
 handle_mm_fault+0x1a53/0x3750 mm/memory.c:6843
 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: 0033:0x7f626b8727a9
RSP: 002b:00007ffcc780b390 EFLAGS: 00010202
RAX: 0000001b33c1b000 RBX: ffffffff8be0e006 RCX: 0000001b33c1aff8
RDX: 0000001b33624224 RSI: 0000000000000008 RDI: 00007f626c755720
RBP: 000000000000074f R08: 00007f626bc10000 R09: 00007f626bc12000
R10: 000000008be0e00a R11: 0000000000000006 R12: 00007f626bc26038
R13: 000000000007c6c6 R14: ffffffff8be0e4f6 R15: 00007f626c755720
 </TASK>
INFO: task syz.3.263:6613 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.3.263       state:D stack:27224 pid:6613  tgid:6613  ppid:5615   task_flags:0x440040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5527 [inline]
 __schedule+0x17dd/0x5940 kernel/sched/core.c:7295
 __schedule_loop kernel/sched/core.c:7372 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7387
 io_schedule+0x7f/0xd0 kernel/sched/core.c:8043
 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:2729
 generic_update_time fs/inode.c:2254 [inline]
 touch_atime+0x568/0x670 fs/inode.c:2329
 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:2776 [inline]
 __mmap_region mm/vma.c:2865 [inline]
 mmap_region+0xe7e/0x2270 mm/vma.c:2966
 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: 0033:0x7f10ea19dec2
RSP: 002b:00007ffcd9605368 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000001b33964000 RCX: 00007f10ea19dec2
RDX: 0000000000000003 RSI: 00000000005c0000 RDI: 0000001b33964000
RBP: 0000000000100001 R08: 0000000000000004 R09: 0000000000040000
R10: 0000000000100001 R11: 0000000000000206 R12: 000000000000002e
R13: 00000000000927c0 R14: 000000000001fbb7 R15: 00007ffcd9605640
 </TASK>

Showing all locks held in the system:
locks held by khungtaskd/32: 1, last CPU#1:
 #0: ffffffff8ed5c7a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffffffff8ed5c7a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8ed5c7a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6871
locks held by kworker/u8:4/59: 6, on CPU#0:
 #0: ffff888020ebf940 ((wq_completion)writeback){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffff888020ebf940 ((wq_completion)writeback){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffff888020ebf940 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3364 [inline]
 #0: ffff888020ebf940 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3482
 #1: ffffc9000200fc40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #1: ffffc9000200fc40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #1: ffffc9000200fc40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3364 [inline]
 #1: ffffc9000200fc40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3482
 #2: ffff88807fca20e8 (&type->s_umount_key#33){++++}-{4:4}, at: super_trylock_shared+0x23/0xf0 fs/super.c:674
 #3: ffff88807fca0c98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1f1/0x4e0 fs/ext4/inode.c:3031
 #4: ffff88807fcb6938 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
 #5: ffff888034595cb8 (&ei->i_data_sem#2){++++}-{4:4}, at: ext4_map_blocks+0x77d/0x12c0 fs/ext4/inode.c:822
locks held by getty/5376: 2, on CPU#0:
 #0: ffff8880355ff0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000322b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360 drivers/tty/n_tty.c:2211
locks held by syz-executor/5605: 3, on CPU#1:
 #0: ffff8880742cb588 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:309
 #1: ffff88807fca2558 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
 #1: ffff88807fca2558 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1fd/0x12c0 fs/ext4/inode.c:6901
 #2: ffff88807fcb6938 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
locks held by syz.2.258/6593: 3, on CPU#1:
 #0: ffff88803383f088 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:309
 #1: ffff88807fca2558 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
 #1: ffff88807fca2558 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1fd/0x12c0 fs/ext4/inode.c:6901
 #2: ffff88807fcb6938 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
locks held by syz.0.262/6603: 3, on CPU#1:
 #0: ffff88804a8dea88 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:309
 #1: ffff88807fca2558 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
 #1: ffff88807fca2558 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1fd/0x12c0 fs/ext4/inode.c:6901
 #2: ffff88807fcb6938 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
locks held by syz.3.263/6613: 3, on CPU#1:
 #0: ffff88801c381078 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:548 [inline]
 #0: ffff88801c381078 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1dd/0x4e0 mm/util.c:579
 #1: ffff88807fca2460 (sb_writers#4){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2277 [inline]
 #1: ffff88807fca2460 (sb_writers#4){.+.+}-{0:0}, at: ext4_file_mmap_prepare+0x277/0x450 fs/ext4/file.c:901
 #2: ffff88807fcb6938 (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: 32 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:
 <TASK>
 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
 </TASK>
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: ac 8d 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 93 51 22 00 fb f4 <e9> 8c 10 03 00 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffffff8ea07ca0 EFLAGS: 00000246
RAX: 0000000000190c17 RBX: ffffffff819bae40 RCX: 8000000000000001
RDX: 0000000000000001 RSI: ffffffff8e4797e2 RDI: ffffffff8c6da580
RBP: ffffffff8ea07d78 R08: ffff8880b8633a1b R09: 1ffff110170c6743
R10: dffffc0000000000 R11: ffffed10170c6744 R12: 0000000000000000
R13: 1ffffffff1d51df8 R14: 1ffffffff1d40f9c R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888124cc0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000564f6a18f660 CR3: 000000000eb48000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 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:727
 start_kernel+0x392/0x3e0 init/main.c:1185
 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
 </TASK>