INFO: task kworker/u8:11:1448 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:kworker/u8:11   state:D stack:21448 pid:1448  tgid:1448  ppid:2      task_flags:0x4248060 flags:0x00080000
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x171d/0x56e0 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7474
 io_schedule+0x80/0xe0 kernel/sched/core.c:8146
 bit_wait_io+0x13/0x110 kernel/sched/wait_bit.c:258
 __wait_on_bit+0xac/0x2f0 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+0x667/0x10d0 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:6511
 __ext4_mark_inode_dirty+0x141/0x7b0 fs/ext4/inode.c:6696
 ext4_ext_insert_extent+0x26f5/0x4bf0 fs/ext4/extents.c:2210
 ext4_ext_map_blocks+0x1575/0x5680 fs/ext4/extents.c:4490
 ext4_map_create_blocks+0x116/0x530 fs/ext4/inode.c:630
 ext4_map_blocks+0x791/0x12c0 fs/ext4/inode.c:823
 mpage_map_one_extent fs/ext4/inode.c:2379 [inline]
 mpage_map_and_submit_extent fs/ext4/inode.c:2469 [inline]
 ext4_do_writepages+0x239b/0x4770 fs/ext4/inode.c:2938
 ext4_writepages+0x1fe/0x4e0 fs/ext4/inode.c:3032
 do_writepages+0x338/0x560 mm/page-writeback.c:2560
 __writeback_single_inode+0x136/0x1230 fs/fs-writeback.c:1800
 writeback_sb_inodes+0x9db/0x1aa0 fs/fs-writeback.c:2111
 __writeback_inodes_wb+0x114/0x240 fs/fs-writeback.c:2187
 wb_writeback+0x42f/0xad0 fs/fs-writeback.c:2298
 wb_check_old_data_flush fs/fs-writeback.c:2402 [inline]
 wb_do_writeback fs/fs-writeback.c:2481 [inline]
 wb_workfn+0xc98/0x10f0 fs/fs-writeback.c:2509
 process_one_work kernel/workqueue.c:3396 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
 kthread+0x38b/0x470 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>
INFO: task jbd2/sda1-8:4912 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:jbd2/sda1-8     state:D stack:25192 pid:4912  tgid:4912  ppid:2      task_flags:0x240040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x171d/0x56e0 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7474
 io_schedule+0x80/0xe0 kernel/sched/core.c:8146
 bit_wait_io+0x13/0x110 kernel/sched/wait_bit.c:258
 __wait_on_bit+0xac/0x2f0 kernel/sched/wait_bit.c:52
 out_of_line_wait_on_bit+0x13b/0x190 kernel/sched/wait_bit.c:67
 wait_on_buffer include/linux/buffer_head.h:482 [inline]
 jbd2_journal_commit_transaction+0x2f77/0x5cb0 fs/jbd2/commit.c:834
 kjournald2+0x3bc/0x740 fs/jbd2/journal.c:200
 kthread+0x38b/0x470 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>
INFO: task syz-executor:5570 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:21896 pid:5570  tgid:5570  ppid:5568   task_flags:0x440100 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x171d/0x56e0 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7474
 io_schedule+0x80/0xe0 kernel/sched/core.c:8146
 bit_wait_io+0x13/0x110 kernel/sched/wait_bit.c:258
 __wait_on_bit+0xac/0x2f0 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+0x667/0x10d0 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:6511
 __ext4_mark_inode_dirty+0x141/0x7b0 fs/ext4/inode.c:6696
 ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:6733
 __mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2741
 generic_update_time fs/inode.c:2252 [inline]
 file_update_time_flags+0x39f/0x450 fs/inode.c:2482
 ext4_page_mkwrite+0x220/0x12c0 fs/ext4/inode.c:6899
 do_page_mkwrite+0x14a/0x310 mm/memory.c:3816
 wp_page_shared mm/memory.c:4217 [inline]
 do_wp_page+0x209d/0x3d10 mm/memory.c:4440
 handle_pte_fault mm/memory.c:6582 [inline]
 __handle_mm_fault mm/memory.c:6707 [inline]
 handle_mm_fault+0xd69/0x28c0 mm/memory.c:6876
 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: 0033:0x7fa73639dad6
RSP: 002b:00007fff4c06e140 EFLAGS: 00010202
RAX: 00007fa73438c000 RBX: 000055557e5e5e20 RCX: 0000000000000001
RDX: 0000000000001170 RSI: 000055557e5ee258 RDI: 0000000000000002
RBP: 00007fff4c06e640 R08: 000055557e5ee448 R09: 000000000000009b
R10: 0000000000000000 R11: 0000000000000202 R12: 00007fff4c06e480
R13: 00007fff4c06e270 R14: 585858582e7a7973 R15: 00007fff4c06e1c0
 </TASK>
INFO: task syz.0.2344:11545 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.0.2344      state:D stack:25768 pid:11545 tgid:11545 ppid:5587   task_flags:0x440040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x171d/0x56e0 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7474
 io_schedule+0x80/0xe0 kernel/sched/core.c:8146
 bit_wait_io+0x13/0x110 kernel/sched/wait_bit.c:258
 __wait_on_bit+0xac/0x2f0 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+0x667/0x10d0 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:6511
 __ext4_mark_inode_dirty+0x141/0x7b0 fs/ext4/inode.c:6696
 ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:6733
 __mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2741
 generic_update_time fs/inode.c:2252 [inline]
 file_update_time_flags+0x39f/0x450 fs/inode.c:2482
 ext4_page_mkwrite+0x220/0x12c0 fs/ext4/inode.c:6899
 do_page_mkwrite+0x14a/0x310 mm/memory.c:3816
 do_shared_fault mm/memory.c:6076 [inline]
 do_fault mm/memory.c:6138 [inline]
 do_pte_missing+0x734/0x28f0 mm/memory.c:4700
 handle_pte_fault mm/memory.c:6558 [inline]
 __handle_mm_fault mm/memory.c:6707 [inline]
 handle_mm_fault+0xf64/0x28c0 mm/memory.c:6876
 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: 0033:0x7fcc2d063c09
RSP: 002b:00007ffc215dbb40 EFLAGS: 00010202
RAX: 0000001b31724000 RBX: 0000000000000000 RCX: 00000000003ffde8
RDX: 0000001b31723ffc RSI: 00000000003ffde8 RDI: 00007fcc2df45700
RBP: 0000000000000000 R08: 0000000000000000 R09: 00007fcc2d402000
R10: 00007fcc2df45700 R11: 0000000000000000 R12: 0000000000000000
R13: 000000000000a484 R14: ffffffff816d8480 R15: 00007fcc2df45720
 </TASK>
INFO: task syz.4.2345:11549 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.4.2345      state:D stack:23600 pid:11549 tgid:11549 ppid:5585   task_flags:0x440040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x171d/0x56e0 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7474
 io_schedule+0x80/0xe0 kernel/sched/core.c:8146
 bit_wait_io+0x13/0x110 kernel/sched/wait_bit.c:258
 __wait_on_bit+0xac/0x2f0 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+0x667/0x10d0 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:6511
 __ext4_mark_inode_dirty+0x141/0x7b0 fs/ext4/inode.c:6696
 ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:6733
 __mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2741
 generic_update_time fs/inode.c:2252 [inline]
 file_update_time_flags+0x39f/0x450 fs/inode.c:2482
 ext4_page_mkwrite+0x220/0x12c0 fs/ext4/inode.c:6899
 do_page_mkwrite+0x14a/0x310 mm/memory.c:3816
 do_shared_fault mm/memory.c:6076 [inline]
 do_fault mm/memory.c:6138 [inline]
 do_pte_missing+0x734/0x28f0 mm/memory.c:4700
 handle_pte_fault mm/memory.c:6558 [inline]
 __handle_mm_fault mm/memory.c:6707 [inline]
 handle_mm_fault+0xf64/0x28c0 mm/memory.c:6876
 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: 0033:0x7f9c15c94332
RSP: 002b:00007ffda1d2eee0 EFLAGS: 00010202
RAX: 0000000000003008 RBX: 00007f9c16b75720 RCX: 0000000000000000
RDX: 0000001b31d21000 RSI: 0000000000000008 RDI: 00007f9c16b75720
RBP: 00000000000006ac R08: 00007f9c16030000 R09: 00007f9c16046038
R10: 0000000000000003 R11: 0000000000000002 R12: ffffffff8b5b5c27
R13: 00007f9c16046038 R14: 0000000000000025 R15: ffffffffffffd000
 </TASK>
INFO: task syz.5.2348:11554 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.5.2348      state:D stack:24624 pid:11554 tgid:11554 ppid:10480  task_flags:0x440040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x171d/0x56e0 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7474
 io_schedule+0x80/0xe0 kernel/sched/core.c:8146
 bit_wait_io+0x13/0x110 kernel/sched/wait_bit.c:258
 __wait_on_bit+0xac/0x2f0 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+0x667/0x10d0 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:6511
 __ext4_mark_inode_dirty+0x141/0x7b0 fs/ext4/inode.c:6696
 ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:6733
 __mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2741
 generic_update_time fs/inode.c:2252 [inline]
 file_update_time_flags+0x39f/0x450 fs/inode.c:2482
 ext4_page_mkwrite+0x220/0x12c0 fs/ext4/inode.c:6899
 do_page_mkwrite+0x14a/0x310 mm/memory.c:3816
 do_shared_fault mm/memory.c:6076 [inline]
 do_fault mm/memory.c:6138 [inline]
 do_pte_missing+0x734/0x28f0 mm/memory.c:4700
 handle_pte_fault mm/memory.c:6558 [inline]
 __handle_mm_fault mm/memory.c:6707 [inline]
 handle_mm_fault+0xf64/0x28c0 mm/memory.c:6876
 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: 0033:0x7f5069894332
RSP: 002b:00007ffe92002b50 EFLAGS: 00010202
RAX: 0000000000001008 RBX: 00007f506a775720 RCX: 0000000000000000
RDX: 0000001b33423000 RSI: 0000000000000008 RDI: 00007f506a775720
RBP: 0000000000000627 R08: 00007f5069c30000 R09: 00007f5069c46038
R10: 0000000000000007 R11: 0000000000000001 R12: ffffffff8486ded7
R13: 00007f5069c46038 R14: 00000000000001ea R15: fffffffffffff000
 </TASK>
INFO: task syz.1.2350:11560 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.1.2350      state:D stack:26184 pid:11560 tgid:11560 ppid:5586   task_flags:0x440040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x171d/0x56e0 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7474
 io_schedule+0x80/0xe0 kernel/sched/core.c:8146
 bit_wait_io+0x13/0x110 kernel/sched/wait_bit.c:258
 __wait_on_bit+0xac/0x2f0 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+0x667/0x10d0 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:6511
 __ext4_mark_inode_dirty+0x141/0x7b0 fs/ext4/inode.c:6696
 ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:6733
 __mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2741
 generic_update_time fs/inode.c:2252 [inline]
 touch_atime+0x568/0x670 fs/inode.c:2327
 file_accessed include/linux/fs.h:2279 [inline]
 ext4_file_mmap_prepare+0x286/0x460 fs/ext4/file.c:901
 vfs_mmap_prepare include/linux/fs.h:2071 [inline]
 call_mmap_prepare mm/vma.c:2799 [inline]
 __mmap_region mm/vma.c:2888 [inline]
 mmap_region+0xebb/0x25c0 mm/vma.c:2989
 do_mmap+0xe0e/0x1310 mm/mmap.c:573
 vm_mmap_pgoff+0x275/0x4e0 mm/util.c:581
 ksys_mmap_pgoff+0x4a6/0x720 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: 0033:0x7f0d4193f2c2
RSP: 002b:00007ffe1a581ef8 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000001b31464000 RCX: 00007f0d4193f2c2
RDX: 0000000000000003 RSI: 00000000003c0000 RDI: 0000001b31464000
RBP: 0000000000100001 R08: 0000000000000004 R09: 0000000000040000
R10: 0000000000100001 R11: 0000000000000206 R12: 00000000000001ef
R13: 00000000000927c0 R14: 000000000004ec65 R15: 00007ffe1a5821d0
 </TASK>

Showing all locks held in the system:
locks held by pr/ttyS0/36: 3, last CPU#1:
 #0: ffffffff8f299858 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:314 [inline]
 #0: ffffffff8f299858 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:493 [inline]
 #0: ffffffff8f299858 (console_srcu){....}-{0:0}, at: console_srcu_read_lock+0x30/0x60 kernel/printk/printk.c:291
 #1: ffffffff9b0c97b8 (&port_lock_key){+.+.}-{3:3}, at: nbcon_emit_one kernel/printk/nbcon.c:1137 [inline]
 #1: ffffffff9b0c97b8 (&port_lock_key){+.+.}-{3:3}, at: nbcon_kthread_func+0x6ac/0x8d0 kernel/printk/nbcon.c:1271
 #2: ffffffff8f3bfdc0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #2: ffffffff8f3bfdc0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #2: ffffffff8f3bfdc0 (rcu_read_lock){....}-{1:3}, at: __rt_spin_lock kernel/locking/spinlock_rt.c:50 [inline]
 #2: ffffffff8f3bfdc0 (rcu_read_lock){....}-{1:3}, at: rt_spin_lock+0x1e2/0x400 kernel/locking/spinlock_rt.c:57
locks held by khungtaskd/37: 1, last CPU#0:
 #0: ffffffff8f3bfdc0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffffffff8f3bfdc0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8f3bfdc0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6871
locks held by kworker/u8:11/1448: 6, on CPU#1:
 #0: ffff88801f6fd938 ((wq_completion)writeback){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffff88801f6fd938 ((wq_completion)writeback){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffff88801f6fd938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
 #0: ffff88801f6fd938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
 #1: ffffc90006a2fc40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #1: ffffc90006a2fc40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #1: ffffc90006a2fc40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
 #1: ffffc90006a2fc40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
 #2: ffff888037d440e0 (&type->s_umount_key#33){++++}-{4:4}, at: super_trylock_shared+0x23/0xf0 fs/super.c:670
 #3: ffff888037c78d98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1f1/0x4e0 fs/ext4/inode.c:3031
 #4: ffff888036f6abb0 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
 #5: ffff888040e1f358 (&ei->i_data_sem#2){++++}-{4:4}, at: ext4_map_blocks+0x77d/0x12c0 fs/ext4/inode.c:822
locks held by kworker/u8:17/1461: 6, last CPU#1:
 #0: ffff88813fe2c138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffff88813fe2c138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffff88813fe2c138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
 #0: ffff88813fe2c138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
 #1: ffffc90006adfc40 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #1: ffffc90006adfc40 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #1: ffffc90006adfc40 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
 #1: ffffc90006adfc40 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
 #2: ffff888026fd8310 (&devlink->lock_key#3){+.+.}-{4:4}, at: nsim_dev_trap_report_work+0x57/0xca0 drivers/net/netdevsim/dev.c:834
 #3: ffff888061f7e120 (&nsim_trap_data->trap_lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:45 [inline]
 #3: ffff888061f7e120 (&nsim_trap_data->trap_lock){+.+.}-{3:3}, at: nsim_dev_trap_report drivers/net/netdevsim/dev.c:787 [inline]
 #3: ffff888061f7e120 (&nsim_trap_data->trap_lock){+.+.}-{3:3}, at: nsim_dev_trap_report_work+0x1e0/0xca0 drivers/net/netdevsim/dev.c:847
 #4: ffffffff8f3bfdc0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #4: ffffffff8f3bfdc0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #4: ffffffff8f3bfdc0 (rcu_read_lock){....}-{1:3}, at: __rt_spin_lock kernel/locking/spinlock_rt.c:50 [inline]
 #4: ffffffff8f3bfdc0 (rcu_read_lock){....}-{1:3}, at: rt_spin_lock+0x1e2/0x400 kernel/locking/spinlock_rt.c:57
 #5: ffffffff8f3bfdc0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #5: ffffffff8f3bfdc0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #5: ffffffff8f3bfdc0 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
 #5: ffffffff8f3bfdc0 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0x8f/0x2550 arch/x86/kernel/unwind_orc.c:495
locks held by syz-executor/5570: 3, on CPU#0:
 #0: ffff88803ce60bc8 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:310
 #1: ffff888037d44688 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
 #1: ffff888037d44688 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1fe/0x12c0 fs/ext4/inode.c:6898
 #2: ffff888036f6abb0 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
locks held by getty/11092: 2, on CPU#0:
 #0: ffff888029b840a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000450b2e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x460/0x1360 drivers/tty/n_tty.c:2211
locks held by syz.3.2331/11514: 2, last CPU#0:
 #0: ffff88804220fa58 (&ima_iint_mutex_key[depth]#2){+.+.}-{4:4}, at: process_measurement+0x7e0/0x1c20 security/integrity/ima/ima_main.c:319
 #1: ffffffff8f5884f0 (kclist_lock){++++}-{0:0}, at: raw_spin_rq_lock_nested+0x2d/0x160 kernel/sched/core.c:677
locks held by syz.0.2344/11545: 3, on CPU#0:
 #0: ffff88805dc9f088 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:310
 #1: ffff888037d44688 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
 #1: ffff888037d44688 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1fe/0x12c0 fs/ext4/inode.c:6898
 #2: ffff888036f6abb0 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
locks held by syz.4.2345/11549: 3, on CPU#1:
 #0: ffff888034f5c6c8 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:310
 #1: ffff888037d44688 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
 #1: ffff888037d44688 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1fe/0x12c0 fs/ext4/inode.c:6898
 #2: ffff888036f6abb0 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
locks held by syz.5.2348/11554: 3, on CPU#0:
 #0: ffff888045c44588 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:310
 #1: ffff888037d44688 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
 #1: ffff888037d44688 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1fe/0x12c0 fs/ext4/inode.c:6898
 #2: ffff888036f6abb0 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
locks held by syz.1.2350/11560: 3, on CPU#0:
 #0: ffff8880410c83b8 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:562 [inline]
 #0: ffff8880410c83b8 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1e0/0x4e0 mm/util.c:579
 #1: ffff888037d44510 (sb_writers#4){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2279 [inline]
 #1: ffff888037d44510 (sb_writers#4){.+.+}-{0:0}, at: ext4_file_mmap_prepare+0x286/0x460 fs/ext4/file.c:901
 #2: ffff888036f6abb0 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444

=============================================

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Tainted: G             L       syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
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:353 [inline]
 watchdog+0xfd2/0x1030 kernel/hung_task.c:561
 kthread+0x38b/0x470 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 36 Comm: pr/ttyS0 Tainted: G             L       syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:io_serial_in+0x77/0xc0 drivers/tty/serial/8250/8250_port.c:409
Code: e8 7e e2 60 fc 44 89 f9 d3 e3 49 83 ee 80 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 bf c1 cd fc 41 03 1e 89 da ec <0f> b6 c0 5b 41 5c 41 5e 41 5f e9 1a c8 fb 05 cc 44 89 f9 80 e1 07
RSP: 0018:ffffc90000ad78b8 EFLAGS: 00000202
RAX: 1ffffffff3619200 RBX: 00000000000003fd RCX: 0000000000000000
RDX: 00000000000003fd RSI: 0000000000000000 RDI: 0000000000000000
RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffffff8565c500 R12: dffffc0000000000
R13: 0000000000000000 R14: ffffffff9b0c97e0 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881248a5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005608d9ef3168 CR3: 000000000f1b0000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 serial_in drivers/tty/serial/8250/8250.h:128 [inline]
 serial_lsr_in drivers/tty/serial/8250/8250.h:150 [inline]
 wait_for_lsr+0x190/0x300 drivers/tty/serial/8250/8250_port.c:2013
 serial8250_fifo_wait_for_lsr_thre drivers/tty/serial/8250/8250_port.c:3270 [inline]
 __serial8250_console_fifo_write+0x34f/0x3f0 drivers/tty/serial/8250/8250_port.c:3372
 serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3378 [inline]
 __serial8250_console_write drivers/tty/serial/8250/8250_port.c:3432 [inline]
 serial8250_console_write+0xaa2/0x1220 drivers/tty/serial/8250/8250_port.c:3496
 nbcon_emit_next_record+0xef5/0x1a90 kernel/printk/nbcon.c:-1
 nbcon_emit_one kernel/printk/nbcon.c:1157 [inline]
 nbcon_kthread_func+0x6d9/0x8d0 kernel/printk/nbcon.c:1271
 kthread+0x38b/0x470 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>