INFO: task kworker/u8:6:154 blocked in I/O wait for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:6    state:D stack:22880 pid:154   tgid:154   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+0x17dd/0x5820 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7474
 io_schedule+0x7f/0xd0 kernel/sched/core.c:8146
 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:253
 ext4_mb_mark_context+0x171/0xec0 fs/ext4/mballoc.c:4110
 ext4_mb_mark_diskspace_used+0x338/0x760 fs/ext4/mballoc.c:4239
 ext4_mb_new_blocks+0x1062/0x4520 fs/ext4/mballoc.c:6327
 ext4_ext_map_blocks+0x1427/0x5480 fs/ext4/extents.c:4469
 ext4_map_create_blocks+0x116/0x530 fs/ext4/inode.c:697
 ext4_map_blocks+0xe8e/0x1c60 fs/ext4/inode.c:942
 mpage_map_one_extent fs/ext4/inode.c:2505 [inline]
 mpage_map_and_submit_extent fs/ext4/inode.c:2601 [inline]
 ext4_do_writepages+0x1978/0x44a0 fs/ext4/inode.c:3077
 ext4_writepages+0x1fe/0x4e0 fs/ext4/inode.c:3171
 do_writepages+0x338/0x560 mm/page-writeback.c:2560
 __writeback_single_inode+0x136/0x1220 fs/fs-writeback.c:1800
 writeback_sb_inodes+0x9de/0x1af0 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+0xc92/0x10f0 fs/fs-writeback.c:2509
 process_one_work kernel/workqueue.c:3495 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3578
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3659
 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>
INFO: task jbd2/sda1-8:4939 blocked in I/O wait for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:jbd2/sda1-8     state:D stack:26280 pid:4939  tgid:4939  ppid:2      task_flags:0x240040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x17dd/0x5820 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7474
 io_schedule+0x7f/0xd0 kernel/sched/core.c:8146
 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_buffer include/linux/buffer_head.h:476 [inline]
 jbd2_journal_commit_transaction+0x2f6e/0x5c80 fs/jbd2/commit.c:834
 kjournald2+0x3bc/0x740 fs/jbd2/journal.c:200
 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>
INFO: task syz-executor:5597 blocked in I/O wait for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:22664 pid:5597  tgid:5597  ppid:5596   task_flags:0x440100 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x17dd/0x5820 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7474
 io_schedule+0x7f/0xd0 kernel/sched/core.c:8146
 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:253
 ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:7445
 __ext4_mark_inode_dirty+0x141/0x7e0 fs/ext4/inode.c:7636
 ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:7673
 __mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2741
 generic_update_time fs/inode.c:2253 [inline]
 file_update_time_flags+0x399/0x440 fs/inode.c:2483
 ext4_page_mkwrite+0x21f/0x1470 fs/ext4/inode.c:7858
 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:6672 [inline]
 __handle_mm_fault mm/memory.c:6797 [inline]
 handle_mm_fault+0x15c1/0x3540 mm/memory.c:6964
 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: 0033:0x7f734d47cae2
RSP: 002b:00007ffd0093d9a0 EFLAGS: 00010202
RAX: 00007f734b57c000 RBX: 000055557c5fd810 RCX: 0000000000000003
RDX: 0000000000001de1 RSI: 000055557c5feca8 RDI: 0000000000000008
RBP: 00007ffd0093dea0 R08: 000055557c5feca8 R09: 00000000000000a6
R10: 0000000000008000 R11: 0000000000000001 R12: 00007ffd0093dce0
R13: 00007ffd0093dad0 R14: 585858582e7a7973 R15: 00007ffd0093da20
 </TASK>
INFO: task syz.1.44:6058 blocked in I/O wait for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.44        state:D stack:26024 pid:6058  tgid:6058  ppid:5607   task_flags:0x440040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x17dd/0x5820 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7474
 io_schedule+0x7f/0xd0 kernel/sched/core.c:8146
 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:253
 ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:7445
 __ext4_mark_inode_dirty+0x141/0x7e0 fs/ext4/inode.c:7636
 ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:7673
 __mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2741
 generic_update_time fs/inode.c:2253 [inline]
 file_update_time_flags+0x399/0x440 fs/inode.c:2483
 ext4_page_mkwrite+0x21f/0x1470 fs/ext4/inode.c:7858
 do_page_mkwrite+0x147/0x310 mm/memory.c:3878
 do_shared_fault mm/memory.c:6171 [inline]
 do_fault mm/memory.c:6233 [inline]
 do_pte_missing+0x70f/0x3570 mm/memory.c:4762
 handle_pte_fault mm/memory.c:6648 [inline]
 __handle_mm_fault mm/memory.c:6797 [inline]
 handle_mm_fault+0x1a2a/0x3540 mm/memory.c:6964
 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: 0033:0x7f7b47e6bea3
RSP: 002b:00007ffc3aec3820 EFLAGS: 00010246
RAX: 00000000005ffde8 RBX: 0000000000000000 RCX: 0000001b32f64000
RDX: 0000001b32f24000 RSI: 0000000000600000 RDI: 00007f7b481e4708
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffc3aec3ab0
 </TASK>
INFO: task syz.0.52:6067 blocked in I/O wait for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.52        state:D stack:26936 pid:6067  tgid:6067  ppid:5609   task_flags:0x440040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x17dd/0x5820 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7474
 io_schedule+0x7f/0xd0 kernel/sched/core.c:8146
 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:253
 ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:7445
 __ext4_mark_inode_dirty+0x141/0x7e0 fs/ext4/inode.c:7636
 ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:7673
 __mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2741
 generic_update_time fs/inode.c:2253 [inline]
 touch_atime+0x568/0x670 fs/inode.c:2328
 file_accessed include/linux/fs.h:2281 [inline]
 ext4_file_mmap_prepare+0x277/0x450 fs/ext4/file.c:919
 vfs_mmap_prepare include/linux/fs.h:2073 [inline]
 call_mmap_prepare mm/vma.c:2916 [inline]
 __mmap_region mm/vma.c:3033 [inline]
 mmap_region+0xef9/0x2840 mm/vma.c:3131
 do_mmap+0xe0a/0x1300 mm/mmap.c:573
 vm_mmap_pgoff+0x27a/0x520 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: 0033:0x7f7fbe59e2c2
RSP: 002b:00007ffe21dbf178 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000001b32e64000 RCX: 00007f7fbe59e2c2
RDX: 0000000000000003 RSI: 00000000003c0000 RDI: 0000001b32e64000
RBP: 0000000000100001 R08: 0000000000000004 R09: 0000000000040000
R10: 0000000000100001 R11: 0000000000000206 R12: 0000000000000008
R13: 00000000000927c0 R14: 00000000000184bf R15: 00007ffe21dbf450
 </TASK>
INFO: task syz.4.53:6068 blocked in I/O wait for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.53        state:D stack:26936 pid:6068  tgid:6068  ppid:5608   task_flags:0x440040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x17dd/0x5820 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7474
 io_schedule+0x7f/0xd0 kernel/sched/core.c:8146
 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:253
 ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:7445
 __ext4_mark_inode_dirty+0x141/0x7e0 fs/ext4/inode.c:7636
 ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:7673
 __mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2741
 generic_update_time fs/inode.c:2253 [inline]
 touch_atime+0x568/0x670 fs/inode.c:2328
 file_accessed include/linux/fs.h:2281 [inline]
 ext4_file_mmap_prepare+0x277/0x450 fs/ext4/file.c:919
 vfs_mmap_prepare include/linux/fs.h:2073 [inline]
 call_mmap_prepare mm/vma.c:2916 [inline]
 __mmap_region mm/vma.c:3033 [inline]
 mmap_region+0xef9/0x2840 mm/vma.c:3131
 do_mmap+0xe0a/0x1300 mm/mmap.c:573
 vm_mmap_pgoff+0x27a/0x520 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: 0033:0x7f059599e2c2
RSP: 002b:00007ffc937cc198 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000001b33264000 RCX: 00007f059599e2c2
RDX: 0000000000000003 RSI: 00000000003c0000 RDI: 0000001b33264000
RBP: 0000000000100001 R08: 0000000000000004 R09: 0000000000040000
R10: 0000000000100001 R11: 0000000000000206 R12: 0000000000000008
R13: 00000000000927c0 R14: 00000000000182f1 R15: 00007ffc937cc470
 </TASK>
INFO: task syz.2.54:6069 blocked in I/O wait for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.54        state:D stack:25208 pid:6069  tgid:6069  ppid:5621   task_flags:0x440040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x17dd/0x5820 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7474
 io_schedule+0x7f/0xd0 kernel/sched/core.c:8146
 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:253
 ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:7445
 __ext4_mark_inode_dirty+0x141/0x7e0 fs/ext4/inode.c:7636
 ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:7673
 __mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2741
 generic_update_time fs/inode.c:2253 [inline]
 touch_atime+0x568/0x670 fs/inode.c:2328
 file_accessed include/linux/fs.h:2281 [inline]
 ext4_file_mmap_prepare+0x277/0x450 fs/ext4/file.c:919
 vfs_mmap_prepare include/linux/fs.h:2073 [inline]
 call_mmap_prepare mm/vma.c:2916 [inline]
 __mmap_region mm/vma.c:3033 [inline]
 mmap_region+0xef9/0x2840 mm/vma.c:3131
 do_mmap+0xe0a/0x1300 mm/mmap.c:573
 vm_mmap_pgoff+0x27a/0x520 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: 0033:0x7f31b259e2c2
RSP: 002b:00007ffd96f8d128 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000001b33064000 RCX: 00007f31b259e2c2
RDX: 0000000000000003 RSI: 00000000003c0000 RDI: 0000001b33064000
RBP: 0000000000100001 R08: 0000000000000004 R09: 0000000000040000
R10: 0000000000100001 R11: 0000000000000206 R12: 0000000000000008
R13: 00000000000927c0 R14: 00000000000184a0 R15: 00007ffd96f8d400
 </TASK>

Showing all locks held in the system:
locks held by khungtaskd/33: 1, last CPU#0:
 #0: ffffffff8fd5a420 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffffffff8fd5a420 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8fd5a420 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6871
locks held by kworker/u8:6/154: 6, on CPU#0:
 #0: ffff888021abb948 ((wq_completion)writeback){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffff888021abb948 ((wq_completion)writeback){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffff888021abb948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3460 [inline]
 #0: ffff888021abb948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3578
 #1: ffffc90002ea7c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #1: ffffc90002ea7c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #1: ffffc90002ea7c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3460 [inline]
 #1: ffffc90002ea7c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3578
 #2: ffff888036ecc0e8 (&type->s_umount_key#35){++++}-{4:4}, at: super_trylock_shared+0x23/0xf0 fs/super.c:670
 #3: ffff888037144cd8 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1f1/0x4e0 fs/ext4/inode.c:3170
 #4: ffff888036eca950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
 #5: ffff88807659dcb8 (&ei->i_data_sem#2){++++}-{4:4}, at: ext4_map_blocks+0xacb/0x1c60 fs/ext4/inode.c:926
locks held by getty/5370: 2, on CPU#1:
 #0: ffff8880377340a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000322e2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360 drivers/tty/n_tty.c:2211
locks held by syz-executor/5597: 3, on CPU#1:
 #0: ffff888024790448 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:333
 #1: ffff888036ecc558 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
 #1: ffff888036ecc558 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1fe/0x1470 fs/ext4/inode.c:7857
 #2: ffff888036eca950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
locks held by syz.1.44/6058: 3, on CPU#0:
 #0: ffff888075b18948 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:333
 #1: ffff888036ecc558 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
 #1: ffff888036ecc558 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1fe/0x1470 fs/ext4/inode.c:7857
 #2: ffff888036eca950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
locks held by syz.0.52/6067: 3, on CPU#0:
 #0: ffff888079b12800 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:550 [inline]
 #0: ffff888079b12800 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1ed/0x520 mm/util.c:579
 #1: ffff888036ecc460 (sb_writers#4){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2281 [inline]
 #1: ffff888036ecc460 (sb_writers#4){.+.+}-{0:0}, at: ext4_file_mmap_prepare+0x277/0x450 fs/ext4/file.c:919
 #2: ffff888036eca950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
locks held by syz.4.53/6068: 3, on CPU#0:
 #0: ffff888036c6c080 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:550 [inline]
 #0: ffff888036c6c080 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1ed/0x520 mm/util.c:579
 #1: ffff888036ecc460 (sb_writers#4){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2281 [inline]
 #1: ffff888036ecc460 (sb_writers#4){.+.+}-{0:0}, at: ext4_file_mmap_prepare+0x277/0x450 fs/ext4/file.c:919
 #2: ffff888036eca950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
locks held by syz.2.54/6069: 3, on CPU#0:
 #0: ffff888036c6b440 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:550 [inline]
 #0: ffff888036c6b440 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1ed/0x520 mm/util.c:579
 #1: ffff888036ecc460 (sb_writers#4){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2281 [inline]
 #1: ffff888036ecc460 (sb_writers#4){.+.+}-{0:0}, at: ext4_file_mmap_prepare+0x277/0x450 fs/ext4/file.c:919
 #2: ffff888036eca950 (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: 33 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
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+0x1073/0x10f0 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT(full) 
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: eb 7e 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 6b 14 00 fb f4 <e9> cc 16 03 00 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffc900001c7e40 EFLAGS: 00000246
RAX: 00000000001b97c9 RBX: ffffffff819c6950 RCX: 8000000000000001
RDX: 0000000000000001 RSI: ffffffff8e471757 RDI: ffffffff8c6e6780
RBP: ffffc900001c7f10 R08: ffff8880b8533d9b R09: 1ffff110170a67b3
R10: dffffc0000000000 R11: ffffed10170a67b4 R12: 0000000000000000
R13: 1ffff11003ed23e8 R14: 1ffff92000038fd0 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888123b8b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000560adcfe3168 CR3: 000000000fb48000 CR4: 00000000003526f0
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
 start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:312
 common_startup_64+0x13e/0x157
 </TASK>