INFO: task jbd2/sda1-8:4942 blocked in I/O wait for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kerne
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:jbd2/sda1-8     state:D stack:24128 pid:4942  tgid:4942  ppid:2      task_flags:0x240040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x1b2a/0x59a0 kernel/sched/core.c:7232
 __schedule_loop kernel/sched/core.c:7309 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7324
 io_schedule+0x7f/0xd0 kernel/sched/core.c:8152
 bit_wait_io+0x11/0xd0 kernel/sched/wait_bit.c:250
 __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:418 [inline]
 jbd2_journal_commit_transaction+0x2f1d/0x5b70 fs/jbd2/commit.c:834
 kjournald2+0x3bc/0x750 fs/jbd2/journal.c:200
 kthread+0x388/0x470 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:5597 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:22224 pid:5597  tgid:5597  ppid:5596   task_flags:0x440100 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x1b2a/0x59a0 kernel/sched/core.c:7232
 __schedule_loop kernel/sched/core.c:7309 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7324
 io_schedule+0x7f/0xd0 kernel/sched/core.c:8152
 bit_wait_io+0x11/0xd0 kernel/sched/wait_bit.c:250
 __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:105 [inline]
 do_get_write_access+0x662/0x1070 fs/jbd2/transaction.c:1113
 jbd2_journal_get_write_access+0x1d7/0x230 fs/jbd2/transaction.c:1263
 __ext4_journal_get_write_access+0xf1/0x620 fs/ext4/ext4_jbd2.c:249
 ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:6509
 __ext4_mark_inode_dirty+0x146/0x7b0 fs/ext4/inode.c:6694
 ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:6731
 __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+0x224/0x1140 fs/ext4/inode.c:6897
 do_page_mkwrite+0x147/0x310 mm/memory.c:3816
 wp_page_shared mm/memory.c:4217 [inline]
 do_wp_page+0x1a9c/0x4b80 mm/memory.c:4440
 handle_pte_fault mm/memory.c:6583 [inline]
 __handle_mm_fault mm/memory.c:6708 [inline]
 handle_mm_fault+0x15d7/0x3750 mm/memory.c:6877
 do_user_addr_fault+0xa4d/0x1340 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: 0033:0x7f988587c662
RSP: 002b:00007fffa974e1c0 EFLAGS: 00010246
RAX: 00007f98838d8000 RBX: 0000555584345ec0 RCX: 0000000000000000
RDX: 0000000000002c1d RSI: 00005555842c5878 RDI: 0000000000000001
RBP: 00007fffa974e6c0 R08: 00005555842c5880 R09: 00000000000000a3
R10: 0000000000000000 R11: 0000000000000202 R12: 00007fffa974e500
R13: 00007fffa974e2f0 R14: 585858582e7a7973 R15: 00007fffa974e240
 </TASK>
INFO: task syz.8.4079:26133 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.8.4079      state:D stack:24912 pid:26133 tgid:26133 ppid:24234  task_flags:0x440040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x1b2a/0x59a0 kernel/sched/core.c:7232
 __schedule_loop kernel/sched/core.c:7309 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7324
 io_schedule+0x7f/0xd0 kernel/sched/core.c:8152
 bit_wait_io+0x11/0xd0 kernel/sched/wait_bit.c:250
 __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:105 [inline]
 do_get_write_access+0x662/0x1070 fs/jbd2/transaction.c:1113
 jbd2_journal_get_write_access+0x1d7/0x230 fs/jbd2/transaction.c:1263
 __ext4_journal_get_write_access+0xf1/0x620 fs/ext4/ext4_jbd2.c:249
 ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:6509
 __ext4_mark_inode_dirty+0x146/0x7b0 fs/ext4/inode.c:6694
 ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:6731
 __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+0x224/0x1140 fs/ext4/inode.c:6897
 do_page_mkwrite+0x147/0x310 mm/memory.c:3816
 do_shared_fault mm/memory.c:6077 [inline]
 do_fault mm/memory.c:6139 [inline]
 do_pte_missing+0x757/0x34b0 mm/memory.c:4700
 handle_pte_fault mm/memory.c:6559 [inline]
 __handle_mm_fault mm/memory.c:6708 [inline]
 handle_mm_fault+0x1a53/0x3750 mm/memory.c:6877
 do_user_addr_fault+0xa4d/0x1340 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: 0033:0x7fb7a8e72789
RSP: 002b:00007ffc3a59f670 EFLAGS: 00010202
RAX: 0000001b2f924000 RBX: 0000000000000000 RCX: 00000000003ffde8
RDX: 0000001b2f923ffc RSI: 00000000003ffde8 RDI: 00007fb7a9d55700
RBP: 0000000000000000 R08: 0000000000000000 R09: 00007fb7a9212000
R10: 00007fb7a9d55700 R11: 0000000000000000 R12: 0000000000000000
R13: 000000000004116d R14: ffffffff816d4aae R15: 00007fb7a9d55720
 </TASK>
INFO: task syz.7.4085:26153 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.7.4085      state:D stack:25576 pid:26153 tgid:26153 ppid:21365  task_flags:0x440040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x1b2a/0x59a0 kernel/sched/core.c:7232
 __schedule_loop kernel/sched/core.c:7309 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7324
 io_schedule+0x7f/0xd0 kernel/sched/core.c:8152
 bit_wait_io+0x11/0xd0 kernel/sched/wait_bit.c:250
 __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:105 [inline]
 do_get_write_access+0x662/0x1070 fs/jbd2/transaction.c:1113
 jbd2_journal_get_write_access+0x1d7/0x230 fs/jbd2/transaction.c:1263
 __ext4_journal_get_write_access+0xf1/0x620 fs/ext4/ext4_jbd2.c:249
 ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:6509
 __ext4_mark_inode_dirty+0x146/0x7b0 fs/ext4/inode.c:6694
 ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:6731
 __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+0x224/0x1140 fs/ext4/inode.c:6897
 do_page_mkwrite+0x147/0x310 mm/memory.c:3816
 do_shared_fault mm/memory.c:6077 [inline]
 do_fault mm/memory.c:6139 [inline]
 do_pte_missing+0x757/0x34b0 mm/memory.c:4700
 handle_pte_fault mm/memory.c:6559 [inline]
 __handle_mm_fault mm/memory.c:6708 [inline]
 handle_mm_fault+0x1a53/0x3750 mm/memory.c:6877
 do_user_addr_fault+0xa4d/0x1340 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: 0033:0x7fd32b472eb2
RSP: 002b:00007ffd2fadc180 EFLAGS: 00010202
RAX: 0000000000011008 RBX: 00007fd32c355720 RCX: 0000000000000000
RDX: 0000001b34513000 RSI: 0000000000000008 RDI: 00007fd32c355720
RBP: 00000000000006e2 R08: 00007fd32b810000 R09: 00007fd32b826128
R10: 0000000000000003 R11: 000000000000000c R12: ffffffff82603551
R13: 00007fd32b826128 R14: 0000000000000369 R15: fffffffffffef000
 </TASK>
INFO: task syz.0.4090:26167 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.0.4090      state:D stack:26824 pid:26167 tgid:26167 ppid:18993  task_flags:0x440040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x1b2a/0x59a0 kernel/sched/core.c:7232
 __schedule_loop kernel/sched/core.c:7309 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7324
 io_schedule+0x7f/0xd0 kernel/sched/core.c:8152
 bit_wait_io+0x11/0xd0 kernel/sched/wait_bit.c:250
 __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:105 [inline]
 do_get_write_access+0x662/0x1070 fs/jbd2/transaction.c:1113
 jbd2_journal_get_write_access+0x1d7/0x230 fs/jbd2/transaction.c:1263
 __ext4_journal_get_write_access+0xf1/0x620 fs/ext4/ext4_jbd2.c:249
 ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:6509
 __ext4_mark_inode_dirty+0x146/0x7b0 fs/ext4/inode.c:6694
 ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:6731
 __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+0x224/0x1140 fs/ext4/inode.c:6897
 do_page_mkwrite+0x147/0x310 mm/memory.c:3816
 do_shared_fault mm/memory.c:6077 [inline]
 do_fault mm/memory.c:6139 [inline]
 do_pte_missing+0x757/0x34b0 mm/memory.c:4700
 handle_pte_fault mm/memory.c:6559 [inline]
 __handle_mm_fault mm/memory.c:6708 [inline]
 handle_mm_fault+0x1a53/0x3750 mm/memory.c:6877
 do_user_addr_fault+0xa4d/0x1340 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: 0033:0x7f757326ba23
RSP: 002b:00007ffca02aa710 EFLAGS: 00010246
RAX: 000000000003fde8 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000001b2f224000 RSI: 0000000000040000 RDI: 00007f75735e0708
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffca02aa9a0
 </TASK>
INFO: task syz.6.4087:26169 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.6.4087      state:D stack:27256 pid:26169 tgid:26169 ppid:19925  task_flags:0x440040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x1b2a/0x59a0 kernel/sched/core.c:7232
 __schedule_loop kernel/sched/core.c:7309 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7324
 io_schedule+0x7f/0xd0 kernel/sched/core.c:8152
 bit_wait_io+0x11/0xd0 kernel/sched/wait_bit.c:250
 __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:105 [inline]
 do_get_write_access+0x662/0x1070 fs/jbd2/transaction.c:1113
 jbd2_journal_get_write_access+0x1d7/0x230 fs/jbd2/transaction.c:1263
 __ext4_journal_get_write_access+0xf1/0x620 fs/ext4/ext4_jbd2.c:249
 ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:6509
 __ext4_mark_inode_dirty+0x146/0x7b0 fs/ext4/inode.c:6694
 ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:6731
 __mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2729
 generic_update_time fs/inode.c:2254 [inline]
 touch_atime+0x565/0x670 fs/inode.c:2329
 file_accessed include/linux/fs.h:2278 [inline]
 ext4_file_mmap_prepare+0x277/0x450 fs/ext4/file.c:901
 vfs_mmap_prepare include/linux/fs.h:2070 [inline]
 call_mmap_prepare mm/vma.c:2805 [inline]
 __mmap_region mm/vma.c:2901 [inline]
 mmap_region+0xe8b/0x2460 mm/vma.c:3002
 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+0x166/0x510 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ffb5a39de42
RSP: 002b:00007ffd70a1f058 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000001b31564000 RCX: 00007ffb5a39de42
RDX: 0000000000000003 RSI: 00000000003c0000 RDI: 0000001b31564000
RBP: 0000000000100001 R08: 0000000000000004 R09: 0000000000040000
R10: 0000000000100001 R11: 0000000000000206 R12: 0000000000000162
R13: 00000000000927c0 R14: 000000000012bb39 R15: 00007ffd70a1f330
 </TASK>
INFO: task syz.5.4091:26170 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.5.4091      state:D stack:27256 pid:26170 tgid:26170 ppid:22536  task_flags:0x440040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x1b2a/0x59a0 kernel/sched/core.c:7232
 __schedule_loop kernel/sched/core.c:7309 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7324
 io_schedule+0x7f/0xd0 kernel/sched/core.c:8152
 bit_wait_io+0x11/0xd0 kernel/sched/wait_bit.c:250
 __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:105 [inline]
 do_get_write_access+0x662/0x1070 fs/jbd2/transaction.c:1113
 jbd2_journal_get_write_access+0x1d7/0x230 fs/jbd2/transaction.c:1263
 __ext4_journal_get_write_access+0xf1/0x620 fs/ext4/ext4_jbd2.c:249
 ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:6509
 __ext4_mark_inode_dirty+0x146/0x7b0 fs/ext4/inode.c:6694
 ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:6731
 __mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2729
 generic_update_time fs/inode.c:2254 [inline]
 touch_atime+0x565/0x670 fs/inode.c:2329
 file_accessed include/linux/fs.h:2278 [inline]
 ext4_file_mmap_prepare+0x277/0x450 fs/ext4/file.c:901
 vfs_mmap_prepare include/linux/fs.h:2070 [inline]
 call_mmap_prepare mm/vma.c:2805 [inline]
 __mmap_region mm/vma.c:2901 [inline]
 mmap_region+0xe8b/0x2460 mm/vma.c:3002
 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+0x166/0x510 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ffa7699de42
RSP: 002b:00007ffc66b26e88 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000001b2cd64000 RCX: 00007ffa7699de42
RDX: 0000000000000003 RSI: 00000000003c0000 RDI: 0000001b2cd64000
RBP: 0000000000100001 R08: 0000000000000004 R09: 0000000000040000
R10: 0000000000100001 R11: 0000000000000206 R12: 000000000000009f
R13: 00000000000927c0 R14: 000000000012be50 R15: 00007ffc66b27160
 </TASK>

Showing all locks held in the system:
locks held by pr/ttyS0/16: 2, last CPU#0:
 #0: ffffffff8ea36278 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:314 [inline]
 #0: ffffffff8ea36278 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:439 [inline]
 #0: ffffffff8ea36278 (console_srcu){....}-{0:0}, at: console_srcu_read_lock+0x30/0x60 kernel/printk/printk.c:291
 #1: ffffffff9aafec18 (&port_lock_key){-.-.}-{3:3}, at: __uart_port_lock_irqsave include/linux/serial_core.h:613 [inline]
 #1: ffffffff9aafec18 (&port_lock_key){-.-.}-{3:3}, at: univ8250_console_device_lock+0x67/0xc0 drivers/tty/serial/8250/8250_core.c:413
locks held by khungtaskd/31: 1, last CPU#1:
 #0: ffffffff8eb5c6a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffffffff8eb5c6a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8eb5c6a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6837
locks held by kworker/u8:8/1448: 2, last CPU#0:
 #0: ffff888031dc9940 ((wq_completion)bat_events){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffff888031dc9940 ((wq_completion)bat_events){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffff888031dc9940 ((wq_completion)bat_events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3340 [inline]
 #0: ffff888031dc9940 ((wq_completion)bat_events){+.+.}-{0:0}, at: process_scheduled_works+0x97e/0x1630 kernel/workqueue.c:3458
 #1: ffffc90005a47c40 ((work_completion)(&(&bat_priv->dat.work)->work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #1: ffffc90005a47c40 ((work_completion)(&(&bat_priv->dat.work)->work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #1: ffffc90005a47c40 ((work_completion)(&(&bat_priv->dat.work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3340 [inline]
 #1: ffffc90005a47c40 ((work_completion)(&(&bat_priv->dat.work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97e/0x1630 kernel/workqueue.c:3458
locks held by klogd/4969: 1, last CPU#1:
 #0: ffffffff8eca4af0 (remove_cache_srcu){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:198 [inline]
 #0: ffffffff8eca4af0 (remove_cache_srcu){.+.+}-{0:0}, at: srcu_read_lock+0x27/0x60 include/linux/srcu.h:305
locks held by getty/5364: 2, on CPU#0:
 #0: ffff8880354d90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc900032262e8 (&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#0:
 #0: ffff888074548448 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:310
 #1: ffff888030bc4558 (sb_pagefaults){.+.+}-{0:0}, at: percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline]
 #1: ffff888030bc4558 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs/super.h:19 [inline]
 #1: ffff888030bc4558 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
 #1: ffff888030bc4558 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x202/0x1140 fs/ext4/inode.c:6896
 #2: ffff888034f5e938 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fbf/0x2200 fs/jbd2/transaction.c:444
locks held by syz.8.4079/26133: 3, on CPU#0:
 #0: ffff8880334f1308 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:310
 #1: ffff888030bc4558 (sb_pagefaults){.+.+}-{0:0}, at: percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline]
 #1: ffff888030bc4558 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs/super.h:19 [inline]
 #1: ffff888030bc4558 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
 #1: ffff888030bc4558 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x202/0x1140 fs/ext4/inode.c:6896
 #2: ffff888034f5e938 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fbf/0x2200 fs/jbd2/transaction.c:444
locks held by syz.7.4085/26153: 3, on CPU#1:
 #0: ffff8880328b3088 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:310
 #1: ffff888030bc4558 (sb_pagefaults){.+.+}-{0:0}, at: percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline]
 #1: ffff888030bc4558 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs/super.h:19 [inline]
 #1: ffff888030bc4558 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
 #1: ffff888030bc4558 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x202/0x1140 fs/ext4/inode.c:6896
 #2: ffff888034f5e938 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fbf/0x2200 fs/jbd2/transaction.c:444
locks held by syz.0.4090/26167: 3, on CPU#1:
 #0: ffff8880774bee48 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:310
 #1: ffff888030bc4558 (sb_pagefaults){.+.+}-{0:0}, at: percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline]
 #1: ffff888030bc4558 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs/super.h:19 [inline]
 #1: ffff888030bc4558 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
 #1: ffff888030bc4558 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x202/0x1140 fs/ext4/inode.c:6896
 #2: ffff888034f5e938 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fbf/0x2200 fs/jbd2/transaction.c:444
locks held by syz.6.4087/26169: 3, on CPU#0:
 #0: ffff888028de5038 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:562 [inline]
 #0: ffff888028de5038 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1dd/0x4e0 mm/util.c:579
 #1: ffff888030bc4460 (sb_writers#4){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2278 [inline]
 #1: ffff888030bc4460 (sb_writers#4){.+.+}-{0:0}, at: ext4_file_mmap_prepare+0x277/0x450 fs/ext4/file.c:901
 #2: ffff888034f5e938 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fbf/0x2200 fs/jbd2/transaction.c:444
locks held by syz.5.4091/26170: 3, on CPU#0:
 #0: ffff888028de5cf8 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:562 [inline]
 #0: ffff888028de5cf8 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1dd/0x4e0 mm/util.c:579
 #1: ffff888030bc4460 (sb_writers#4){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2278 [inline]
 #1: ffff888030bc4460 (sb_writers#4){.+.+}-{0:0}, at: ext4_file_mmap_prepare+0x277/0x450 fs/ext4/file.c:901
 #2: ffff888034f5e938 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fbf/0x2200 fs/jbd2/transaction.c:444

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 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+0x17a/0x380 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+0xfd7/0x1030 kernel/hung_task.c:561
 kthread+0x388/0x470 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 1448 Comm: kworker/u8:8 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: bat_events batadv_dat_purge
RIP: 0010:mark_lock+0xa5/0x190 kernel/locking/lockdep.c:4790
Code: b8 0e 48 c7 c6 76 bb 37 8e 67 48 0f b9 3a 90 31 c9 4c 89 fe 4c 89 f7 b8 01 00 00 00 85 69 60 74 10 5b 41 5c 41 5d 41 5e 41 5f <5d> e9 85 f8 3a 0a cc 49 89 fe 49 89 f7 e8 c9 90 ff ff 89 c1 31 c0
RSP: 0018:ffffc90005a47a20 EFLAGS: 00000002
RAX: 0000000000000001 RBX: ffff888029223e80 RCX: ffffffff941dcc60
RDX: 0000000000000006 RSI: ffff888029224a30 RDI: ffff888029223e80
RBP: 0000000000000040 R08: ffffffff9058fb7f R09: 1ffffffff20b1f6f
R10: dffffc0000000000 R11: fffffbfff20b1f70 R12: ffff888029224a80
R13: ffff88802a4f9e40 R14: ffff888029224a30 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888124f0c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000562a39b5f168 CR3: 000000000e948000 CR4: 00000000003526f0
DR0: ffffffffffffffff DR1: 0000000000000005 DR2: 0000000000000083
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 mark_held_locks kernel/locking/lockdep.c:4341 [inline]
 __trace_hardirqs_on_caller kernel/locking/lockdep.c:4367 [inline]
 lockdep_hardirqs_on_prepare+0x17b/0x270 kernel/locking/lockdep.c:4426
 trace_hardirqs_on+0x28/0x40 kernel/trace/trace_preemptirq.c:78
 __local_bh_enable_ip+0xd0/0x130 kernel/softirq.c:455
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 __batadv_dat_purge net/batman-adv/distributed-arp-table.c:186 [inline]
 batadv_dat_purge+0x2d7/0x3c0 net/batman-adv/distributed-arp-table.c:205
 process_one_work kernel/workqueue.c:3375 [inline]
 process_scheduled_works+0xc4e/0x1630 kernel/workqueue.c:3458
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3539
 kthread+0x388/0x470 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>