INFO: task jbd2/sda1-8:4930 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:24952
task:jbd2/sda1-8 state:D stack:24952 pid:4930 tgid:4930 ppid:2 task_flags:0x240040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5526 [inline]
__schedule+0x1259/0x6920 kernel/sched/core.c:7276
__schedule_loop kernel/sched/core.c:7353 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7368
io_schedule+0x8a/0xf0 kernel/sched/core.c:8212
bit_wait_io+0xd/0xe0 kernel/sched/wait_bit.c:258
__wait_on_bit+0x65/0x180 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0xdc/0x110 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:106 [inline]
__wait_on_buffer+0x64/0x70 fs/buffer.c:118
wait_on_buffer include/linux/buffer_head.h:418 [inline]
jbd2_journal_commit_transaction+0x37ef/0x6700 fs/jbd2/commit.c:834
kjournald2+0x200/0x760 fs/jbd2/journal.c:200
kthread+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
INFO: task syz-executor:5586 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:22952 pid:5586 tgid:5586 ppid:5585 task_flags:0x440100 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5526 [inline]
__schedule+0x1259/0x6920 kernel/sched/core.c:7276
__schedule_loop kernel/sched/core.c:7353 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7368
io_schedule+0x8a/0xf0 kernel/sched/core.c:8212
bit_wait_io+0xd/0xe0 kernel/sched/wait_bit.c:258
__wait_on_bit+0x65/0x180 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0xdc/0x110 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:106 [inline]
do_get_write_access+0x836/0x11e0 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d6/0x280 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0x277/0x380 fs/ext4/ext4_jbd2.c:249
ext4_reserve_inode_write+0x1b7/0x330 fs/ext4/inode.c:6509
__ext4_mark_inode_dirty+0x18f/0x910 fs/ext4/inode.c:6694
ext4_dirty_inode+0xd9/0x130 fs/ext4/inode.c:6731
__mark_inode_dirty+0x1f3/0x16e0 fs/fs-writeback.c:2729
generic_update_time fs/inode.c:2253 [inline]
file_update_time_flags+0x49c/0x520 fs/inode.c:2483
ext4_page_mkwrite+0x324/0x1860 fs/ext4/inode.c:6897
do_page_mkwrite+0x17a/0x440 mm/memory.c:3816
wp_page_shared mm/memory.c:4217 [inline]
do_wp_page+0x9ed/0x45c0 mm/memory.c:4440
handle_pte_fault mm/memory.c:6582 [inline]
__handle_mm_fault+0x1cd2/0x2f60 mm/memory.c:6707
handle_mm_fault+0x363/0xa20 mm/memory.c:6876
do_user_addr_fault+0x59c/0x12f0 arch/x86/mm/fault.c:1343
handle_page_fault arch/x86/mm/fault.c:1483 [inline]
exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1536
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7f451c07c6e2
RSP: 002b:00007ffd33bb85e0 EFLAGS: 00010202
RAX: 00007f451a094000 RBX: 000055558f2cd2f0 RCX: 0000000000000004
RDX: 0000000000000cdf RSI: 000055558f2d9648 RDI: 0000000000000010
RBP: 00007ffd33bb8ae0 R08: 000055558f2d9648 R09: 00000000000000a0
R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffd33bb8920
R13: 00007ffd33bb8710 R14: 585858582e7a7973 R15: 00007ffd33bb8660
INFO: task syz.5.4464:22029 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.5.4464 state:D stack:26056 pid:22029 tgid:22029 ppid:21678 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5526 [inline]
__schedule+0x1259/0x6920 kernel/sched/core.c:7276
__schedule_loop kernel/sched/core.c:7353 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7368
io_schedule+0x8a/0xf0 kernel/sched/core.c:8212
bit_wait_io+0xd/0xe0 kernel/sched/wait_bit.c:258
__wait_on_bit+0x65/0x180 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0xdc/0x110 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:106 [inline]
do_get_write_access+0x836/0x11e0 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d6/0x280 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0x277/0x380 fs/ext4/ext4_jbd2.c:249
ext4_reserve_inode_write+0x1b7/0x330 fs/ext4/inode.c:6509
__ext4_mark_inode_dirty+0x18f/0x910 fs/ext4/inode.c:6694
ext4_dirty_inode+0xd9/0x130 fs/ext4/inode.c:6731
__mark_inode_dirty+0x1f3/0x16e0 fs/fs-writeback.c:2729
generic_update_time fs/inode.c:2253 [inline]
file_update_time_flags+0x49c/0x520 fs/inode.c:2483
ext4_page_mkwrite+0x324/0x1860 fs/ext4/inode.c:6897
do_page_mkwrite+0x17a/0x440 mm/memory.c:3816
do_shared_fault mm/memory.c:6076 [inline]
do_fault+0x659/0x1830 mm/memory.c:6138
do_pte_missing mm/memory.c:4700 [inline]
handle_pte_fault mm/memory.c:6558 [inline]
__handle_mm_fault+0x150b/0x2f60 mm/memory.c:6707
handle_mm_fault+0x363/0xa20 mm/memory.c:6876
do_user_addr_fault+0x59c/0x12f0 arch/x86/mm/fault.c:1343
handle_page_fault arch/x86/mm/fault.c:1483 [inline]
exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1536
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7fa31d072809
RSP: 002b:00007ffc7d90db10 EFLAGS: 00010202
RAX: 0000001b2f124000 RBX: 0000000000000000 RCX: 00000000003ffde8
RDX: 0000001b2f123ffc RSI: 00000000003ffde8 RDI: 00007fa31df55700
RBP: 0000000000000000 R08: 0000000000000000 R09: 00007fa31d412000
R10: 00007fa31df55700 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000018c9a R14: ffffffff81af6556 R15: 00007fa31df55720
INFO: task syz.0.4468:22046 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.0.4468 state:D stack:27384 pid:22046 tgid:22046 ppid:5597 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5526 [inline]
__schedule+0x1259/0x6920 kernel/sched/core.c:7276
__schedule_loop kernel/sched/core.c:7353 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7368
io_schedule+0x8a/0xf0 kernel/sched/core.c:8212
bit_wait_io+0xd/0xe0 kernel/sched/wait_bit.c:258
__wait_on_bit+0x65/0x180 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0xdc/0x110 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:106 [inline]
do_get_write_access+0x836/0x11e0 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d6/0x280 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0x277/0x380 fs/ext4/ext4_jbd2.c:249
ext4_reserve_inode_write+0x1b7/0x330 fs/ext4/inode.c:6509
__ext4_mark_inode_dirty+0x18f/0x910 fs/ext4/inode.c:6694
ext4_dirty_inode+0xd9/0x130 fs/ext4/inode.c:6731
__mark_inode_dirty+0x1f3/0x16e0 fs/fs-writeback.c:2729
generic_update_time fs/inode.c:2253 [inline]
touch_atime+0x65f/0x770 fs/inode.c:2328
file_accessed include/linux/fs.h:2277 [inline]
ext4_file_mmap_prepare+0x56d/0x670 fs/ext4/file.c:901
vfs_mmap_prepare include/linux/fs.h:2069 [inline]
call_mmap_prepare mm/vma.c:2776 [inline]
__mmap_region+0xeb2/0x32c0 mm/vma.c:2863
mmap_region+0x5a8/0x6d0 mm/vma.c:2964
do_mmap+0x12c7/0x1c30 mm/mmap.c:573
vm_mmap_pgoff+0x28d/0x470 mm/util.c:581
ksys_mmap_pgoff+0x3cb/0x610 mm/mmap.c:619
__do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
__se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
__x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe95559dec2
RSP: 002b:00007ffc1150d158 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000001b32464000 RCX: 00007fe95559dec2
RDX: 0000000000000003 RSI: 00000000003c0000 RDI: 0000001b32464000
RBP: 0000000000100001 R08: 0000000000000004 R09: 0000000000040000
R10: 0000000000100001 R11: 0000000000000206 R12: 00000000000003a9
R13: 00000000000927c0 R14: 0000000000137ac2 R15: 00007ffc1150d430
INFO: task syz.3.4469:22047 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.3.4469 state:D stack:26888 pid:22047 tgid:22047 ppid:5598 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5526 [inline]
__schedule+0x1259/0x6920 kernel/sched/core.c:7276
__schedule_loop kernel/sched/core.c:7353 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7368
io_schedule+0x8a/0xf0 kernel/sched/core.c:8212
bit_wait_io+0xd/0xe0 kernel/sched/wait_bit.c:258
__wait_on_bit+0x65/0x180 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0xdc/0x110 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:106 [inline]
do_get_write_access+0x836/0x11e0 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d6/0x280 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0x277/0x380 fs/ext4/ext4_jbd2.c:249
ext4_reserve_inode_write+0x1b7/0x330 fs/ext4/inode.c:6509
__ext4_mark_inode_dirty+0x18f/0x910 fs/ext4/inode.c:6694
ext4_dirty_inode+0xd9/0x130 fs/ext4/inode.c:6731
__mark_inode_dirty+0x1f3/0x16e0 fs/fs-writeback.c:2729
generic_update_time fs/inode.c:2253 [inline]
touch_atime+0x65f/0x770 fs/inode.c:2328
file_accessed include/linux/fs.h:2277 [inline]
ext4_file_mmap_prepare+0x56d/0x670 fs/ext4/file.c:901
vfs_mmap_prepare include/linux/fs.h:2069 [inline]
call_mmap_prepare mm/vma.c:2776 [inline]
__mmap_region+0xeb2/0x32c0 mm/vma.c:2863
mmap_region+0x5a8/0x6d0 mm/vma.c:2964
do_mmap+0x12c7/0x1c30 mm/mmap.c:573
vm_mmap_pgoff+0x28d/0x470 mm/util.c:581
ksys_mmap_pgoff+0x3cb/0x610 mm/mmap.c:619
__do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
__se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
__x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f95ef79dec2
RSP: 002b:00007ffc1703c568 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000001b32764000 RCX: 00007f95ef79dec2
RDX: 0000000000000003 RSI: 00000000003c0000 RDI: 0000001b32764000
RBP: 0000000000100001 R08: 0000000000000004 R09: 0000000000040000
R10: 0000000000100001 R11: 0000000000000206 R12: 00000000000003a0
R13: 00000000000927c0 R14: 0000000000137a80 R15: 00007ffc1703c840
INFO: task syz.4.4470:22048 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.4.4470 state:D stack:27488 pid:22048 tgid:22048 ppid:5600 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5526 [inline]
__schedule+0x1259/0x6920 kernel/sched/core.c:7276
__schedule_loop kernel/sched/core.c:7353 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7368
io_schedule+0x8a/0xf0 kernel/sched/core.c:8212
bit_wait_io+0xd/0xe0 kernel/sched/wait_bit.c:258
__wait_on_bit+0x65/0x180 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0xdc/0x110 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:106 [inline]
do_get_write_access+0x836/0x11e0 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d6/0x280 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0x277/0x380 fs/ext4/ext4_jbd2.c:249
ext4_reserve_inode_write+0x1b7/0x330 fs/ext4/inode.c:6509
__ext4_mark_inode_dirty+0x18f/0x910 fs/ext4/inode.c:6694
ext4_dirty_inode+0xd9/0x130 fs/ext4/inode.c:6731
__mark_inode_dirty+0x1f3/0x16e0 fs/fs-writeback.c:2729
generic_update_time fs/inode.c:2253 [inline]
touch_atime+0x65f/0x770 fs/inode.c:2328
file_accessed include/linux/fs.h:2277 [inline]
ext4_file_mmap_prepare+0x56d/0x670 fs/ext4/file.c:901
vfs_mmap_prepare include/linux/fs.h:2069 [inline]
call_mmap_prepare mm/vma.c:2776 [inline]
__mmap_region+0xeb2/0x32c0 mm/vma.c:2863
mmap_region+0x5a8/0x6d0 mm/vma.c:2964
do_mmap+0x12c7/0x1c30 mm/mmap.c:573
vm_mmap_pgoff+0x28d/0x470 mm/util.c:581
ksys_mmap_pgoff+0x3cb/0x610 mm/mmap.c:619
__do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
__se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
__x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3c1839dec2
RSP: 002b:00007ffeca3d6dd8 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000001b32864000 RCX: 00007f3c1839dec2
RDX: 0000000000000003 RSI: 00000000003c0000 RDI: 0000001b32864000
RBP: 0000000000100001 R08: 0000000000000004 R09: 0000000000040000
R10: 0000000000100001 R11: 0000000000000206 R12: 0000000000000364
R13: 00000000000927c0 R14: 0000000000137acc R15: 00007ffeca3d70b0
Showing all locks held in the system:
locks held by khungtaskd/32: 1, last CPU#0:
#0: ffffffff8edec2e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#0: ffffffff8edec2e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8edec2e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x3d/0x184 kernel/locking/lockdep.c:6871
locks held by klogd/4957: 1, last CPU#0:
#0: ffffffff8edec2e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#0: ffffffff8edec2e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8edec2e0 (rcu_read_lock){....}-{1:3}, at: sock_def_readable+0x90/0x600 net/core/sock.c:3658
locks held by getty/5361: 2, on CPU#1:
#0: ffff8880371bc0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc9000321e2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x419/0x14e0 drivers/tty/n_tty.c:2211
locks held by syz-executor/5586: 3, on CPU#1:
#0: ffff88807df351c8 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x11d/0x590 mm/mmap_lock.c:310
#1: ffff888037372558 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x17a/0x440 mm/memory.c:3816
#2: ffff88803737e938 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfa7/0x1390 fs/jbd2/transaction.c:444
locks held by kworker/u8:15/5910: 6, on CPU#1:
#0: ffff888021aa7940 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x1466/0x1b10 kernel/workqueue.c:3371
#1: ffffc900052cfd08 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3372
#2: ffff8880373720e8 (&type->s_umount_key#57){++++}-{4:4}, at: super_trylock_shared+0x21/0xf0 fs/super.c:688
#3: ffff888037370c98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: do_writepages+0x278/0x600 mm/page-writeback.c:2560
#4: ffff88803737e938 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfa7/0x1390 fs/jbd2/transaction.c:444
#5: ffff8880740b6ed8 (&ei->i_data_sem#2){++++}-{4:4}, at: ext4_map_blocks+0x45a/0xdd0 fs/ext4/inode.c:822
locks held by udevd/21286: 1, on CPU#1:
#0: ffff888027a58350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x41a/0xe40 block/bdev.c:990
locks held by pr/ttyS0/21613: 2, last CPU#1:
#0: ffffffff8edd85b8 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:314 [inline]
#0: ffffffff8edd85b8 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:439 [inline]
#0: ffffffff8edd85b8 (console_srcu){....}-{0:0}, at: console_srcu_read_lock+0x49/0x60 kernel/printk/printk.c:291
#1: ffffffff9bc67c78 (&port_lock_key){-.-.}-{3:3}, at: __uart_port_lock_irqsave include/linux/serial_core.h:613 [inline]
#1: ffffffff9bc67c78 (&port_lock_key){-.-.}-{3:3}, at: univ8250_console_device_lock+0x64/0xc0 drivers/tty/serial/8250/8250_core.c:413
locks held by syz.5.4464/22029: 3, on CPU#0:
#0: ffff888072e036c8 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x11d/0x590 mm/mmap_lock.c:310
#1: ffff888037372558 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x17a/0x440 mm/memory.c:3816
#2: ffff88803737e938 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfa7/0x1390 fs/jbd2/transaction.c:444
locks held by syz.0.4468/22046: 3, on CPU#0:
#0: ffff888023ab4378 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:562 [inline]
#0: ffff888023ab4378 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1f5/0x470 mm/util.c:579
#1: ffff888037372460 (sb_writers#5){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2277 [inline]
#1: ffff888037372460 (sb_writers#5){.+.+}-{0:0}, at: ext4_file_mmap_prepare+0x56d/0x670 fs/ext4/file.c:901
#2: ffff88803737e938 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfa7/0x1390 fs/jbd2/transaction.c:444
locks held by syz.3.4469/22047: 3, on CPU#1:
#0: ffff88802b2683b8 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:562 [inline]
#0: ffff88802b2683b8 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1f5/0x470 mm/util.c:579
#1: ffff888037372460 (sb_writers#5){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2277 [inline]
#1: ffff888037372460 (sb_writers#5){.+.+}-{0:0}, at: ext4_file_mmap_prepare+0x56d/0x670 fs/ext4/file.c:901
#2: ffff88803737e938 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfa7/0x1390 fs/jbd2/transaction.c:444
locks held by syz.4.4470/22048: 3, on CPU#0:
#0: ffff88802b26b6b8 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:562 [inline]
#0: ffff88802b26b6b8 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1f5/0x470 mm/util.c:579
#1: ffff888037372460 (sb_writers#5){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2277 [inline]
#1: ffff888037372460 (sb_writers#5){.+.+}-{0:0}, at: ext4_file_mmap_prepare+0x56d/0x670 fs/ext4/file.c:901
#2: ffff88803737e938 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfa7/0x1390 fs/jbd2/transaction.c:444
=============================================
NMI backtrace for cpu 0
CPU: 0 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 08/05/2026
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
nmi_cpu_backtrace.cold+0x12d/0x151 lib/nmi_backtrace.c:123
nmi_trigger_cpumask_backtrace+0x21f/0x2a0 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+0x141/0x190 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
watchdog+0xcb1/0x1030 kernel/hung_task.c:561
kthread+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 21613 Comm: pr/ttyS0 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
RIP: 0010:io_serial_in+0x87/0xb0 drivers/tty/serial/8250/8250_port.c:410
Code: cc 5b fc 48 8d 7d 40 44 89 e1 48 b8 00 00 00 00 00 fc ff df 48 89 fa d3 e3 48 c1 ea 03 80 3c 02 00 75 1a 66 03 5d 40 89 da ec <5b> 0f b6 c0 5d 41 5c e9 4d 32 23 06 e8 38 07 cf fc eb a2 e8 c1 07
RSP: 0018:ffffc9000520f958 EFLAGS: 00000002
RAX: dffffc0000000000 RBX: 00000000000003fd RCX: 0000000000000000
RDX: 00000000000003fd RSI: ffffffff85b04460 RDI: ffffffff9bc67ca0
RBP: ffffffff9bc67c60 R08: 0000000000000001 R09: 000000000000001f
R10: 0000000000000000 R11: 205d323354202020 R12: 0000000000000000
R13: 0000000000000020 R14: fffffbfff378cfe9 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff888123c5d000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000565442300168 CR3: 000000000eb96000 CR4: 00000000003526f0
Call Trace:
serial_in drivers/tty/serial/8250/8250.h:128 [inline]
serial_lsr_in drivers/tty/serial/8250/8250.h:150 [inline]
wait_for_lsr+0x13a/0x210 drivers/tty/serial/8250/8250_port.c:2013
serial8250_fifo_wait_for_lsr_thre+0x5f/0xd0 drivers/tty/serial/8250/8250_port.c:3270
__serial8250_console_fifo_write+0xa5/0x290 drivers/tty/serial/8250/8250_port.c:3345
serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3378 [inline]
__serial8250_console_write drivers/tty/serial/8250/8250_port.c:3429 [inline]
serial8250_console_write+0xf46/0x1330 drivers/tty/serial/8250/8250_port.c:3493
nbcon_emit_next_record+0x8f7/0xa70 kernel/printk/nbcon.c:1070
nbcon_emit_one+0x1a8/0x2b0 kernel/printk/nbcon.c:1157
nbcon_kthread_func+0x613/0x7d0 kernel/printk/nbcon.c:1271
kthread+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245