INFO: task syz.1.8515:30819 blocked for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.8515 state:D stack:28160 pid:30819 tgid:30817 ppid:19793 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5352 [inline]
__schedule+0x1665/0x5590 kernel/sched/core.c:6964
__schedule_loop kernel/sched/core.c:7047 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7062
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7119
__mutex_lock_common kernel/locking/mutex.c:692 [inline]
__mutex_lock+0x7fe/0x1300 kernel/locking/mutex.c:776
bdev_open+0xe0/0xd30 block/bdev.c:961
blkdev_open+0x470/0x610 block/fops.c:697
do_dentry_open+0x785/0x14e0 fs/open.c:949
vfs_open+0x3b/0x340 fs/open.c:1081
do_open fs/namei.c:4693 [inline]
path_openat+0x2e08/0x3860 fs/namei.c:4852
do_file_open+0x23e/0x4a0 fs/namei.c:4881
do_sys_openat2+0x113/0x200 fs/open.c:1366
do_sys_open fs/open.c:1372 [inline]
__do_sys_openat fs/open.c:1388 [inline]
__se_sys_openat fs/open.c:1383 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1383
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff38175cfce
RSP: 002b:00007ff3825f1b28 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007ff3825f26c0 RCX: 00007ff38175cfce
RDX: 0000000000008000 RSI: 00007ff3825f1c00 RDI: ffffffffffffff9c
RBP: 00007ff3825f1c00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: cccccccccccccccd
R13: 00007ff381a16038 R14: 00007ff381a15fa0 R15: 00007fffe9f332b8
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8e75f420 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#0: ffffffff8e75f420 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#0: ffffffff8e75f420 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5585:
#0: ffff8880330680a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0 drivers/tty/n_tty.c:2211
1 lock held by udevd/5877:
#0: ffff888027644358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30 block/bdev.c:961
1 lock held by udevd/6572:
1 lock held by udevd/24726:
#0: ffff888027640358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30 block/bdev.c:961
1 lock held by syz.1.8515/30819:
#0: ffff888027644358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30 block/bdev.c:961
1 lock held by syz.9.9599/1609:
5 locks held by syz.0.9601/1613:
1 lock held by syz.7.9581/1623:
#0: ffffffff8e765580 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x580 kernel/rcu/tree.c:3828
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/27/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [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+0x1002/0x1060 kernel/hung_task.c:561
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 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: 1613 Comm: syz.0.9601 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/27/2026
RIP: 0010:mark_lock_accessed kernel/locking/lockdep.c:1530 [inline]
RIP: 0010:__bfs kernel/locking/lockdep.c:1768 [inline]
RIP: 0010:__bfs_backwards kernel/locking/lockdep.c:1860 [inline]
RIP: 0010:check_irq_usage kernel/locking/lockdep.c:2796 [inline]
RIP: 0010:check_prev_add kernel/locking/lockdep.c:3169 [inline]
RIP: 0010:check_prevs_add kernel/locking/lockdep.c:3284 [inline]
RIP: 0010:validate_chain kernel/locking/lockdep.c:3908 [inline]
RIP: 0010:__lock_acquire+0x1839/0x2cf0 kernel/locking/lockdep.c:5237
Code: 9d 59 84 14 4d 85 e4 0f 84 b2 01 00 00 49 8b 44 24 10 48 85 c0 0f 84 1c 0d 00 00 8b 0d 88 59 84 14 39 48 5c 0f 84 67 ff ff ff <89> 48 5c 49 8b 44 24 30 48 85 c0 74 25 41 0f b6 4c 24 2a 89 ca 80
RSP: 0000:ffffc90006126100 EFLAGS: 00000093
RAX: ffffffff93d40e20 RBX: 00000000000003cc RCX: 00000000000c5e18
RDX: 0000000000000000 RSI: ffff888027af8bf8 RDI: 00000000000003cc
RBP: 7748800e2571a034 R08: ffffc900061260c8 R09: 0000000000000020
R10: dffffc0000000000 R11: ffffffff81a300b0 R12: ffffffff96e172f8
R13: ffff888027af8bf8 R14: ffff888027af8000 R15: 0000000000000017
FS: 00007f4b97dcd6c0(0000) GS:ffff88812553d000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f412ff8 CR3: 0000000036214000 CR4: 00000000003526f0
Call Trace:
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
class_raw_spinlock_constructor include/linux/spinlock.h:535 [inline]
__hrtimer_rearm_deferred+0x9c/0x480 kernel/time/hrtimer.c:2049
hrtimer_rearm_deferred_tif include/linux/hrtimer_rearm.h:53 [inline]
hrtimer_rearm_deferred include/linux/hrtimer_rearm.h:62 [inline]
irqentry_exit+0x66f/0x700 kernel/entry/common.c:242
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2039 [inline]
RIP: 0010:vprintk_emit+0x45d/0x560 kernel/printk/printk.c:2478
Code: 0f 84 44 ff ff ff e8 62 28 21 00 fb eb 44 e8 5a 28 21 00 e8 05 08 0e 0a 4d 85 f6 74 94 e8 4b 28 21 00 fb 48 c7 c7 40 18 75 8e <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 3b 17
RSP: 0000:ffffc90006126420 EFLAGS: 00000246
RAX: ffffffff81a57b65 RBX: ffffffff81a579df RCX: 0000000000080000
RDX: ffffc9001b971000 RSI: 000000000007ffff RDI: ffffffff8e751840
RBP: ffffc900061264d0 R08: ffffffff901250f7 R09: 1ffffffff2024a1e
R10: dffffc0000000000 R11: fffffbfff2024a1f R12: 0000000000000000
R13: 000000000000007c R14: 0000000000000200 R15: 1ffff92000c24c88
_printk+0xdd/0x130 kernel/printk/printk.c:2504
__ext4_error+0x342/0x360 fs/ext4/super.c:823
ext4_read_block_bitmap_nowait+0x794/0x9d0 fs/ext4/balloc.c:516
ext4_mb_init_cache+0x547/0x1740 fs/ext4/mballoc.c:1428
ext4_mb_init_group+0x6d0/0xb30 fs/ext4/mballoc.c:1636
ext4_mb_good_group_nolock fs/ext4/mballoc.c:2827 [inline]
ext4_mb_scan_group+0x1251/0x18e0 fs/ext4/mballoc.c:2964
ext4_mb_scan_groups_linear+0xe8/0x360 fs/ext4/mballoc.c:1176
ext4_mb_scan_groups fs/ext4/mballoc.c:1206 [inline]
ext4_mb_regular_allocator+0x882/0x2bd0 fs/ext4/mballoc.c:3056
ext4_mb_new_blocks+0xd3f/0x4780 fs/ext4/mballoc.c:6316
ext4_alloc_branch fs/ext4/indirect.c:340 [inline]
ext4_ind_map_blocks+0xe96/0x22c0 fs/ext4/indirect.c:635
ext4_map_create_blocks+0xc1/0x540 fs/ext4/inode.c:621
ext4_map_blocks+0x7cd/0x11d0 fs/ext4/inode.c:812
_ext4_get_block+0x1e3/0x470 fs/ext4/inode.c:912
ext4_block_write_begin+0xb14/0x1950 fs/ext4/inode.c:1199
ext4_convert_inline_data_to_extent+0x670/0xde0 fs/ext4/ext4_jbd2.h:-1
ext4_write_begin+0x357/0x18c0 fs/ext4/inode.c:1303
ext4_da_write_begin+0x355/0xd80 fs/ext4/inode.c:3126
generic_perform_write+0x2e2/0x8f0 mm/filemap.c:4320
ext4_buffered_write_iter+0xce/0x3a0 fs/ext4/file.c:299
ext4_file_write_iter+0x298/0x1bf0 fs/ext4/file.c:-1
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x61d/0xb90 fs/read_write.c:688
ksys_pwrite64 fs/read_write.c:795 [inline]
__do_sys_pwrite64 fs/read_write.c:803 [inline]
__se_sys_pwrite64 fs/read_write.c:800 [inline]
__x64_sys_pwrite64+0x199/0x230 fs/read_write.c:800
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4b96f9c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4b97dcd028 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007f4b97215fa0 RCX: 00007f4b96f9c799
RDX: 0000000000000001 RSI: 00002000000001c0 RDI: 0000000000000005
RBP: 00007f4b97032c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000008000c61 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4b97216038 R14: 00007f4b97215fa0 R15: 00007fff5610e888