INFO: task syz-executor:6312 blocked for more than 143 seconds.
Not tainted 6.15.0-rc6-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:16824 pid:6312 tgid:6312 ppid:1 task_flags:0x400140 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x16e2/0x4cd0 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6860
io_schedule+0x81/0xe0 kernel/sched/core.c:7742
folio_wait_bit_common+0x6b0/0xb90 mm/filemap.c:1317
__folio_lock mm/filemap.c:1664 [inline]
folio_lock include/linux/pagemap.h:1137 [inline]
__filemap_get_folio+0x139/0xaf0 mm/filemap.c:1917
truncate_inode_pages_range+0x3ed/0xda0 mm/truncate.c:384
evict+0x517/0x9c0 fs/inode.c:812
dispose_list fs/inode.c:852 [inline]
evict_inodes+0x636/0x6c0 fs/inode.c:906
generic_shutdown_super+0x9a/0x2c0 fs/super.c:627
kill_block_super+0x44/0x90 fs/super.c:1710
deactivate_locked_super+0xbc/0x130 fs/super.c:473
cleanup_mnt+0x425/0x4c0 fs/namespace.c:1431
task_work_run+0x1d4/0x260 kernel/task_work.c:227
resume_user_mode_work+0x5e/0x80 include/linux/resume_user_mode.h:50
exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x9a/0x120 kernel/entry/common.c:218
do_syscall_64+0x103/0x210 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa35118fc97
RSP: 002b:00007ffe913f5378 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fa35121089d RCX: 00007fa35118fc97
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffe913f5430
RBP: 00007ffe913f5430 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffe913f64c0
R13: 00007fa35121089d R14: 00000000000c9536 R15: 00007ffe913f6500
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8df3d860 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8df3d860 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8df3d860 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6764
2 locks held by getty/5580:
#0: ffff8880337390a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90002ffe2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
1 lock held by syz-executor/6312:
#0: ffff88807f2e00e0 (&type->s_umount_key#118){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88807f2e00e0 (&type->s_umount_key#118){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88807f2e00e0 (&type->s_umount_key#118){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:505
1 lock held by udevd/7000:
1 lock held by syz.1.9677/27585:
#0: ffff88807f2e00e0 (&type->s_umount_key#118){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff88807f2e00e0 (&type->s_umount_key#118){++++}-{4:4}, at: super_lock+0x2a9/0x3b0 fs/super.c:120
2 locks held by syz.6.10411/29245:
#0: ffff88804d7320e0 (&type->s_umount_key#83/1){+.+.}-{4:4}, at: alloc_super+0x204/0x970 fs/super.c:344
#1: ffffffff8e044c40 (fs_reclaim){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#1: ffffffff8e044c40 (fs_reclaim){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#1: ffffffff8e044c40 (fs_reclaim){+.+.}-{0:0}, at: class_rcu_constructor include/linux/rcupdate.h:1155 [inline]
#1: ffffffff8e044c40 (fs_reclaim){+.+.}-{0:0}, at: unwind_next_frame+0xa5/0x2390 arch/x86/kernel/unwind_orc.c:479
4 locks held by udevadm/29258:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc6-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:274 [inline]
watchdog+0xfee/0x1030 kernel/hung_task.c:437
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x4e/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 29245 Comm: syz.6.10411 Not tainted 6.15.0-rc6-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:lock_is_held_type+0x123/0x190 kernel/locking/lockdep.c:5940
Code: e8 92 17 00 00 b8 ff ff ff ff 65 0f c1 05 d5 90 1f 07 83 f8 01 75 44 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 <75> 4c 41 f7 c4 00 02 00 00 74 01 fb 65 48 8b 05 89 54 1f 07 48 3b
RSP: 0018:ffffc90000007a28 EFLAGS: 00000046
RAX: 0000000000000001 RBX: 0000000000000001 RCX: ea52387a6ba07600
RDX: 0000000000000000 RSI: ffffffff8d93622d RDI: ffffffff8bc1d2e0
RBP: 00000000ffffffff R08: ffff88801bea094f R09: 1ffff110037d4129
R10: dffffc0000000000 R11: ffffed10037d412a R12: 0000000000000046
R13: ffff888024695a00 R14: ffffffff8df3d860 R15: 0000000000000003
FS: 00007f60d840f6c0(0000) GS:ffff8881260c9000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa92438b000 CR3: 000000006984b000 CR4: 0000000000350ef0
Call Trace:
select_idle_sibling kernel/sched/fair.c:7924 [inline]
select_task_rq_fair+0x1dec/0x34e0 kernel/sched/fair.c:8637
select_task_rq kernel/sched/core.c:3583 [inline]
try_to_wake_up+0x51e/0x1290 kernel/sched/core.c:4313
call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1789
expire_timers kernel/time/timer.c:1840 [inline]
__run_timers kernel/time/timer.c:2414 [inline]
__run_timer_base+0x61a/0x860 kernel/time/timer.c:2426
run_timer_base kernel/time/timer.c:2435 [inline]
run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2445
handle_softirqs+0x286/0x870 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2061 [inline]
RIP: 0010:vprintk_emit+0x58f/0x7a0 kernel/printk/printk.c:2449
Code: 85 32 01 00 00 e8 81 f2 1e 00 41 89 df 4d 85 f6 48 8b 1c 24 75 07 e8 70 f2 1e 00 eb 06 e8 69 f2 1e 00 fb 48 c7 c7 80 1a f3 8d <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 f9 3f
RSP: 0018:ffffc9000c107400 EFLAGS: 00000246
RAX: ffffffff81a0dd07 RBX: ffffffff81a0dbc4 RCX: 0000000000080000
RDX: ffffc90020001000 RSI: 000000000007ffff RDI: ffffffff8df31a80
RBP: ffffc9000c107510 R08: ffffffff8f7ef677 R09: 1ffffffff1efdece
R10: dffffc0000000000 R11: fffffbfff1efdecf R12: dffffc0000000000
R13: 1ffff92001820e84 R14: 0000000000000200 R15: 0000000000000034
_printk+0xcf/0x120 kernel/printk/printk.c:2475
_btrfs_printk+0x562/0x5b0 fs/btrfs/messages.c:248
btrfs_start_pre_rw_mount+0xda4/0x1180 fs/btrfs/disk-io.c:3084
open_ctree+0x2075/0x2800 fs/btrfs/disk-io.c:3614
btrfs_fill_super+0x19d/0x2e0 fs/btrfs/super.c:972
btrfs_get_tree_super fs/btrfs/super.c:1897 [inline]
btrfs_get_tree+0x107c/0x1620 fs/btrfs/super.c:2092
vfs_get_tree+0x92/0x2b0 fs/super.c:1759
fc_mount+0x1c/0xb0 fs/namespace.c:1289
btrfs_get_tree_subvol fs/btrfs/super.c:2050 [inline]
btrfs_get_tree+0x67d/0x1620 fs/btrfs/super.c:2093
vfs_get_tree+0x92/0x2b0 fs/super.c:1759
do_new_mount+0x24a/0xa40 fs/namespace.c:3881
do_mount fs/namespace.c:4221 [inline]
__do_sys_mount fs/namespace.c:4432 [inline]
__se_sys_mount+0x317/0x410 fs/namespace.c:4409
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f60d759010a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f60d840ee68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f60d840eef0 RCX: 00007f60d759010a
RDX: 00002000000051c0 RSI: 0000200000005200 RDI: 00007f60d840eeb0
RBP: 00002000000051c0 R08: 00007f60d840eef0 R09: 0000000001204408
R10: 0000000001204408 R11: 0000000000000246 R12: 0000200000005200
R13: 00007f60d840eeb0 R14: 00000000000051ab R15: 00002000000003c0