INFO: task syz.5.1085:16295 blocked for more than 143 seconds.
Not tainted 6.15.0-rc6-syzkaller-00208-g3c21441eeffc #0
Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.1085 state:D stack:26088 pid:16295 tgid:16270 ppid:15310 task_flags:0x40044c flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x168f/0x4c70 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6860
request_wait_answer fs/fuse/dev.c:564 [inline]
__fuse_request_send fs/fuse/dev.c:578 [inline]
__fuse_simple_request+0xf12/0x18d0 fs/fuse/dev.c:672
fuse_simple_request fs/fuse/fuse_i.h:1237 [inline]
fuse_flush+0x5bc/0x860 fs/fuse/file.c:557
filp_flush+0xbd/0x190 fs/open.c:1541
filp_close+0x1d/0x40 fs/open.c:1554
close_files fs/file.c:479 [inline]
put_files_struct+0x1ba/0x350 fs/file.c:494
do_exit+0x888/0x2550 kernel/exit.c:948
do_group_exit+0x21c/0x2d0 kernel/exit.c:1102
get_signal+0x125e/0x1310 kernel/signal.c:3034
arch_do_signal_or_restart+0x95/0x780 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [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+0x8b/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: 0033:0x7f12e158d41f
RSP: 002b:00007f12e23d7df0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: 0000000000f85000 RBX: 0000000001000000 RCX: 00007f12e158d41f
RDX: 0000000001000000 RSI: 00007f12d6e00000 RDI: 0000000000000009
RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000000046fd
R10: 0000200000004802 R11: 0000000000000293 R12: 0000000000000009
R13: 00007f12e23d7ef0 R14: 00007f12e23d7eb0 R15: 00007f12d6e00000
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8df3dce0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8df3dce0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8df3dce0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6764
2 locks held by getty/5582:
#0: ffff88814d80f0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90002fee2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
1 lock held by udevd/17615:
1 lock held by syz-executor/17851:
#0: ffffffff8df437b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:336 [inline]
#0: ffffffff8df437b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3b7/0x730 kernel/rcu/tree_exp.h:998
3 locks held by syz.3.1287/18495:
#0: ffff888084a04228 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:161 [inline]
#0: ffff888084a04228 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:253 [inline]
#0: ffff888084a04228 (&c->btree_trans_barrier){.+.+}-{0:0}, at: __bch2_trans_get+0x806/0xda0 fs/bcachefs/btree_iter.c:3391
#1: ffff88803d424140 (bcachefs_btree){+.+.}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:161 [inline]
#1: ffff88803d424140 (bcachefs_btree){+.+.}-{0:0}, at: srcu_read_lock include/linux/srcu.h:253 [inline]
#1: ffff88803d424140 (bcachefs_btree){+.+.}-{0:0}, at: __bch2_trans_get+0x806/0xda0 fs/bcachefs/btree_iter.c:3391
#2: ffff888084a04860 (&c->mark_lock){++++}-{0:0}, at: bch2_accounting_read+0x14d/0x55a0 fs/bcachefs/disk_accounting.c:725
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc6-syzkaller-00208-g3c21441eeffc #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+0x70e/0x8a0 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
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: 18495 Comm: syz.3.1287 Not tainted 6.15.0-rc6-syzkaller-00208-g3c21441eeffc #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:delay_tsc+0x5b/0xc0 arch/x86/lib/delay.c:79
Code: 90 49 89 d7 49 c1 e7 20 49 09 c7 4d 29 f7 49 39 df 73 53 bf 01 00 00 00 e8 52 b8 42 f6 65 8b 05 9b 37 24 07 85 c0 74 1c f3 90 01 00 00 00 e8 8b b6 42 f6 e8 e6 38 01 00 39 c5 75 0e 0f 01 f9
RSP: 0018:ffffc90003d2ec70 EFLAGS: 00000082
RAX: 0000000080000002 RBX: 0000000000000899 RCX: 0000000000000000
RDX: 00000000000001e6 RSI: ffffffff8bc10640 RDI: 00000000ffffffff
RBP: 0000000000000001 R08: ffff8880244e0237 R09: 1ffff1100489c046
R10: dffffc0000000000 R11: ffffffff8b4e3840 R12: 1ffffffff3363d8a
R13: 00000000ffffffff R14: 000001e6f4b4efc5 R15: 00000000000000f0
FS: 00007f1a316a66c0(0000) GS:ffff8881261f9000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6889b7d2d8 CR3: 0000000055022000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
udelay include/asm-generic/delay.h:62 [inline]
wait_for_lsr+0x160/0x2f0 drivers/tty/serial/8250/8250_port.c:2104
fifo_wait_for_lsr drivers/tty/serial/8250/8250_port.c:3348 [inline]
serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3371 [inline]
serial8250_console_write+0x134c/0x1ba0 drivers/tty/serial/8250/8250_port.c:3456
console_emit_next_record kernel/printk/printk.c:3138 [inline]
console_flush_all+0x725/0xc40 kernel/printk/printk.c:3226
__console_flush_and_unlock kernel/printk/printk.c:3285 [inline]
console_unlock+0xc4/0x270 kernel/printk/printk.c:3325
vprintk_emit+0x5b7/0x7a0 kernel/printk/printk.c:2450
bch2_print_maybe_redirect fs/bcachefs/super.c:110 [inline]
__bch2_print+0x176/0x220 fs/bcachefs/super.c:129
__bch2_fs_read_write+0xea/0x470 fs/bcachefs/super.c:440
bch2_fs_read_write_early+0x26/0x40 fs/bcachefs/super.c:526
bch2_run_recovery_pass+0xdf/0x1d0 fs/bcachefs/recovery_passes.c:227
bch2_run_recovery_passes+0x2a0/0xdb0 fs/bcachefs/recovery_passes.c:280
bch2_fs_recovery+0x2399/0x37b0 fs/bcachefs/recovery.c:937
bch2_fs_start+0x70b/0xae0 fs/bcachefs/super.c:1096
bch2_fs_get_tree+0xad7/0x13b0 fs/bcachefs/fs.c:2507
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: 0033:0x7f1a3079010a
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:00007f1a316a5e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f1a316a5ef0 RCX: 00007f1a3079010a
RDX: 00002000000000c0 RSI: 0000200000000000 RDI: 00007f1a316a5eb0
RBP: 00002000000000c0 R08: 00007f1a316a5ef0 R09: 0000000000800000
R10: 0000000000800000 R11: 0000000000000246 R12: 0000200000000000
R13: 00007f1a316a5eb0 R14: 0000000000005953 R15: 0000200000000100