INFO: task syz.6.233:7807 blocked for more than 143 seconds.
Not tainted 6.16.0-rc2-syzkaller-00162-g41687a5c6f8b #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.233 state:D stack:28264 pid:7807 tgid:7787 ppid:7360 task_flags:0x400140 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5396 [inline]
__schedule+0x16a2/0x4cb0 kernel/sched/core.c:6785
__schedule_loop kernel/sched/core.c:6863 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6878
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6935
rwsem_down_write_slowpath+0xbec/0x1030 kernel/locking/rwsem.c:1176
__down_write_common kernel/locking/rwsem.c:1304 [inline]
__down_write kernel/locking/rwsem.c:1313 [inline]
down_write_nested+0x1b5/0x200 kernel/locking/rwsem.c:1694
inode_lock_nested include/linux/fs.h:914 [inline]
filename_create+0x1f9/0x470 fs/namei.c:4148
do_mknodat+0x184/0x4d0 fs/namei.c:4281
__do_sys_mknodat fs/namei.c:4322 [inline]
__se_sys_mknodat fs/namei.c:4319 [inline]
__x64_sys_mknodat+0xa7/0xc0 fs/namei.c:4319
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f22a078e929
RSP: 002b:00007f22a154c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000103
RAX: ffffffffffffffda RBX: 00007f22a09b6080 RCX: 00007f22a078e929
RDX: 0000000000006000 RSI: 0000200000000180 RDI: ffffffffffffff9c
RBP: 00007f22a0810b39 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000070c R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f22a09b6080 R15: 00007ffe2b9e8538
Showing all locks held in the system:
4 locks held by kworker/u8:1/13:
#0: ffff888143eaa948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff888143eaa948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3321
#1: ffffc90000127bc0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc90000127bc0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3321
#2: ffff88807c8600e0 (&type->s_umount_key#84){++++}-{4:4}, at: super_trylock_shared+0x20/0xf0 fs/super.c:563
#3: ffff88804bf3b918 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_commit_inode+0x1ca/0x530 fs/jfs/inode.c:102
1 lock held by khungtaskd/31:
#0: ffffffff8e13eda0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e13eda0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e13eda0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6770
3 locks held by kworker/u8:6/1112:
2 locks held by getty/5584:
#0: ffff88814cd6d0a0 (&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+0x43e/0x1400 drivers/tty/n_tty.c:2222
1 lock held by udevd/5993:
1 lock held by udevd/6134:
4 locks held by syz.6.233/7788:
2 locks held by syz.6.233/7807:
#0: ffff88807c860428 (sb_writers#17){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557
#1: ffff88804bf3bcc8 (&type->i_mutex_dir_key#10/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:914 [inline]
#1: ffff88804bf3bcc8 (&type->i_mutex_dir_key#10/1){+.+.}-{4:4}, at: filename_create+0x1f9/0x470 fs/namei.c:4148
2 locks held by syz.8.453/9603:
#0: ffff88807c8600e0 (&type->s_umount_key#84){++++}-{4:4}, at: __super_lock fs/super.c:59 [inline]
#0: ffff88807c8600e0 (&type->s_umount_key#84){++++}-{4:4}, at: super_lock+0x2a9/0x3b0 fs/super.c:121
#1: ffff88814332c7d0 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:387 [inline]
#1: ffff88814332c7d0 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: sync_inodes_sb+0x19f/0xa10 fs/fs-writeback.c:2831
2 locks held by syz.1.463/9702:
2 locks held by syz.0.459/9708:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.16.0-rc2-syzkaller-00162-g41687a5c6f8b #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:307 [inline]
watchdog+0xfee/0x1030 kernel/hung_task.c:470
kthread+0x70e/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148
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: 9702 Comm: syz.1.463 Not tainted 6.16.0-rc2-syzkaller-00162-g41687a5c6f8b #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:__update_load_avg_cfs_rq+0x94/0xbd0 kernel/sched/pelt.c:325
Code: b6 04 30 84 c0 0f 85 78 07 00 00 4d 8d af 80 00 00 00 41 8b 5f 18 4c 89 7c 24 20 4d 8d 67 58 4c 89 e0 48 c1 e8 03 80 3c 30 00 <74> 12 4c 89 e7 e8 d2 c5 89 00 48 be 00 00 00 00 00 fc ff df 4d 8b
RSP: 0018:ffffc90000007ae0 EFLAGS: 00000046
RAX: 1ffff110055f3a0b RBX: 0000000000000002 RCX: 7d1a4e83aa670100
RDX: 0000000000000000 RSI: dffffc0000000000 RDI: ffff88802af9d018
RBP: 0000000000000800 R08: ffffffff8f9fe6f7 R09: 1ffffffff1f3fcde
R10: dffffc0000000000 R11: fffffbfff1f3fcdf R12: ffff88802af9d058
R13: ffff88802af9d080 R14: 00000050e1064a9c R15: ffff88802af9d000
FS: 00007f97e21c36c0(0000) GS:ffff888125c83000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa4d6448000 CR3: 0000000025de4000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
update_cfs_rq_load_avg kernel/sched/fair.c:4654 [inline]
update_load_avg+0x572/0x1880 kernel/sched/fair.c:4767
entity_tick kernel/sched/fair.c:5649 [inline]
task_tick_fair+0x72/0x4e0 kernel/sched/fair.c:13125
sched_tick+0x248/0x950 kernel/sched/core.c:5675
update_process_times+0x270/0x2f0 kernel/time/timer.c:2478
tick_sched_handle kernel/time/tick-sched.c:276 [inline]
tick_nohz_handler+0x39a/0x520 kernel/time/tick-sched.c:297
__run_hrtimer kernel/time/hrtimer.c:1761 [inline]
__hrtimer_run_queues+0x4e0/0xc60 kernel/time/hrtimer.c:1825
hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
__sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1056
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1050
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 c1 61 1f 00 41 89 df 4d 85 f6 48 8b 1c 24 75 07 e8 b0 61 1f 00 eb 06 e8 a9 61 1f 00 fb 48 c7 c7 20 30 13 8e <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 b9 36
RSP: 0018:ffffc9000b297620 EFLAGS: 00000287
RAX: ffffffff81a0f9a7 RBX: ffffffff81a0f864 RCX: 0000000000080000
RDX: ffffc9000bd99000 RSI: 000000000004d6f9 RDI: ffffffff8e133020
RBP: ffffc9000b297730 R08: ffffffff8f9fe6f7 R09: 1ffffffff1f3fcde
R10: dffffc0000000000 R11: fffffbfff1f3fcdf R12: dffffc0000000000
R13: 1ffff92001652ec8 R14: 0000000000000200 R15: 0000000000000043
bch2_print_maybe_redirect fs/bcachefs/super.c:137 [inline]
__bch2_print+0x176/0x220 fs/bcachefs/super.c:156
bch2_fs_start+0xc6/0xd90 fs/bcachefs/super.c:1155
bch2_fs_get_tree+0xb02/0x14f0 fs/bcachefs/fs.c:2489
vfs_get_tree+0x92/0x2b0 fs/super.c:1804
do_new_mount+0x24a/0xa40 fs/namespace.c:3885
do_mount fs/namespace.c:4222 [inline]
__do_sys_mount fs/namespace.c:4433 [inline]
__se_sys_mount+0x317/0x410 fs/namespace.c:4410
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f97e13900ca
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:00007f97e21c2e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f97e21c2ef0 RCX: 00007f97e13900ca
RDX: 00002000000000c0 RSI: 00002000000003c0 RDI: 00007f97e21c2eb0
RBP: 00002000000000c0 R08: 00007f97e21c2ef0 R09: 0000000000000810
R10: 0000000000000810 R11: 0000000000000246 R12: 00002000000003c0
R13: 00007f97e21c2eb0 R14: 0000000000005a85 R15: 0000200000000040