INFO: task syz-executor.2:10624 blocked for more than 143 seconds.
Not tainted 5.5.0-rc2-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2 D24280 10624 1 0x00000004
Call Trace:
context_switch kernel/sched/core.c:3385 [inline]
__schedule+0x934/0x1f90 kernel/sched/core.c:4081
schedule+0xdc/0x2b0 kernel/sched/core.c:4155
rwsem_down_write_slowpath+0x706/0xf80 kernel/locking/rwsem.c:1238
__down_write kernel/locking/rwsem.c:1392 [inline]
down_write+0x13c/0x150 kernel/locking/rwsem.c:1535
inode_lock include/linux/fs.h:791 [inline]
vfs_unlink+0xd5/0x620 fs/namei.c:3994
do_unlinkat+0x3f7/0x6d0 fs/namei.c:4067
__do_sys_unlink fs/namei.c:4114 [inline]
__se_sys_unlink fs/namei.c:4112 [inline]
__x64_sys_unlink+0x42/0x50 fs/namei.c:4112
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a667
Code: 00 66 90 b8 58 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 4d b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 2d b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fff75721c18 EFLAGS: 00000246 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045a667
RDX: 00007fff75721c30 RSI: 00007fff75721c30 RDI: 00007fff75721cc0
RBP: 0000000000000590 R08: 0000000000000000 R09: 0000000000000009
R10: 0000000000000003 R11: 0000000000000246 R12: 00007fff75722d50
R13: 0000000002915940 R14: 0000000000000000 R15: 00007fff75722d50
Showing all locks held in the system:
1 lock held by khungtaskd/989:
#0: ffffffff899a5640 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x279 kernel/locking/lockdep.c:5334
1 lock held by rsyslogd/9051:
#0: ffff8880a02de3a0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801
2 locks held by getty/9141:
#0: ffff88809fd37090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc9000175b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by getty/9142:
#0: ffff88809e6b5090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc900017ab2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by getty/9143:
#0: ffff8880a49fc090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc900017fb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by getty/9144:
#0: ffff8880a942e090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc9000178b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by getty/9145:
#0: ffff8880a490a090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc900017eb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by getty/9146:
#0: ffff888099be9090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc900017db2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by getty/9147:
#0: ffff888214cac090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc900011342e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
3 locks held by syz-executor.2/10624:
#0: ffff88809a6f4428 (sb_writers#3){.+.+}, at: sb_start_write include/linux/fs.h:1650 [inline]
#0: ffff88809a6f4428 (sb_writers#3){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:354
#1: ffff888027c5b888 (&type->i_mutex_dir_key#3/1){+.+.}, at: inode_lock_nested include/linux/fs.h:826 [inline]
#1: ffff888027c5b888 (&type->i_mutex_dir_key#3/1){+.+.}, at: do_unlinkat+0x29f/0x6d0 fs/namei.c:4053
#2: ffff88808c5d8988 (&sb->s_type->i_mutex_key#11){++++}, at: inode_lock include/linux/fs.h:791 [inline]
#2: ffff88808c5d8988 (&sb->s_type->i_mutex_key#11){++++}, at: vfs_unlink+0xd5/0x620 fs/namei.c:3994
2 locks held by syz-executor.2/23552:
#0: ffff88809a6f4428 (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2885 [inline]
#0: ffff88809a6f4428 (sb_writers#3){.+.+}, at: vfs_write+0x485/0x5d0 fs/read_write.c:557
#1: ffff88808c5d8988 (&sb->s_type->i_mutex_key#11){++++}, at: inode_lock include/linux/fs.h:791 [inline]
#1: ffff88808c5d8988 (&sb->s_type->i_mutex_key#11){++++}, at: ext4_buffered_write_iter+0xba/0x460 fs/ext4/file.c:246
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 989 Comm: khungtaskd Not tainted 5.5.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x197/0x210 lib/dump_stack.c:118
nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x23b/0x28b lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline]
watchdog+0xb11/0x10c0 kernel/hung_task.c:289
kthread+0x361/0x430 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.5.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:look_up_lock_class kernel/locking/lockdep.c:812 [inline]
RIP: 0010:register_lock_class+0xca/0x1850 kernel/locking/lockdep.c:1185
Code: 08 0a 45 85 db 0f 84 ff 04 00 00 41 83 fd 07 0f 87 e9 05 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 80 3c 02 00 <0f> 85 a6 10 00 00 4c 8b 3b 4d 85 ff 0f 84 1e 0d 00 00 49 bc eb 83
RSP: 0018:ffffc90000da8a90 EFLAGS: 00000046
RAX: dffffc0000000000 RBX: ffffc90000da8d50 RCX: 0000000000000000
RDX: 1ffff920001b51aa RSI: 0000000000000000 RDI: ffffc90000da8d50
RBP: ffffc90000da8b58 R08: 1ffff920001b515a R09: ffffffff8b63c520
R10: fffffbfff14f33b0 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: ffffc90000da8b30 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000017d1000 CR3: 00000000a3961000 CR4: 00000000001406e0
DR0: 0000000020000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
__lock_acquire+0xf4/0x4a00 kernel/locking/lockdep.c:3837
lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4485
call_timer_fn+0x12c/0x780 kernel/time/timer.c:1401
expire_timers kernel/time/timer.c:1449 [inline]
__run_timers kernel/time/timer.c:1773 [inline]
__run_timers kernel/time/timer.c:1740 [inline]
run_timer_softirq+0x6c3/0x1790 kernel/time/timer.c:1786
__do_softirq+0x262/0x98c kernel/softirq.c:292
invoke_softirq kernel/softirq.c:373 [inline]
irq_exit+0x19b/0x1e0 kernel/softirq.c:413
exiting_irq arch/x86/include/asm/apic.h:536 [inline]
smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1137
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61
Code: 08 3b ea f9 eb 8a cc cc cc cc cc cc e9 07 00 00 00 0f 00 2d 34 eb 5f 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d 24 eb 5f 00 fb f4 cc 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 be 2c 9a f9 e8 29
RSP: 0018:ffffc90000d3fd68 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff132669e RBX: ffff8880a99fa340 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffff8880a99fabd4
RBP: ffffc90000d3fd98 R08: ffff8880a99fa340 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: ffffffff8a799d80 R14: 0000000000000000 R15: 0000000000000001
arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:690
default_idle_call+0x84/0xb0 kernel/sched/idle.c:94
cpuidle_idle_call kernel/sched/idle.c:154 [inline]
do_idle+0x3c8/0x6e0 kernel/sched/idle.c:269
cpu_startup_entry+0x1b/0x20 kernel/sched/idle.c:361
start_secondary+0x2f4/0x410 arch/x86/kernel/smpboot.c:264
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:242