rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P3560/1:b..l P6444/1:b..l
(detected by 0, t=10502 jiffies, g=21413, q=119)
task:syz.7.509 state:R running task stack:28800 pid: 6444 ppid: 5778 flags:0x00004004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11bb/0x4390 kernel/sched/core.c:6395
preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6799
irqentry_exit+0x63/0x70 kernel/entry/common.c:432
asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:681
RIP: 0010:__dentry_path+0x2af/0x5c0 fs/d_path.c:344
Code: ff df 0f 8e d4 01 00 00 49 ff cf 4c 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0 75 55 41 c6 07 2f 49 8d 7e 50 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 05 e8 55 e3 e7 ff ff cd 4d 8b 6e 50 4d 39 ee 0f
RSP: 0018:ffffc90003aaf968 EFLAGS: 00000a06
RAX: 1ffff11028100182 RBX: 0000000000001818 RCX: ffff88802215bb80
RDX: 0000000000000000 RSI: 0000000000000ff9 RDI: ffff888140800c10
RBP: 0000000000000ff9 R08: dffffc0000000000 R09: fffffbfff1ad32b6
R10: fffffbfff1ad32b6 R11: 1ffffffff1ad32b5 R12: 0000000000000004
R13: dffffc0000000000 R14: ffff888140800bc0 R15: ffff8880224c2ff8
dentry_path_raw+0x80/0xc0 fs/d_path.c:369
tomoyo_get_dentry_path security/tomoyo/realpath.c:131 [inline]
tomoyo_get_local_path+0xce/0x740 security/tomoyo/realpath.c:157
tomoyo_realpath_from_path+0x2dc/0x610 security/tomoyo/realpath.c:-1
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_path_number_perm+0x1d5/0x5d0 security/tomoyo/file.c:723
security_file_ioctl+0x6c/0xa0 security/security.c:1555
__do_sys_ioctl fs/ioctl.c:868 [inline]
__se_sys_ioctl+0x48/0x170 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fa3d6981acb
RSP: 002b:00007fa3d4be9050 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fa3d6bd9038 RCX: 00007fa3d6981acb
RDX: 0000000000000000 RSI: 0000000000006364 RDI: 00000000000000d8
RBP: 0000000000000000 R08: 0000000000000000 R09: 00007fff43a57f97
R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fa3d6bd9038 R14: 00007fff43a57eb0 R15: 00007fff43a57f98
</TASK>
task:udevd state:R running task stack:23296 pid: 3560 ppid: 1 flags:0x00004002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11bb/0x4390 kernel/sched/core.c:6395
preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6799
irqentry_exit+0x63/0x70 kernel/entry/common.c:432
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:lock_is_held_type+0x13a/0x190 kernel/locking/lockdep.c:5671
Code: 75 40 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 46 41 f7 c5 00 02 00 00 74 01 fb 65 48 8b 04 25 28 00 00 00 <48> 3b 44 24 08 75 3c 89 e8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc90002e8f838 EFLAGS: 00000206
RAX: 52eeddf69a93ec00 RBX: ffff88807d465940 RCX: 52eeddf69a93ec00
RDX: 0000000000000000 RSI: ffffffff8a0b2ac0 RDI: ffffffff8a59a4c0
RBP: 0000000000000001 R08: dffffc0000000000 R09: fffff52000031cec
R10: fffff52000031cec R11: 1ffff92000031ceb R12: 0000000000000000
R13: 0000000000000246 R14: ffffffff8c11c660 R15: ffff88807d466430
hlist_bl_first_rcu include/linux/rculist_bl.h:24 [inline]
__d_lookup+0x162/0x760 fs/dcache.c:2430
lookup_fast+0xd7/0x710 fs/namei.c:1621
walk_component+0x81/0x460 fs/namei.c:1972
link_path_walk+0x662/0xd40 fs/namei.c:-1
path_lookupat+0x9d/0x440 fs/namei.c:2454
filename_lookup+0x1e2/0x4f0 fs/namei.c:2484
user_path_at_empty+0x40/0x190 fs/namei.c:2883
do_readlinkat+0xd4/0x480 fs/stat.c:442
__do_sys_readlink fs/stat.c:475 [inline]
__se_sys_readlink fs/stat.c:472 [inline]
__x64_sys_readlink+0x7b/0x90 fs/stat.c:472
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f0dca1353a7
RSP: 002b:00007fff42556de8 EFLAGS: 00000246 ORIG_RAX: 0000000000000059
RAX: ffffffffffffffda RBX: 00007fff425572c0 RCX: 00007f0dca1353a7
RDX: 0000000000000400 RSI: 00007fff42556df0 RDI: 00007fff425572c0
RBP: 00007fff42556df0 R08: 00000000000001e0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000400
R13: 000055b9b2c75100 R14: 000055b9d4f278c0 R15: 00007fff42557cf0
</TASK>
rcu: rcu_preempt kthread starved for 10322 jiffies! g21413 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt state:R running task stack:27496 pid: 15 ppid: 2 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11bb/0x4390 kernel/sched/core.c:6395
schedule+0x11b/0x1e0 kernel/sched/core.c:6478
schedule_timeout+0x15c/0x280 kernel/time/timer.c:1914
rcu_gp_fqs_loop+0x29e/0x11b0 kernel/rcu/tree.c:1972
rcu_gp_kthread+0x98/0x350 kernel/rcu/tree.c:2145
kthread+0x436/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
</TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
NMI backtrace for cpu 1 skipped: idling at default_idle+0xb/0x10 arch/x86/kernel/process.c:729