rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P8237/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=61225, q=244 ncpus=2)
task:udevd state:R running task stack:24304 pid:8237 tgid:8237 ppid:4976 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5520 [inline]
__schedule+0x17db/0x58f0 kernel/sched/core.c:7270
preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7592
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x14f/0x910 kernel/entry/common.c:167
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__seqprop_spinlock_sequence include/linux/seqlock.h:228 [inline]
RIP: 0010:read_seqbegin+0xf9/0x180 include/linux/seqlock.h:838
Code: 85 e4 75 16 e8 28 a3 6a ff eb 15 e8 21 a3 6a ff e8 bc cc 86 09 4d 85 e4 74 ea e8 12 a3 6a ff fb 49 be 00 00 00 00 00 fc ff df <49> 89 df 49 c1 ef 03 43 0f b6 04 37 84 c0 75 2a 8b 2b 89 ee 83 e6
RSP: 0018:ffffc900026cf5f0 EFLAGS: 00000293
RAX: ffffffff825d180e RBX: ffffffff8ea14980 RCX: ffff888026233e80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900026cf6f0 R08: ffffffff907a137f R09: 1ffffffff20f426f
R10: dffffc0000000000 R11: fffffbfff20f4270 R12: 0000000000000200
R13: ffffffff8ea14980 R14: dffffc0000000000 R15: ffffffff825cf776
read_seqbegin_or_lock include/linux/seqlock.h:1150 [inline]
prepend_path+0x116/0x840 fs/d_path.c:166
d_absolute_path+0xa1/0x140 fs/d_path.c:234
tomoyo_get_absolute_path security/tomoyo/realpath.c:101 [inline]
tomoyo_realpath_from_path+0x30d/0x640 security/tomoyo/realpath.c:271
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_check_open_permission+0x229/0x470 security/tomoyo/file.c:776
security_file_open+0xa9/0x240 security/security.c:2739
do_dentry_open+0x4a0/0x1380 fs/open.c:973
vfs_open+0x3b/0x340 fs/open.c:1101
do_open fs/namei.c:4837 [inline]
path_openat+0x1443/0x1d60 fs/namei.c:5000
do_file_open+0x23e/0x4a0 fs/namei.c:5029
do_sys_openat2+0x115/0x200 fs/open.c:1417
do_sys_open fs/open.c:1423 [inline]
__do_sys_openat fs/open.c:1439 [inline]
__se_sys_openat fs/open.c:1434 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1434
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fab872a7407
RSP: 002b:00007ffcdc2dd7c0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fab87944880 RCX: 00007fab872a7407
RDX: 00000000000a0241 RSI: 00007ffcdc2de480 RDI: ffffffffffffff9c
RBP: 000055d078000d00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000124 R11: 0000000000000202 R12: 000055d077fdbba0
R13: 00007ffcdc2de480 R14: 00007ffcdc2de080 R15: 00007ffcdc2ddc80
rcu: rcu_preempt kthread starved for 10538 jiffies! g61225 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->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:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5520 [inline]
__schedule+0x17db/0x58f0 kernel/sched/core.c:7270
__schedule_loop kernel/sched/core.c:7347 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7362
schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2122
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2330
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 11881 Comm: syz.1.1511 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
RIP: 0010:rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline]
RIP: 0010:rcu_is_watching+0x18/0xb0 kernel/rcu/tree.c:753
Code: 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 53 65 48 ff 05 6f 11 e8 11 e8 0a b3 37 0a 89 c3 <83> f8 08 73 66 49 bf 00 00 00 00 00 fc ff df 4c 8d 34 dd d0 57 74
RSP: 0018:ffffc900055561d8 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000001 RCX: 0000000000000202
RDX: ffffc9000e819000 RSI: ffffffff8c6d9460 RDI: ffffffff8c6d9420
RBP: ffffc90005556350 R08: ffff8880796ac903 R09: 1ffff1100f2d5920
R10: dffffc0000000000 R11: ffffed100f2d5921 R12: ffff8880796ac880
R13: ffffffff8b824425 R14: ffffffff8ed5c6e0 R15: 0000000000000608
FS: 00007f2b985f66c0(0000) GS:ffff888124dda000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3381cff8 CR3: 0000000074b44000 CR4: 0000000000350ef0
Call Trace:
trace_lock_release include/trace/events/lock.h:68 [inline]
lock_release+0x4b/0x3c0 kernel/locking/lockdep.c:5920
rcu_lock_release include/linux/rcupdate.h:319 [inline]
rcu_read_unlock include/linux/rcupdate.h:880 [inline]
tipc_sk_lookup+0x812/0x920 net/tipc/socket.c:3008
tipc_sk_rcv+0x3f8/0x2b50 net/tipc/socket.c:2497
tipc_node_xmit+0x205/0xf10 net/tipc/node.c:1706
tipc_node_xmit_skb+0x11e/0x190 net/tipc/node.c:1771
tipc_sk_rcv+0x2931/0x2b50 net/tipc/socket.c:2527
tipc_node_xmit+0x205/0xf10 net/tipc/node.c:1706
tipc_sk_push_backlog net/tipc/socket.c:1314 [inline]
tipc_sk_filter_connect net/tipc/socket.c:2260 [inline]
tipc_sk_filter_rcv+0x17f3/0x3210 net/tipc/socket.c:2369
tipc_sk_enqueue net/tipc/socket.c:2450 [inline]
tipc_sk_rcv+0x877/0x2b50 net/tipc/socket.c:2502
tipc_node_xmit+0x205/0xf10 net/tipc/node.c:1706
tipc_node_xmit_skb net/tipc/node.c:1771 [inline]
tipc_node_distr_xmit+0x2cd/0x400 net/tipc/node.c:1786
tipc_sk_backlog_rcv+0x1ad/0x270 net/tipc/socket.c:2417
sk_backlog_rcv include/net/sock.h:1190 [inline]
__release_sock+0x28b/0x390 net/core/sock.c:3260
release_sock+0x190/0x260 net/core/sock.c:3859
tipc_release+0x1a9a/0x24d0 net/tipc/socket.c:652
__sock_release+0xa0/0x1f0 net/socket.c:735
sock_close+0x1c/0x30 net/socket.c:1526
__fput+0x418/0xa50 fs/file_table.c:512
task_work_run+0x1d9/0x270 kernel/task_work.c:233
get_signal+0x1181/0x12c0 kernel/signal.c:2811
arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
exit_to_user_mode_loop+0x10e/0x770 kernel/entry/common.c:101
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:336 [inline]
do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2b9a39e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2b985f6028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: 00000000000203a0 RBX: 00007f2b9a626090 RCX: 00007f2b9a39e159
RDX: 0000000000000000 RSI: 00002000000003c0 RDI: 0000000000000003
RBP: 00007f2b9a435024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2b9a626128 R14: 00007f2b9a626090 R15: 00007ffceab10a48