rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6176/1:b..l.. P6190/1:b..l..
rcu: (detected by 1, t=10502 jiffies, g=19977, q=1290 ncpus=2)
task:udevd state:R running task stack:26960 pid:6190 tgid:6190 ppid:4986 task_flags:0x400140 flags:0x00080800
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x125e/0x6990 kernel/sched/core.c:7382
preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:7662
irqentry_exit_cond_resched arch/x86/include/asm/fred.h:105 [inline]
irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:453 [inline]
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:543 [inline]
irqentry_exit+0x33f/0xab0 kernel/entry/common.c:154
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__read_once_word_nocheck+0x3/0x10 include/asm-generic/rwonce.h:68
Code: ff ff 48 c7 c7 18 e4 0b 8c e8 49 1c cc 00 e9 1e fa ff ff 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 8b 07 c8 69 2f 0a 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc900032cf8d8 EFLAGS: 00000202
RAX: ffffffff8286fef0 RBX: 0000000000000001 RCX: ffffffff93121f66
RDX: ffffc900032cfa01 RSI: ffffc900032cfa78 RDI: ffffc900032cfa78
RBP: ffffc900032cf998 R08: ffffffff93121f6a R09: 0000000000000007
R10: 0000000000000200 R11: 000000000000f7e1 R12: ffffc900032cf9a0
R13: ffffc900032cf950 R14: ffffc900032cfa80 R15: ffffc900032cf984
deref_stack_reg arch/x86/kernel/unwind_orc.c:422 [inline]
unwind_next_frame+0xd07/0x2090 arch/x86/kernel/unwind_orc.c:614
arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
unpoison_slab_object mm/kasan/common.c:351 [inline]
__kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:377
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4720 [inline]
slab_alloc_node mm/slub.c:5033 [inline]
kmem_cache_alloc_noprof+0x269/0x6a0 mm/slub.c:5047
alloc_filename fs/namei.c:147 [inline]
do_getname+0x35/0x390 fs/namei.c:187
class_filename_flags_constructor include/linux/fs.h:2591 [inline]
do_sys_openat2+0xc3/0x1d0 fs/open.c:1441
do_sys_open fs/open.c:1448 [inline]
__do_sys_openat fs/open.c:1464 [inline]
__se_sys_openat fs/open.c:1459 [inline]
__x64_sys_openat+0x12d/0x210 fs/open.c:1459
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9896de3407
RSP: 002b:00007fff6178aeb0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f9896d57880 RCX: 00007f9896de3407
RDX: 0000000000080000 RSI: 000056534466a480 RDI: ffffffffffffff9c
RBP: 000056534466a480 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000009
task:syz-executor state:R running task stack:23128 pid:6176 tgid:6176 ppid:6167 task_flags:0x400140 flags:0x00080001
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x125e/0x6990 kernel/sched/core.c:7382
preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:7662
irqentry_exit_cond_resched arch/x86/include/asm/fred.h:105 [inline]
irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:453 [inline]
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:543 [inline]
irqentry_exit+0x33f/0xab0 kernel/entry/common.c:154
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:231 [inline]
RIP: 0010:unwind_next_frame+0x297/0x2090 arch/x86/kernel/unwind_orc.c:510
Code: 29 48 89 54 24 30 89 4c 24 28 89 74 24 20 44 89 5c 24 18 e8 7b 11 cc 00 48 8b 54 24 30 8b 4c 24 28 8b 74 24 20 44 8b 5c 24 18 <89> cf 8b 14 95 88 9f ce 93 48 8d 04 7f 48 8d 84 00 58 39 03 93 83
RSP: 0018:ffffc9000301ede8 EFLAGS: 00000246
RAX: 0000000000000007 RBX: 0000000000000001 RCX: 00000000001b7ea0
RDX: 000000000008f3a1 RSI: 00000000000aeb6d RDI: ffffffff93f26e0c
RBP: ffffc9000301eea0 R08: 0000000000000000 R09: 0000000000000007
R10: 0000000000000200 R11: 000000000008f3a0 R12: ffffc9000301eea8
R13: ffffc9000301ee58 R14: ffffc9000301ee8d R15: ffffffff89f3a067
arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
unpoison_slab_object mm/kasan/common.c:351 [inline]
__kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:377
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4720 [inline]
slab_alloc_node mm/slub.c:5033 [inline]
kmem_cache_alloc_lru_noprof+0x265/0x6a0 mm/slub.c:5066
alloc_inode+0x68/0x250 fs/inode.c:338
new_inode+0x22/0x1c0 fs/inode.c:1170
debugfs_get_inode fs/debugfs/inode.c:72 [inline]
__debugfs_create_file+0xfb/0x500 fs/debugfs/inode.c:436
debugfs_create_file_full+0x41/0x60 fs/debugfs/inode.c:463
rate_control_add_debugfs net/mac80211/rate.h:83 [inline]
ieee80211_register_hw+0x3294/0x45c0 net/mac80211/main.c:1639
mac80211_hwsim_new_radio+0x2b01/0x66f0 drivers/net/wireless/virtual/mac80211_hwsim_main.c:6186
hwsim_new_radio_nl+0xc6b/0x13f0 drivers/net/wireless/virtual/mac80211_hwsim_main.c:7062
genl_family_rcv_msg_doit+0x214/0x300 net/netlink/genetlink.c:1114
genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
genl_rcv_msg+0x560/0x800 net/netlink/genetlink.c:1209
netlink_rcv_skb+0x159/0x420 net/netlink/af_netlink.c:2576
genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218
netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
netlink_unicast+0x668/0x950 net/netlink/af_netlink.c:1361
netlink_sendmsg+0x9ac/0x10c0 net/netlink/af_netlink.c:1920
sock_sendmsg_nosec net/socket.c:800 [inline]
__sock_sendmsg net/socket.c:818 [inline]
__sys_sendto+0x492/0x4e0 net/socket.c:2283
__do_sys_sendto net/socket.c:2290 [inline]
__se_sys_sendto net/socket.c:2286 [inline]
__x64_sys_sendto+0xe0/0x1c0 net/socket.c:2286
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f446095ac0e
RSP: 002b:00007ffd334d5508 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 000055558f658500 RCX: 00007f446095ac0e
RDX: 0000000000000024 RSI: 00007f4461704670 RDI: 0000000000000003
RBP: 0000000000000001 R08: 00007ffd334d5584 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f4461704670 R15: 0000000000000000
rcu: rcu_preempt kthread starved for 10591 jiffies! g19977 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->cpu=0
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:27544 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x125e/0x6990 kernel/sched/core.c:7382
preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:7662
irqentry_exit_cond_resched arch/x86/include/asm/fred.h:105 [inline]
irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:453 [inline]
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:543 [inline]
irqentry_exit+0x33f/0xab0 kernel/entry/common.c:154
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:preempt_count_sub+0x60/0x150 kernel/sched/core.c:6100
Code: 0d 65 74 ec 1a 85 c9 75 14 65 48 8b 05 c1 fe de 13 39 d8 72 1b 81 fb fe 00 00 00 76 6f f7 db 48 63 db 65 48 01 1d a8 fe de 13 <5b> e9 da 39 12 0a 90 e8 d4 20 59 03 85 c0 74 4b 48 c7 c0 20 64 69
RSP: 0018:ffffc90000157b80 EFLAGS: 00000257
RAX: 0000000000000001 RBX: ffffffffffffffff RCX: 0000000000000000
RDX: 0000000000000004 RSI: ffffffff8c831600 RDI: 0000000000000001
RBP: ffffed1003fd0000 R08: 0000000000000000 R09: fffffbfff24d268b
R10: ffffffff9269345f R11: 0000000000000000 R12: ffff88801fe8002c
R13: 1ffffffff1f81e50 R14: ffff88801fe80000 R15: dffffc0000000000
__schedule_loop kernel/sched/core.c:7460 [inline]
schedule+0xe7/0x2c0 kernel/sched/core.c:7474
schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1a9/0x930 kernel/rcu/tree.c:2122
rcu_gp_kthread+0x179/0x260 kernel/rcu/tree.c:2330
kthread+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6556 Comm: syz.1.58 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:206
Code: 46 e5 66 00 48 89 df 5b e9 ad cf 6c 00 be 03 00 00 00 5b e9 c2 a8 26 03 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 65 48 8b 05 0c 25 a9 13 48 8b 34 24 65 48 8b 15 f0 24
RSP: 0018:ffffc90003c6fac8 EFLAGS: 00000012
RAX: 0000000000000000 RBX: 000000354611a722 RCX: ffffffff81f957df
RDX: 0000000000000002 RSI: 0000003546238680 RDI: ffff88807e954b00
RBP: ffff888079f5c118 R08: 0000000000000006 R09: 0000003546238680
R10: 000000354611a722 R11: 0000000000000001 R12: 0000003546238680
R13: 0000000000000001 R14: ffff8880b8028840 R15: ffffffff95b7c840
FS: 00007f6d20efe6c0(0000) GS:ffff8881224ac000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000058 CR3: 000000002dcee000 CR4: 00000000003526f0
Call Trace:
hrtimer_reprogram+0x2ed/0x6c0 kernel/time/hrtimer.c:898
hrtimer_start_range_ns_user+0x3ee/0x720 kernel/time/hrtimer.c:1616
__posixtimer_deliver_signal kernel/time/posix-timers.c:317 [inline]
posixtimer_deliver_signal+0x2e6/0x6e0 kernel/time/posix-timers.c:348
dequeue_signal+0x402/0x500 kernel/signal.c:666
get_signal+0x534/0x21d0 kernel/signal.c:2992
arch_do_signal_or_restart+0x91/0x7e0 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
exit_to_user_mode_loop+0x139/0x700 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:343 [inline]
do_syscall_64+0x661/0x790 arch/x86/entry/syscall_64.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6d1ff9a339
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:00007f6d20efe0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f6d201d5fa8 RCX: 00007f6d1ff9a339
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f6d201d5fa8
RBP: 00007f6d201d5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6d201d6038 R14: 00007ffeee887720 R15: 00007ffeee887808