rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (1 ticks this GP) idle=3dd/1/0x4000000000000002 softirq=7858/7858 fqs=0 (detected by 1, t=10502 jiffies, g=9461, q=2264) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4240 Comm: syz-executor.2 Not tainted 5.15.137-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:193 Code: 1f 84 00 00 00 00 00 0f 1f 00 53 48 89 fb e8 17 00 00 00 48 8b 3d 18 6f 63 0c 48 89 de 5b e9 57 de 48 00 cc cc cc cc cc cc cc <48> 8b 04 24 65 48 8b 0d 64 4d 82 7e 65 8b 15 65 4d 82 7e f7 c2 00 RSP: 0018:ffffc90000007230 EFLAGS: 00000083 RAX: 0000000000000002 RBX: ffffc900000072e0 RCX: 0000000000000000 RDX: 0000000000000018 RSI: 0000000000000000 RDI: ffffc900000072f8 RBP: ffffc90000007370 R08: dffffc0000000000 R09: ffffc900000072e0 R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff92000000e58 R13: dffffc0000000000 R14: 0000000000000008 R15: ffff88801d22c680 FS: 00007f20873b56c0(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020030000 CR3: 0000000064a00000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:268 rcu_read_lock include/linux/rcupdate.h:696 [inline] __perf_output_begin kernel/events/ring_buffer.c:163 [inline] perf_output_begin_forward+0xb0/0xa80 kernel/events/ring_buffer.c:268 __perf_event_output kernel/events/core.c:7679 [inline] perf_event_output_forward+0x1c8/0x310 kernel/events/core.c:7697 __perf_event_overflow+0x35d/0x530 kernel/events/core.c:9392 perf_tp_event+0x363/0xc40 kernel/events/core.c:9924 perf_trace_run_bpf_submit+0xf7/0x1d0 kernel/events/core.c:9898 perf_trace_preemptirq_template+0x31d/0x430 include/trace/events/preemptirq.h:14 trace_irq_enable_rcuidle+0x10e/0x190 include/trace/events/preemptirq.h:40 trace_hardirqs_on+0x57/0x80 kernel/trace/trace_preemptirq.c:44 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:664 RIP: 0010:rcu_read_unlock_special+0x84/0x520 kernel/rcu/tree_plugin.h:671 Code: f1 f1 f1 00 f2 f2 f2 49 89 04 17 66 41 c7 44 17 09 f3 f3 41 c6 44 17 0b f3 65 44 8b 25 dd ce 96 7e 41 f7 c4 00 00 f0 00 74 45 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 3a 00 00 00 00 66 42 c7 44 3a RSP: 0018:ffffc900000079e0 EFLAGS: 00000206 RAX: f2bb4ad1039b2100 RBX: 1ffff92000000f44 RCX: ffffffff8162ea18 RDX: dffffc0000000000 RSI: ffffffff8a8b0be0 RDI: ffffffff8ad87b40 RBP: ffffc90000007ab8 R08: dffffc0000000000 R09: fffffbfff1f79a3f R10: 0000000000000000 R11: dffffc0000000001 R12: ffffffff8c923000 R13: ffff888025695d98 R14: ffffc90000007a20 R15: 1ffff92000000f40 __rcu_read_unlock+0x92/0x100 kernel/rcu/tree_plugin.h:422 rcu_read_unlock include/linux/rcupdate.h:728 [inline] hsr_announce+0x2a9/0x300 net/hsr/hsr_device.c:387 call_timer_fn+0x16d/0x560 kernel/time/timer.c:1421 expire_timers kernel/time/timer.c:1466 [inline] __run_timers+0x67c/0x890 kernel/time/timer.c:1737 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1750 __do_softirq+0x3b3/0x93a kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x155/0x240 kernel/softirq.c:637 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649 sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:kasan_quarantine_put+0x84/0x220 mm/kasan/quarantine.c:234 Code: e8 21 c4 bc ff 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 0f 85 83 00 00 00 41 f7 c7 00 02 00 00 74 01 fb 31 c0 <48> 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f c3 48 8d 80 40 56 03 00 45 RSP: 0018:ffffc9000475f908 EFLAGS: 00000206 RAX: f2bb4ad1039b2101 RBX: ffff88807374c000 RCX: ffffffff8162ea18 RDX: dffffc0000000000 RSI: ffffffff8a8b0be0 RDI: ffffffff8ad87b40 RBP: ffffc9000475f9a0 R08: dffffc0000000000 R09: fffffbfff1f79a41 R10: 0000000000000000 R11: dffffc0000000001 R12: ffffc9000475f998 R13: ffff888011c42140 R14: 00000000000b3630 R15: 0000000000000286 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1705 [inline] slab_free_freelist_hook+0xdd/0x160 mm/slub.c:1731 slab_free mm/slub.c:3499 [inline] kfree+0xf1/0x270 mm/slub.c:4559 tomoyo_realpath_from_path+0x5ad/0x5e0 security/tomoyo/realpath.c:291 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_number_perm+0x225/0x810 security/tomoyo/file.c:723 tomoyo_path_mkdir+0xe3/0x120 security/tomoyo/tomoyo.c:166 security_path_mkdir+0xdc/0x130 security/security.c:1155 do_mkdirat+0x19f/0x520 fs/namei.c:4014 __do_sys_mkdirat fs/namei.c:4034 [inline] __se_sys_mkdirat fs/namei.c:4032 [inline] __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4032 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f2088e33ae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f20873b50c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f2088f52f80 RCX: 00007f2088e33ae9 RDX: 00000000000001ff RSI: 0000000020000000 RDI: ffffffffffffff9c RBP: 00007f2088e7f47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f2088f52f80 R15: 00007ffc2be08c48 rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g9461 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=0 timer-softirq=4856 rcu: rcu_preempt kthread starved for 10502 jiffies! g9461 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27000 pid: 15 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5026 [inline] __schedule+0x12c4/0x45b0 kernel/sched/core.c:6372 schedule+0x11b/0x1f0 kernel/sched/core.c:6455 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1884 rcu_gp_fqs_loop+0x2af/0xf70 kernel/rcu/tree.c:1959 rcu_gp_kthread+0xa4/0x360 kernel/rcu/tree.c:2132 kthread+0x3f6/0x4f0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4240 Comm: syz-executor.2 Not tainted 5.15.137-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline] RIP: 0010:write_comp_data kernel/kcov.c:217 [inline] RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x4/0x80 kernel/kcov.c:291 Code: 89 f8 89 f6 48 c7 44 0a 08 05 00 00 00 48 89 44 0a 10 48 89 74 0a 18 4c 89 44 0a 20 49 ff c1 4c 89 09 c3 0f 1f 00 4c 8b 04 24 <65> 48 8b 0d 84 49 82 7e 65 8b 05 85 49 82 7e a9 00 01 ff 00 74 10 RSP: 0018:ffffc900000074a0 EFLAGS: 00000046 RAX: 1ffff11003a458ee RBX: 0000000000000000 RCX: dffffc0000000000 RDX: 0000000000000101 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000100 R08: ffffffff81a1bdc6 R09: ffffed1004ad2b29 R10: 0000000000000000 R11: dffffc0000000001 R12: ffffc90000007580 R13: ffff88801d22c680 R14: 0000000000000001 R15: ffff8880b9a34568 FS: 00007f20873b56c0(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020030000 CR3: 0000000064a00000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: perf_swevent_event+0xa6/0x550 kernel/events/core.c:9494 perf_tp_event+0x363/0xc40 kernel/events/core.c:9924 perf_trace_run_bpf_submit+0xf7/0x1d0 kernel/events/core.c:9898 perf_trace_preemptirq_template+0x31d/0x430 include/trace/events/preemptirq.h:14 trace_irq_enable_rcuidle+0x10e/0x190 include/trace/events/preemptirq.h:40 trace_hardirqs_on+0x57/0x80 kernel/trace/trace_preemptirq.c:44 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:664 RIP: 0010:rcu_read_unlock_special+0x84/0x520 kernel/rcu/tree_plugin.h:671 Code: f1 f1 f1 00 f2 f2 f2 49 89 04 17 66 41 c7 44 17 09 f3 f3 41 c6 44 17 0b f3 65 44 8b 25 dd ce 96 7e 41 f7 c4 00 00 f0 00 74 45 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 3a 00 00 00 00 66 42 c7 44 3a RSP: 0018:ffffc900000079e0 EFLAGS: 00000206 RAX: f2bb4ad1039b2100 RBX: 1ffff92000000f44 RCX: ffffffff8162ea18 RDX: dffffc0000000000 RSI: ffffffff8a8b0be0 RDI: ffffffff8ad87b40 RBP: ffffc90000007ab8 R08: dffffc0000000000 R09: fffffbfff1f79a3f R10: 0000000000000000 R11: dffffc0000000001 R12: ffffffff8c923000 R13: ffff888025695d98 R14: ffffc90000007a20 R15: 1ffff92000000f40 __rcu_read_unlock+0x92/0x100 kernel/rcu/tree_plugin.h:422 rcu_read_unlock include/linux/rcupdate.h:728 [inline] hsr_announce+0x2a9/0x300 net/hsr/hsr_device.c:387 call_timer_fn+0x16d/0x560 kernel/time/timer.c:1421 expire_timers kernel/time/timer.c:1466 [inline] __run_timers+0x67c/0x890 kernel/time/timer.c:1737 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1750 __do_softirq+0x3b3/0x93a kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x155/0x240 kernel/softirq.c:637 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649 sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:kasan_quarantine_put+0x84/0x220 mm/kasan/quarantine.c:234 Code: e8 21 c4 bc ff 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 0f 85 83 00 00 00 41 f7 c7 00 02 00 00 74 01 fb 31 c0 <48> 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f c3 48 8d 80 40 56 03 00 45 RSP: 0018:ffffc9000475f908 EFLAGS: 00000206 RAX: f2bb4ad1039b2101 RBX: ffff88807374c000 RCX: ffffffff8162ea18 RDX: dffffc0000000000 RSI: ffffffff8a8b0be0 RDI: ffffffff8ad87b40 RBP: ffffc9000475f9a0 R08: dffffc0000000000 R09: fffffbfff1f79a41 R10: 0000000000000000 R11: dffffc0000000001 R12: ffffc9000475f998 R13: ffff888011c42140 R14: 00000000000b3630 R15: 0000000000000286 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1705 [inline] slab_free_freelist_hook+0xdd/0x160 mm/slub.c:1731 slab_free mm/slub.c:3499 [inline] kfree+0xf1/0x270 mm/slub.c:4559 tomoyo_realpath_from_path+0x5ad/0x5e0 security/tomoyo/realpath.c:291 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_number_perm+0x225/0x810 security/tomoyo/file.c:723 tomoyo_path_mkdir+0xe3/0x120 security/tomoyo/tomoyo.c:166 security_path_mkdir+0xdc/0x130 security/security.c:1155 do_mkdirat+0x19f/0x520 fs/namei.c:4014 __do_sys_mkdirat fs/namei.c:4034 [inline] __se_sys_mkdirat fs/namei.c:4032 [inline] __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4032 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f2088e33ae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f20873b50c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f2088f52f80 RCX: 00007f2088e33ae9 RDX: 00000000000001ff RSI: 0000000020000000 RDI: ffffffffffffff9c RBP: 00007f2088e7f47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f2088f52f80 R15: 00007ffc2be08c48