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rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-....: (1 GPs behind) idle=4644/1/0x4000000000000000 softirq=10831/10832 fqs=2100 rcu: hardirqs softirqs csw/system rcu: number: 16002427 0 0 rcu: cputime: 6324 46242 0 ==> 52550(ms) rcu: (detected by 0, t=10506 jiffies, g=9597, q=1217 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 6050 Comm: syz.2.56 Not tainted 6.6.102-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:check_preemption_disabled+0x18/0x110 lib/smp_processor_id.c:14 Code: a0 66 fc 8a eb 0c 66 2e 0f 1f 84 00 00 00 00 00 66 90 55 41 57 41 56 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 24 08 <65> 8b 05 8d 5c 96 75 65 8b 0d 82 5c 96 75 f7 c1 ff ff ff 7f 74 1f RSP: 0018:ffffc900001f01e8 EFLAGS: 00000086 RAX: 781cdb9b2f507700 RBX: 00000000b8f3d370 RCX: 0000000000000100 RDX: ffff888026d89e00 RSI: ffffffff8afc66a0 RDI: ffffffff8afc6660 RBP: 0000000000000001 R08: dffffc0000000000 R09: 1ffffffff21b46a0 R10: dffffc0000000000 R11: fffffbfff21b46a1 R12: dffffc0000000000 R13: dffffc0000000001 R14: ffffffff813c0bcc R15: ffff88813fff92e0 FS: 00007fb756fff6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000100000000 CR3: 000000001b7ab000 CR4: 00000000003506e0 Call Trace: <IRQ> rcu_dynticks_curr_cpu_in_eqs include/linux/context_tracking.h:122 [inline] rcu_is_watching+0x15/0xb0 kernel/rcu/tree.c:700 rcu_read_lock_sched include/linux/rcupdate.h:879 [inline] pfn_valid include/linux/mmzone.h:2011 [inline] __virt_addr_valid+0x1c6/0x540 arch/x86/mm/physaddr.c:65 kasan_addr_to_slab+0xd/0xd0 mm/kasan/common.c:35 __kasan_record_aux_stack+0xf/0xc0 mm/kasan/generic.c:477 irq_work_queue_on+0xf5/0x220 kernel/irq_work.c:150 rcu_read_unlock_special+0x3a7/0x4c0 kernel/rcu/tree_plugin.h:675 __rcu_read_unlock+0x7c/0xd0 kernel/rcu/tree_plugin.h:426 rcu_read_unlock include/linux/rcupdate.h:818 [inline] __perf_event_output kernel/events/core.c:7983 [inline] perf_event_output_forward+0x2e6/0x3a0 kernel/events/core.c:7992 __perf_event_overflow+0x447/0x630 kernel/events/core.c:9717 perf_swevent_overflow kernel/events/core.c:9793 [inline] perf_swevent_event+0x2f5/0x5c0 kernel/events/core.c:-1 perf_tp_event+0x4f9/0x13a0 kernel/events/core.c:10343 perf_trace_run_bpf_submit+0xf4/0x1c0 kernel/events/core.c:10267 perf_trace_preemptirq_template+0x281/0x340 include/trace/events/preemptirq.h:14 trace_irq_enable+0xbf/0xe0 include/trace/events/preemptirq.h:40 trace_hardirqs_on+0x18/0x40 kernel/trace/trace_preemptirq.c:56 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:723 RIP: 0010:rcu_read_unlock_special+0x88/0x4c0 kernel/rcu/tree_plugin.h:682 Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 39 58 93 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b RSP: 0018:ffffc900001f0b00 EFLAGS: 00000206 RAX: 781cdb9b2f507700 RBX: 1ffff9200003e168 RCX: 781cdb9b2f507700 RDX: dffffc0000000000 RSI: ffffffff8aaab9c0 RDI: ffffffff8afc66c0 RBP: ffffc900001f0bf0 R08: ffffffff90da353f R09: 1ffffffff21b46a7 R10: dffffc0000000000 R11: fffffbfff21b46a8 R12: ffffffff8cd35400 R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000002 __rcu_read_unlock+0x7c/0xd0 kernel/rcu/tree_plugin.h:426 rcu_read_unlock include/linux/rcupdate.h:818 [inline] ieee80211_iterate_active_interfaces_atomic+0x15a/0x180 net/mac80211/util.c:804 mac80211_hwsim_beacon+0xbb/0x1b0 drivers/net/wireless/virtual/mac80211_hwsim.c:2295 __run_hrtimer kernel/time/hrtimer.c:1755 [inline] __hrtimer_run_queues+0x51e/0xc40 kernel/time/hrtimer.c:1819 hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1836 handle_softirqs+0x280/0x820 kernel/softirq.c:578 __do_softirq kernel/softirq.c:612 [inline] invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:preempt_schedule_irq+0xb0/0x140 kernel/sched/core.c:7009 Code: 44 24 20 f6 44 24 21 02 74 0b 0f 0b 48 f7 03 08 00 00 00 74 63 bf 01 00 00 00 e8 4b da e5 f6 e8 46 5f 16 f7 fb bf 01 00 00 00 <e8> db b5 ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24 RSP: 0018:ffffc9000b777580 EFLAGS: 00000282 RAX: 781cdb9b2f507700 RBX: 0000000000000000 RCX: 781cdb9b2f507700 RDX: dffffc0000000000 RSI: ffffffff8aaab9c0 RDI: 0000000000000001 RBP: ffffc9000b777630 R08: ffffffff90da353f R09: 1ffffffff21b46a7 R10: dffffc0000000000 R11: fffffbfff21b46a8 R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920016eeeb0 irqentry_exit+0x67/0x70 kernel/entry/common.c:438 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:kernel_text_address+0xa3/0xd0 kernel/extable.c:129 Code: 17 00 41 89 c6 84 c0 75 05 e8 89 dc 14 09 48 89 df e8 d1 65 1a 00 bd 01 00 00 00 84 c0 75 0b 48 89 df e8 00 40 3a 00 0f b6 e8 <45> 84 f6 75 89 e8 53 da 14 09 eb 82 48 c7 c1 c0 57 4a 8e 80 e1 07 RSP: 0018:ffffc9000b7776f0 EFLAGS: 00000286 RAX: 0000000000000000 RBX: 00007fb75618ebe9 RCX: 781cdb9b2f507700 RDX: 0000000000000001 RSI: ffffffff8aaacb40 RDI: ffffffff8afc66c0 RBP: 0000000000000000 R08: ffffffff8e4a882f R09: 1ffffffff1c95105 R10: dffffc0000000000 R11: fffffbfff1c95106 R12: ffffffff8a8000d0 R13: 0000000000000000 R14: 0000000000000001 R15: 1ffff920016eeef2 __kernel_text_address+0xd/0x30 kernel/extable.c:79 unwind_get_return_address+0x5d/0xc0 arch/x86/kernel/unwind_orc.c:369 arch_stack_walk+0x11d/0x190 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:198 [inline] __do_kmalloc_node mm/slab_common.c:1007 [inline] __kmalloc+0xb4/0x240 mm/slab_common.c:1020 kmalloc include/linux/slab.h:604 [inline] kzalloc include/linux/slab.h:721 [inline] tomoyo_encode2 security/tomoyo/realpath.c:45 [inline] tomoyo_encode+0x28b/0x540 security/tomoyo/realpath.c:80 tomoyo_realpath_from_path+0x592/0x5d0 security/tomoyo/realpath.c:283 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_number_perm+0x1ea/0x590 security/tomoyo/file.c:723 security_file_ioctl+0x70/0xa0 security/security.c:2647 __do_sys_ioctl fs/ioctl.c:865 [inline] __se_sys_ioctl+0x48/0x170 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fb75618ebe9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb756fff038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fb7563b5fa0 RCX: 00007fb75618ebe9 RDX: ffffffffffffffff RSI: 0000000040042408 RDI: 0000000000000005 RBP: 00007fb756211e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fb7563b6038 R14: 00007fb7563b5fa0 R15: 00007ffcb1af0258 </TASK>
| Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025/08/21 08:00 | linux-6.6.y | bb9c90ab9c5a | 0b9605c8 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-linux-6-6-kasan-perf | INFO: rcu detected stall in security_file_ioctl |