watchdog: BUG: soft lockup - CPU#1 stuck for 144s! [syz.3.71:6188] Modules linked in: irq event stamp: 13373145 hardirqs last enabled at (13373144): [] irqentry_exit+0x59e/0x620 kernel/entry/common.c:242 hardirqs last disabled at (13373145): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (13241896): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (13241896): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (13241896): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (13241905): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (13241905): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (13241905): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 6188 Comm: syz.3.71 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:100 [inline] RIP: 0010:memory_is_nonzero mm/kasan/generic.c:115 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:140 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:172 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:191 [inline] RIP: 0010:kasan_check_range+0x9d/0x2c0 mm/kasan/generic.c:200 Code: 34 19 4d 89 f4 4d 29 dc 49 83 fc 10 7f 29 4d 85 e4 0f 84 3d 01 00 00 4c 89 cb 48 f7 d3 4c 01 fb 41 80 3b 00 0f 85 9e 01 00 00 <49> ff c3 48 ff c3 75 ee e9 1d 01 00 00 44 89 dd 83 e5 07 0f 84 b5 RSP: 0018:ffffc90000a083e8 EFLAGS: 00000246 RAX: 0000000000000001 RBX: ffffffffffffffff RCX: ffffffff81cfc5cf RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffe8ffffdb6024 RBP: 0000000000000000 R08: ffffe8ffffdb602b R09: 1ffffd1ffffb6c05 R10: dffffc0000000000 R11: fffff91ffffb6c05 R12: 0000000000000002 R13: dffffc0000000000 R14: fffff91ffffb6c06 R15: 1ffffd1ffffb6c04 FS: 00007f8d447046c0(0000) GS:ffff888125551000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30a05ff8 CR3: 0000000034caa000 CR4: 00000000003526f0 Call Trace: __asan_memset+0x22/0x50 mm/kasan/shadow.c:84 perf_trace_buf_alloc+0x1bf/0x280 kernel/trace/trace_event_perf.c:419 do_perf_trace_lock include/trace/events/lock.h:50 [inline] perf_trace_lock+0x1a0/0x410 include/trace/events/lock.h:50 __do_trace_lock_release include/trace/events/lock.h:69 [inline] trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0x392/0x3d0 kernel/locking/lockdep.c:5879 rcu_lock_release include/linux/rcupdate.h:319 [inline] rcu_read_unlock include/linux/rcupdate.h:878 [inline] class_rcu_destructor include/linux/rcupdate.h:1190 [inline] unwind_next_frame+0x1aaa/0x23c0 arch/x86/kernel/unwind_orc.c:695 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:340 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4538 [inline] slab_alloc_node mm/slub.c:4866 [inline] kmem_cache_alloc_node_noprof+0x384/0x690 mm/slub.c:4918 kmalloc_reserve net/core/skbuff.c:613 [inline] __alloc_skb+0x27d/0x7d0 net/core/skbuff.c:713 alloc_skb include/linux/skbuff.h:1383 [inline] ndisc_alloc_skb+0x9f/0x480 net/ipv6/ndisc.c:420 ndisc_send_rs+0x2b5/0x630 net/ipv6/ndisc.c:706 addrconf_rs_timer+0x395/0x6d0 net/ipv6/addrconf.c:4041 call_timer_fn+0x192/0x640 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2373 [inline] __run_timer_base+0x652/0x8b0 kernel/time/timer.c:2385 run_timer_base kernel/time/timer.c:2394 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2404 handle_softirqs+0x22a/0x870 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x17/0x70 kernel/kcov.c:217 Code: cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 65 48 8b 0d 38 1c 57 11 65 8b 15 59 1c 57 11 <81> e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 a4 16 00 00 RSP: 0018:ffffc90004c8f168 EFLAGS: 00000287 RAX: ffffffff81f9205b RBX: 000000000000002c RCX: ffff88801d775b80 RDX: 0000000000000002 RSI: 000000000000002c RDI: 0000000000002000 RBP: ffffc90004c8f2e0 R08: ffffc90004c8fe78 R09: 0000000000000000 R10: ffffc90004c8f478 R11: fffff52000991e91 R12: dffffc0000000000 R13: dffffc0000000000 R14: ffffc90004c8f240 R15: dffffc0000000000 perf_swevent_get_recursion_context+0x1b/0x100 kernel/events/core.c:11014 perf_trace_buf_alloc+0x43/0x280 kernel/trace/trace_event_perf.c:410 do_perf_trace_lock include/trace/events/lock.h:50 [inline] perf_trace_lock+0x1a0/0x410 include/trace/events/lock.h:50 __do_trace_lock_release include/trace/events/lock.h:69 [inline] trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0x392/0x3d0 kernel/locking/lockdep.c:5879 rcu_lock_release include/linux/rcupdate.h:319 [inline] rcu_read_unlock include/linux/rcupdate.h:878 [inline] class_rcu_destructor include/linux/rcupdate.h:1190 [inline] unwind_next_frame+0x1aaa/0x23c0 arch/x86/kernel/unwind_orc.c:695 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556 __call_rcu_common kernel/rcu/tree.c:3131 [inline] call_rcu+0xee/0x890 kernel/rcu/tree.c:3251 context_switch kernel/sched/core.c:5301 [inline] __schedule+0x15e5/0x52d0 kernel/sched/core.c:6911 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7238 irqentry_exit+0x599/0x620 kernel/entry/common.c:239 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:check_kcov_mode kernel/kcov.c:185 [inline] RIP: 0010:write_comp_data kernel/kcov.c:246 [inline] RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x30/0x90 kernel/kcov.c:314 Code: 04 24 65 48 8b 15 f8 17 57 11 65 8b 0d 19 18 57 11 81 e1 00 01 ff 00 74 11 81 f9 00 01 00 00 75 5b 83 ba a4 16 00 00 00 74 52 <8b> 8a 80 16 00 00 83 f9 03 75 47 48 8b 8a 88 16 00 00 44 8b 8a 84 RSP: 0018:ffffc90004c8fb70 EFLAGS: 00000246 RAX: ffffffff8245959d RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff88801d775b80 RSI: 0000000000000017 RDI: 0000000000000008 RBP: 0000000000000000 R08: ffff88801d775b80 R09: 0000000000000002 R10: 000000000000005c R11: 0000000000000000 R12: 0000000000000017 R13: 0000000000000017 R14: 6f6e695f6e6f6e61 R15: ffff8880286be200 full_name_hash+0x4d/0xe0 fs/namei.c:2401 tomoyo_fill_path_info+0x30f/0x3c0 security/tomoyo/util.c:685 tomoyo_get_realpath security/tomoyo/file.c:153 [inline] tomoyo_path_number_perm+0x264/0x630 security/tomoyo/file.c:728 security_file_ioctl+0xc3/0x2a0 security/security.c:2436 __do_sys_ioctl fs/ioctl.c:591 [inline] __se_sys_ioctl+0x47/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8d4379c819 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:00007f8d44704028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f8d43a15fa0 RCX: 00007f8d4379c819 RDX: 0000200000000000 RSI: 0000000040082406 RDI: 0000000000000007 RBP: 00007f8d43832c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8d43a16038 R14: 00007f8d43a15fa0 R15: 00007fffbd237018 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 5195 Comm: udevd Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:rcu_segcblist_ready_cbs+0x2a/0x80 kernel/rcu/rcu_segcblist.c:269 Code: 0f 1f 40 d6 41 57 41 56 53 49 be 00 00 00 00 00 fc ff df 48 8d 5f 70 48 89 d8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 3b f6 03 01 <75> 04 31 c0 eb 27 48 8d 47 08 48 89 c1 48 c1 e9 03 42 80 3c 31 00 RSP: 0018:ffffc90000007ba0 EFLAGS: 00000002 RAX: 0000000000000000 RBX: ffff8880b863bed8 RCX: 0000000080010001 RDX: 0000000000000000 RSI: ffffffff8bce4300 RDI: ffff8880b863be68 RBP: 0000000000000000 R08: ffffffff9011e0b7 R09: 1ffffffff2023c16 R10: dffffc0000000000 R11: fffffbfff2023c17 R12: ffff8880b863bdc0 R13: ffff8880b863bdd2 R14: dffffc0000000000 R15: 0000000000002c4d FS: 00007f5380e79880(0000) GS:ffff888125451000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000559ce5019168 CR3: 0000000079f12000 CR4: 00000000003526f0 Call Trace: rcu_pending kernel/rcu/tree.c:3700 [inline] rcu_sched_clock_irq+0x63e/0x1050 kernel/rcu/tree.c:2716 update_process_times+0x23b/0x2f0 kernel/time/timer.c:2474 tick_sched_handle kernel/time/tick-sched.c:298 [inline] tick_nohz_handler+0x42b/0x770 kernel/time/tick-sched.c:319 __run_hrtimer kernel/time/hrtimer.c:1785 [inline] __hrtimer_run_queues+0x4e7/0xcc0 kernel/time/hrtimer.c:1849 hrtimer_interrupt+0x447/0x1050 kernel/time/hrtimer.c:1912 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline] __sysvec_apic_timer_interrupt+0x102/0x460 arch/x86/kernel/apic/apic.c:1062 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2039 [inline] RIP: 0010:vprintk_emit+0x45d/0x560 kernel/printk/printk.c:2478 Code: 0f 84 44 ff ff ff e8 92 43 21 00 fb eb 44 e8 8a 43 21 00 e8 55 b2 0b 0a 4d 85 f6 74 94 e8 7b 43 21 00 fb 48 c7 c7 00 0a 75 8e <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 6b 16 RSP: 0018:ffffc900025ef8a0 EFLAGS: 00000293 RAX: ffffffff81a49045 RBX: ffffffff81a48ebf RCX: ffff888079995b80 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8e750a00 RBP: ffffc900025ef950 R08: ffffffff9011e0b7 R09: 1ffffffff2023c16 R10: dffffc0000000000 R11: fffffbfff2023c17 R12: 0000000000000000 R13: 000000000000004d R14: 0000000000000200 R15: 1ffff920004bdf18 devkmsg_emit+0xe4/0x140 kernel/printk/printk.c:733 devkmsg_write+0x31c/0x400 kernel/printk/printk.c:796 do_iter_readv_writev+0x619/0x8c0 fs/read_write.c:-1 vfs_writev+0x33c/0x990 fs/read_write.c:1059 do_writev+0x154/0x2e0 fs/read_write.c:1105 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f53806a7407 Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007ffd31bda3e0 EFLAGS: 00000202 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 00007f5380e79880 RCX: 00007f53806a7407 RDX: 0000000000000005 RSI: 00007ffd31bda4a0 RDI: 0000000000000005 RBP: 00007ffd31bda5d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffd31bda4a0 R13: 00007ffd31bda530 R14: 0000000000000000 R15: 00007ffd31bda510