syzbot

watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [syz.4.3839:20061]
Modules linked in:
irq event stamp: 14760585
hardirqs last  enabled at (14760584): [<ffffffff8b494f9d>] irqentry_exit+0x5dd/0x660 kernel/entry/common.c:219
hardirqs last disabled at (14760585): [<ffffffff8b49380e>] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056
softirqs last  enabled at (14267218): [<ffffffff8185372a>] __do_softirq kernel/softirq.c:656 [inline]
softirqs last  enabled at (14267218): [<ffffffff8185372a>] invoke_softirq kernel/softirq.c:496 [inline]
softirqs last  enabled at (14267218): [<ffffffff8185372a>] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723
softirqs last disabled at (14267221): [<ffffffff8185372a>] __do_softirq kernel/softirq.c:656 [inline]
softirqs last disabled at (14267221): [<ffffffff8185372a>] invoke_softirq kernel/softirq.c:496 [inline]
softirqs last disabled at (14267221): [<ffffffff8185372a>] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723
CPU: 0 UID: 0 PID: 20061 Comm: syz.4.3839 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:ip6_rcv_core+0xbee/0x1590 net/ipv6/ip6_input.c:230
Code: bf ff 00 00 00 44 89 ee e8 8f a2 c9 f7 41 81 fd ff 00 00 00 0f 85 a7 00 00 00 4d 8d 6f 19 4c 89 e8 48 c1 e8 03 42 0f b6 04 30 <84> c0 0f 85 56 09 00 00 45 0f b6 6d 00 41 83 e5 0f bf 01 00 00 00
RSP: 0018:ffffc90000007938 EFLAGS: 00000a02
RAX: 0000000000000000 RBX: ffff8880322cab40 RCX: 0000000000000100
RDX: ffff88802c1f9e80 RSI: 00000000000000ff RDI: 00000000000000ff
RBP: 0000000000000002 R08: ffff8880322cab7f R09: 0000000000000000
R10: ffff8880322cab68 R11: ffffed1006459570 R12: ffff888057694000
R13: ffff88804ab253a9 R14: dffffc0000000000 R15: ffff88804ab25390
FS:  00007f9bd1c236c0(0000) GS:ffff8881260b0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002000 CR3: 0000000079b9e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000200000000300
DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 ipv6_rcv+0x72/0xc0 net/ipv6/ip6_input.c:308
 __netif_receive_skb_one_core net/core/dev.c:6137 [inline]
 __netif_receive_skb+0xd3/0x380 net/core/dev.c:6250
 process_backlog+0x622/0x1500 net/core/dev.c:6602
 __napi_poll+0xae/0x320 net/core/dev.c:7666
 napi_poll net/core/dev.c:7729 [inline]
 net_rx_action+0x672/0xe50 net/core/dev.c:7881
 handle_softirqs+0x27d/0x850 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xca/0x1f0 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
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:7190
Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 10 00 00 00 74 64 bf 01 00 00 00 e8 cb 4d 46 f6 e8 b6 93 7e f6 fb bf 01 00 00 00 <e8> 1b a8 ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc9000b55f820 EFLAGS: 00000282
RAX: 1a7b210bbf90fb00 RBX: 0000000000000000 RCX: 1a7b210bbf90fb00
RDX: 0000000000000006 RSI: ffffffff8d76bea1 RDI: 0000000000000001
RBP: ffffc9000b55f8d0 R08: ffffffff8f805b77 R09: 1ffffffff1f00b6e
R10: dffffc0000000000 R11: fffffbfff1f00b6f R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920016abf04
 irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:preempt_schedule+0x31/0xc0 kernel/sched/core.c:7064
Code: e5 41 56 53 48 83 e4 e0 48 83 ec 60 65 48 8b 05 35 90 2c 07 48 89 44 24 58 48 c7 04 24 b3 8a b5 41 48 c7 44 24 08 a7 7d 92 8d <48> c7 44 24 10 d0 6f 4a 8b 48 89 e3 48 c1 eb 03 48 b8 f1 f1 f1 f1
RSP: 0018:ffffc9000b55f9e0 EFLAGS: 00000282
RAX: 1a7b210bbf90fb00 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc9001091a000 RSI: 00000000000007ba RDI: 00000000000007bb
RBP: ffffc9000b55fa58 R08: ffffffff8f805b77 R09: 1ffffffff1f00b6e
R10: dffffc0000000000 R11: fffffbfff1f00b6f R12: 0000000000000000
R13: dffffc0000000000 R14: 1ffff920016abf5c R15: 1ffff920016abf5c
 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
 smp_call_function_single+0x470/0x590 kernel/smp.c:689
 task_function_call kernel/events/core.c:122 [inline]
 perf_install_in_context+0x593/0x8f0 kernel/events/core.c:3108
 __do_sys_perf_event_open kernel/events/core.c:13816 [inline]
 __se_sys_perf_event_open+0x1966/0x1d90 kernel/events/core.c:13458
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9bd0d8f749
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:00007f9bd1c23038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f9bd0fe5fa0 RCX: 00007f9bd0d8f749
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 00002000000003c0
RBP: 00007f9bd0e13f91 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9bd0fe6038 R14: 00007f9bd0fe5fa0 R15: 00007fff426c1608
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 20042 Comm: syz.1.3832 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:rb_erase+0x5/0xe60 lib/rbtree.c:441
Code: 07 01 00 00 00 eb ca 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 <41> 57 41 56 41 55 41 54 53 48 83 ec 28 48 89 f3 49 89 fd 48 b9 00
RSP: 0018:ffffc90000a07ed8 EFLAGS: 00000046
RAX: ffff8880b8928a60 RBX: ffff8880b89281d0 RCX: ffff888027685b80
RDX: 0000000000010100 RSI: ffff8880b89281d0 RDI: ffff888057e08170
RBP: 1ffff1100afc102e R08: ffffffff8f805b77 R09: 1ffffffff1f00b6e
R10: dffffc0000000000 R11: fffffbfff1f00b6f R12: ffff8880b89281d8
R13: dffffc0000000000 R14: ffff888057e08170 R15: 1ffff1101712503b
FS:  00007fd2d94436c0(0000) GS:ffff8881261b0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055555fafa5c8 CR3: 0000000060e06000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 rb_erase_cached include/linux/rbtree.h:126 [inline]
 timerqueue_del+0xae/0x100 lib/timerqueue.c:57
 __remove_hrtimer kernel/time/hrtimer.c:1114 [inline]
 __run_hrtimer kernel/time/hrtimer.c:1757 [inline]
 __hrtimer_run_queues+0x364/0xc30 kernel/time/hrtimer.c:1841
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
 __sysvec_apic_timer_interrupt+0x102/0x3e0 arch/x86/kernel/apic/apic.c:1062
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1056
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:deref_stack_reg+0x194/0x230 arch/x86/kernel/unwind_orc.c:406
Code: 39 c3 0f 96 c1 4d 39 c6 0f 97 c2 20 c2 20 ca 80 fa 01 75 46 49 8d 40 08 48 39 d8 0f 97 c1 4c 39 f0 0f 96 c0 20 c8 3c 01 75 30 <4c> 89 c7 49 89 f7 e8 11 08 00 00 49 89 c6 48 8b 5c 24 18 48 89 d8
RSP: 0018:ffffc90000a082a0 EFLAGS: 00000202
RAX: ffffc9000458f701 RBX: ffffc90004588000 RCX: 0000000000000001
RDX: ffffc90000a08408 RSI: dffffc0000000000 RDI: ffffc90000a083c8
RBP: 1ffff92000141079 R08: ffffc9000458f7b8 R09: 0000000000000000
R10: ffffc90000a08418 R11: fffff52000141085 R12: 1ffff9200014107a
R13: 1ffff9200014107b R14: ffffc90004590000 R15: ffffc90000a083c8
 unwind_next_frame+0x17c4/0x2390 arch/x86/kernel/unwind_orc.c:-1
 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:56 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
 unpoison_slab_object mm/kasan/common.c:342 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:368
 kasan_slab_alloc include/linux/kasan.h:252 [inline]
 slab_post_alloc_hook mm/slub.c:4948 [inline]
 slab_alloc_node mm/slub.c:5258 [inline]
 kmem_cache_alloc_node_noprof+0x433/0x710 mm/slub.c:5310
 kmalloc_reserve+0xbd/0x290 net/core/skbuff.c:586
 __alloc_skb+0x27e/0x430 net/core/skbuff.c:690
 skb_copy+0x188/0x800 net/core/skbuff.c:2162
 mac80211_hwsim_tx_frame_no_nl+0xcd3/0x11c0 drivers/net/wireless/virtual/mac80211_hwsim.c:1891
 mac80211_hwsim_tx_frame+0x1b5/0x200 drivers/net/wireless/virtual/mac80211_hwsim.c:2264
 mac80211_hwsim_beacon_tx+0x3e8/0x870 drivers/net/wireless/virtual/mac80211_hwsim.c:2365
 __iterate_interfaces+0x2ab/0x590 net/mac80211/util.c:761
 ieee80211_iterate_active_interfaces_atomic+0xdb/0x180 net/mac80211/util.c:797
 mac80211_hwsim_beacon+0xbb/0x180 drivers/net/wireless/virtual/mac80211_hwsim.c:2395
 __run_hrtimer kernel/time/hrtimer.c:1777 [inline]
 __hrtimer_run_queues+0x51c/0xc30 kernel/time/hrtimer.c:1841
 hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1858
 handle_softirqs+0x27d/0x850 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xca/0x1f0 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
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:check_kcov_mode kernel/kcov.c:194 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x37/0x70 kernel/kcov.c:217
Code: 08 00 77 92 65 8b 15 b8 b5 b5 10 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 6c 16 00 00 00 74 2c 8b 91 48 16 00 00 <83> fa 02 75 21 48 8b 91 50 16 00 00 48 8b 32 48 8d 7e 01 8b 89 4c
RSP: 0018:ffffc9000458f870 EFLAGS: 00000246
RAX: ffffffff8175bde2 RBX: 0000000055f6f250 RCX: ffff888027685b80
RDX: 0000000000000002 RSI: 000000000000002e RDI: 0000000000000040
RBP: ffff888055f6f250 R08: 0000000000000001 R09: ffffffff82274cac
R10: dffffc0000000000 R11: fffffbfff1f00b6f R12: ffffea0000000000
R13: 0000000000000000 R14: 000000000000002e R15: dffffc0000000000
 phys_addr_valid arch/x86/mm/physaddr.h:7 [inline]
 __phys_addr+0xb2/0x180 arch/x86/mm/physaddr.c:28
 virt_to_slab mm/slab.h:178 [inline]
 qlink_to_cache mm/kasan/quarantine.c:131 [inline]
 qlist_free_all+0x39/0x100 mm/kasan/quarantine.c:176
 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:352
 kasan_slab_alloc include/linux/kasan.h:252 [inline]
 slab_post_alloc_hook mm/slub.c:4948 [inline]
 slab_alloc_node mm/slub.c:5258 [inline]
 kmem_cache_alloc_lru_noprof+0x35d/0x6d0 mm/slub.c:5277
 __d_alloc+0x37/0x6f0 fs/dcache.c:1691
 d_alloc_pseudo+0x21/0xc0 fs/dcache.c:1822
 alloc_path_pseudo fs/file_table.c:363 [inline]
 alloc_file_pseudo+0xcc/0x210 fs/file_table.c:379
 __anon_inode_getfile fs/anon_inodes.c:166 [inline]
 __anon_inode_getfd fs/anon_inodes.c:283 [inline]
 anon_inode_getfd+0xc8/0x1f0 fs/anon_inodes.c:307
 bpf_prog_load+0x152b/0x1a10 kernel/bpf/syscall.c:3122
 __sys_bpf+0x5c3/0x8a0 kernel/bpf/syscall.c:6207
 __do_sys_bpf kernel/bpf/syscall.c:6320 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6318 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6318
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd2d858f749
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:00007fd2d9443038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fd2d87e5fa0 RCX: 00007fd2d858f749
RDX: 0000000000000094 RSI: 0000200000000880 RDI: 0000000000000005
RBP: 00007fd2d8613f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd2d87e6038 R14: 00007fd2d87e5fa0 R15: 00007fffd5f3f9d8
 </TASK>