watchdog: BUG: soft lockup - CPU#1 stuck for 144s! [syz.5.481:8687] Modules linked in: irq event stamp: 11007565 hardirqs last enabled at (11007564): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:357 hardirqs last disabled at (11007565): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1049 softirqs last enabled at (10985424): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last enabled at (10985424): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last enabled at (10985424): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 softirqs last disabled at (10985427): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (10985427): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (10985427): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 CPU: 1 UID: 0 PID: 8687 Comm: syz.5.481 Not tainted 6.15.0-rc4-syzkaller-gb4432656b36e #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:__read_once_word_nocheck+0x3/0x10 include/asm-generic/rwonce.h:67 Code: af 00 48 ba 00 00 00 00 00 fc ff df e9 88 fc ff ff 66 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 8b 07 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc90000a083d0 EFLAGS: 00000202 RAX: ffffffff8937fba2 RBX: ffffc90000a088f0 RCX: 1ffff92000141001 RDX: ffffffff9091d240 RSI: 0000000000000002 RDI: ffffc90000a088f0 RBP: 1ffff92000141096 R08: 000000000000000a R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff817199f5 R12: ffffc90000a09000 R13: 1ffff92000141097 R14: ffffc90000a084a8 R15: ffffc90000a01000 FS: 00007f43de5f86c0(0000) GS:ffff8881261cc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f43de595d58 CR3: 0000000023dec000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: deref_stack_reg arch/x86/kernel/unwind_orc.c:406 [inline] unwind_next_frame+0xc3c/0x2390 arch/x86/kernel/unwind_orc.c:585 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:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4161 [inline] slab_alloc_node mm/slub.c:4210 [inline] kmem_cache_alloc_node_noprof+0x1bb/0x3c0 mm/slub.c:4262 kmalloc_reserve+0xbd/0x290 net/core/skbuff.c:577 __alloc_skb+0x142/0x2d0 net/core/skbuff.c:668 __netdev_alloc_skb+0x108/0x970 net/core/skbuff.c:732 netdev_alloc_skb include/linux/skbuff.h:3413 [inline] dev_alloc_skb include/linux/skbuff.h:3426 [inline] __ieee80211_beacon_get+0xe32/0x1630 net/mac80211/tx.c:5475 ieee80211_beacon_get_tim+0xb4/0x2b0 net/mac80211/tx.c:5597 ieee80211_beacon_get include/net/mac80211.h:5648 [inline] mac80211_hwsim_beacon_tx+0x3d2/0x860 drivers/net/wireless/virtual/mac80211_hwsim.c:2313 __iterate_interfaces+0x2a8/0x590 net/mac80211/util.c:761 ieee80211_iterate_active_interfaces_atomic+0xdb/0x180 net/mac80211/util.c:797 mac80211_hwsim_beacon+0xbb/0x1c0 drivers/net/wireless/virtual/mac80211_hwsim.c:2347 __run_hrtimer kernel/time/hrtimer.c:1761 [inline] __hrtimer_run_queues+0x529/0xc60 kernel/time/hrtimer.c:1825 hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1842 handle_softirqs+0x283/0x870 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline] sysvec_irq_work+0xa3/0xc0 arch/x86/kernel/irq_work.c:17 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:738 RIP: 0010:raw_spin_rq_unlock_irq+0x13/0x90 kernel/sched/sched.h:1526 Code: cc e8 41 ec c2 09 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 57 41 56 53 66 90 e8 84 6f c5 09 e8 ef 51 34 00 fb 5b <41> 5e 41 5f c3 cc cc cc cc cc f3 0f 1e fa 49 be 00 00 00 00 00 fc RSP: 0018:ffffc900042e7708 EFLAGS: 00000286 RAX: e07db004c0788f00 RBX: ffff888026142580 RCX: e07db004c0788f00 RDX: 0000000000000000 RSI: ffffffff8d749f78 RDI: ffffffff8bc1cde0 RBP: ffffc900042e7930 R08: ffffffff8f7ed377 R09: 1ffffffff1efda6e R10: dffffc0000000000 R11: fffffbfff1efda6f R12: ffff888026141e00 R13: dffffc0000000000 R14: ffff888026141e00 R15: ffff8880b8939b40 __schedule+0x1932/0x4cd0 kernel/sched/core.c:6771 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:6947 preempt_schedule+0xae/0xc0 kernel/sched/core.c:6971 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline] _raw_spin_unlock+0x3f/0x50 kernel/locking/spinlock.c:186 spin_unlock include/linux/spinlock.h:391 [inline] futex_queue kernel/futex/futex.h:312 [inline] futex_wait_queue+0xad/0x200 kernel/futex/waitwake.c:352 __futex_wait+0x11e/0x2a0 kernel/futex/waitwake.c:668 futex_wait+0x104/0x360 kernel/futex/waitwake.c:696 do_futex+0x333/0x420 kernel/futex/syscalls.c:102 __do_sys_futex kernel/futex/syscalls.c:179 [inline] __se_sys_futex+0x36f/0x400 kernel/futex/syscalls.c:160 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f43dd78e969 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:00007f43de5f80e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007f43dd9b5fa8 RCX: 00007f43dd78e969 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f43dd9b5fa8 RBP: 00007f43dd9b5fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f43dd9b5fac R13: 0000000000000000 R14: 00007ffd5866bd20 R15: 00007ffd5866be08 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 8697 Comm: syz.4.483 Not tainted 6.15.0-rc4-syzkaller-gb4432656b36e #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:hrtimer_update_base kernel/time/hrtimer.c:-1 [inline] RIP: 0010:hrtimer_interrupt+0x26f/0xaa0 kernel/time/hrtimer.c:1869 Code: 70 48 8d 53 44 48 8d 73 78 4c 8d 7b 68 48 8d 6b 54 c7 44 24 2c 02 00 00 00 48 89 44 24 58 48 c1 e8 03 48 89 84 24 88 00 00 00 <48> 89 8c 24 80 00 00 00 48 c1 e9 03 48 89 4c 24 50 48 89 54 24 10 RSP: 0018:ffffc90000007a78 EFLAGS: 00000806 RAX: 1ffff11017104ee4 RBX: ffff8880b88276c0 RCX: ffff8880b8827730 RDX: ffff8880b8827704 RSI: ffff8880b8827738 RDI: ffff8880b8827928 RBP: ffff8880b8827714 R08: ffffc9000000770f R09: 0000000000000000 R10: ffffc90000007700 R11: ffffffff8166cd10 R12: 000000fbb620adce R13: ffff8880b8827b28 R14: dffffc0000000000 R15: ffff8880b8827728 FS: 0000000000000000(0000) GS:ffff8881260cc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055558c6345c8 CR3: 000000005fd32000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline] __sysvec_apic_timer_interrupt+0x108/0x410 arch/x86/kernel/apic/apic.c:1055 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202 Code: 90 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 9a c1 45 f6 48 89 df e8 c2 58 46 f6 e8 cd e0 6e f6 fb bf 01 00 00 00 d2 62 38 f6 65 8b 05 bb e4 1c 07 85 c0 74 07 5b c3 cc cc cc cc RSP: 0018:ffffc90000007c90 EFLAGS: 00000286 RAX: 48ed7d1d6dd16200 RBX: ffff8880b8825540 RCX: 48ed7d1d6dd16200 RDX: 0000000000000003 RSI: ffffffff8d749f78 RDI: 0000000000000001 RBP: ffffc90000007e10 R08: ffffffff8f7ed377 R09: 1ffffffff1efda6e R10: dffffc0000000000 R11: fffffbfff1efda6f R12: ffff8880b8825540 R13: 1ffff92000000fac R14: ffff8880110d7c10 R15: ffffc90000007d60 expire_timers kernel/time/timer.c:1839 [inline] __run_timers kernel/time/timer.c:2414 [inline] __run_timer_base+0x60a/0x860 kernel/time/timer.c:2426 run_timer_base kernel/time/timer.c:2435 [inline] run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2445 handle_softirqs+0x283/0x870 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:check_region_inline mm/kasan/generic.c:171 [inline] RIP: 0010:kasan_check_range+0x18/0x2b0 mm/kasan/generic.c:189 Code: cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 b0 01 48 85 f6 0f 84 b8 01 00 00 55 41 57 41 56 41 55 41 54 <53> 4c 8d 04 37 49 39 f8 0f 82 6c 02 00 00 49 89 f9 49 c1 e9 2f 41 RSP: 0018:ffffc900039270b8 EFLAGS: 00000202 RAX: ffffffff82192901 RBX: ffffea00004831c0 RCX: ffffffff821929a3 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffea00004831c0 RBP: ffffc900039273a8 R08: ffffea0000483187 R09: 1ffffd4000090630 R10: dffffc0000000000 R11: fffff94000090631 R12: dffffc0000000000 R13: 1ffffd4000090639 R14: ffffea00004831c8 R15: 0000000000000000 instrument_atomic_read include/linux/instrumented.h:68 [inline] _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] folio_test_swapbacked include/linux/page-flags.h:574 [inline] folio_test_swapcache include/linux/page-flags.h:621 [inline] free_swap_cache+0x63/0x300 mm/swap_state.c:227 free_pages_and_swap_cache+0x17a/0x520 mm/swap_state.c:260 __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline] tlb_batch_pages_flush mm/mmu_gather.c:149 [inline] tlb_flush_mmu_free mm/mmu_gather.c:397 [inline] tlb_flush_mmu+0x3a0/0x680 mm/mmu_gather.c:404 zap_pte_range mm/memory.c:1770 [inline] zap_pmd_range mm/memory.c:1823 [inline] zap_pud_range mm/memory.c:1852 [inline] zap_p4d_range mm/memory.c:1873 [inline] unmap_page_range+0x37fd/0x4210 mm/memory.c:1894 unmap_vmas+0x25d/0x3c0 mm/memory.c:1984 exit_mmap+0x245/0xba0 mm/mmap.c:1284 __mmput+0x118/0x420 kernel/fork.c:1379 exit_mm+0x1da/0x2c0 kernel/exit.c:589 do_exit+0x859/0x2550 kernel/exit.c:940 do_group_exit+0x21c/0x2d0 kernel/exit.c:1102 get_signal+0x125e/0x1310 kernel/signal.c:3034 arch_do_signal_or_restart+0x95/0x780 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x8b/0x120 kernel/entry/common.c:218 do_syscall_64+0x103/0x210 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f29b718e969 Code: Unable to access opcode bytes at 0x7f29b718e93f. RSP: 002b:00007f29b7f6a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000035 RAX: ffffffffffffffa1 RBX: 00007f29b73b5fa0 RCX: 00007f29b718e969 RDX: 0000000000000088 RSI: 0000000000000002 RDI: 0000000000000002 RBP: 00007f29b7210ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000200000000580 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f29b73b5fa0 R15: 00007fffd775b5b8