watchdog: BUG: soft lockup - CPU#1 stuck for 144s! [syz.8.769:9183] Modules linked in: irq event stamp: 7302833 hardirqs last enabled at (7302832): [] irqentry_exit+0x59c/0x620 kernel/entry/common.c:219 hardirqs last disabled at (7302833): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (6832): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (6832): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (6832): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (6835): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (6835): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (6835): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 9183 Comm: syz.8.769 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026 RIP: 0010:lock_acquire+0x221/0x330 kernel/locking/lockdep.c:5872 Code: ff ff ff e8 61 63 d6 09 f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 4b 44 22 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d a8 93 26 RSP: 0018:ffffc90000a08598 EFLAGS: 00000282 RAX: 9aa2b5bae2cf2800 RBX: 0000000000000000 RCX: 0000000000000101 RDX: 000000008eba6367 RSI: ffffffff8dc1f70e RDI: ffffffff8be094e0 RBP: ffffffff8174a315 R08: ffffffff8174a315 R09: ffffffff8e341b20 R10: ffffc90000a086f8 R11: ffffffff81ae37a0 R12: 0000000000000002 R13: ffffffff8e341b20 R14: 0000000000000000 R15: 0000000000000246 FS: 00007f273c7b06c0(0000) GS:ffff888125b0b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000037d5a000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:867 [inline] class_rcu_constructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0xc2/0x23c0 arch/x86/kernel/unwind_orc.c:495 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 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2540 [inline] slab_free mm/slub.c:6670 [inline] kmem_cache_free+0x195/0x610 mm/slub.c:6781 skb_release_data+0x62d/0x7c0 net/core/skbuff.c:1107 skb_release_all net/core/skbuff.c:1182 [inline] __kfree_skb net/core/skbuff.c:1196 [inline] consume_skb+0x9e/0xf0 net/core/skbuff.c:1428 __ieee80211_rx_handle_packet net/mac80211/rx.c:-1 [inline] ieee80211_rx_list+0x269e/0x3050 net/mac80211/rx.c:5544 ieee80211_rx_napi+0x1b1/0x3e0 net/mac80211/rx.c:5567 ieee80211_rx include/net/mac80211.h:5216 [inline] ieee80211_handle_queued_frames+0xe8/0x1e0 net/mac80211/main.c:452 tasklet_action_common+0x2da/0x4b0 kernel/softirq.c:925 handle_softirqs+0x22a/0x7c0 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:preempt_schedule_irq+0x48/0xa0 kernel/sched/core.c:7190 Code: 49 be 00 00 00 00 00 fc ff df eb 09 48 f7 03 10 00 00 00 74 53 bf 01 00 00 00 e8 43 1b 1b f6 e8 5e aa 53 f6 fb bf 01 00 00 00 e3 a9 ff ff 9c 58 fa a9 00 02 00 00 74 05 e8 e4 ab 53 f6 bf 01 RSP: 0018:ffffc9001b567900 EFLAGS: 00000206 RAX: 0000000000001ab1 RBX: 0000000000000000 RCX: 0000000000000001 RDX: 0000000000000007 RSI: ffffffff8d9b8102 RDI: 0000000000000001 RBP: 0000000000000000 R08: ffffffff8fc25a77 R09: 1ffffffff1f84b4e R10: dffffc0000000000 R11: fffffbfff1f84b4f R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000 irqentry_exit+0x597/0x620 kernel/entry/common.c:216 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:lock_acquire+0x221/0x330 kernel/locking/lockdep.c:5872 Code: ff ff ff e8 61 63 d6 09 f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 4b 44 22 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d a8 93 26 RSP: 0018:ffffc9001b567a20 EFLAGS: 00000282 RAX: 9aa2b5bae2cf2800 RBX: 0000000000000000 RCX: 0000000000000046 RDX: 000000009c93081a RSI: ffffffff8dc1f70e RDI: ffffffff8be094e0 RBP: ffffffff820e5732 R08: ffffffff820e5732 R09: ffff888078805900 R10: dffffc0000000000 R11: ffffed100f100b14 R12: 0000000000000001 R13: ffff888078805900 R14: 0000000000000001 R15: 0000000000000246 down_read_trylock+0x210/0x380 kernel/locking/rwsem.c:1579 mmap_read_trylock include/linux/mmap_lock.h:410 [inline] get_mmap_lock_carefully mm/mmap_lock.c:390 [inline] lock_mm_and_find_vma+0x32/0x2f0 mm/mmap_lock.c:450 do_user_addr_fault+0x330/0x1360 arch/x86/mm/fault.c:1359 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 RIP: 0010:rep_movs_alternative+0x4a/0x90 arch/x86/lib/copy_user_64.S:74 Code: cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 db 83 f9 08 73 e8 eb c5 a4 e9 3f 47 04 00 48 8b 06 48 89 07 48 8d 47 08 48 83 e0 f8 48 RSP: 0018:ffffc9001b567cf8 EFLAGS: 00050202 RAX: 00007ffffffff001 RBX: 0000000000000050 RCX: 0000000000000050 RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffffc9001b567d60 RBP: ffffc9001b567eb8 R08: ffffc9001b567daf R09: 1ffff920036acfb5 R10: dffffc0000000000 R11: fffff520036acfb6 R12: dffffc0000000000 R13: 0000000000000050 R14: ffffc9001b567d60 R15: 0000000000000000 copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline] raw_copy_from_user arch/x86/include/asm/uaccess_64.h:141 [inline] _inline_copy_from_user include/linux/uaccess.h:185 [inline] _copy_from_user+0x7a/0xb0 lib/usercopy.c:18 copy_from_user include/linux/uaccess.h:223 [inline] copy_from_bpfptr_offset include/linux/bpfptr.h:53 [inline] copy_from_bpfptr include/linux/bpfptr.h:59 [inline] __sys_bpf+0x229/0x950 kernel/bpf/syscall.c:6178 __do_sys_bpf kernel/bpf/syscall.c:6318 [inline] __se_sys_bpf kernel/bpf/syscall.c:6316 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6316 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f273b99acb9 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:00007f273c7b0028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f273bc16090 RCX: 00007f273b99acb9 RDX: 0000000000000050 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f273ba08bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f273bc16128 R14: 00007f273bc16090 R15: 00007fff27a753a8 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 15 Comm: ksoftirqd/0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026 RIP: 0010:tasklet_action+0x35/0x70 kernel/softirq.c:953 Code: 00 e8 3f 65 ef 09 89 c3 83 f8 08 73 3c 48 8d 1c dd d0 3d c6 8d 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 <74> 08 48 89 df e8 a1 a6 a3 00 48 c7 c7 40 92 c1 92 48 03 3b be 06 RSP: 0018:ffffc90000147c48 EFLAGS: 00000246 RAX: 1ffffffff1b8c7ba RBX: ffffffff8dc63dd0 RCX: dffffc0000000000 RDX: 0000000000000100 RSI: ffffffff8be094c0 RDI: ffffffff8be09480 RBP: ffffffff8e00c0f0 R08: ffffffff8fc25a77 R09: 1ffffffff1f84b4e R10: dffffc0000000000 R11: ffffffff818623e0 R12: 0000000080000100 R13: 0000000000000006 R14: 0000000000000007 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888125a0b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff7a2ef7e80 CR3: 00000000318ea000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: handle_softirqs+0x22a/0x7c0 kernel/softirq.c:622 run_ksoftirqd+0x36/0x60 kernel/softirq.c:1063 smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160 kthread+0x726/0x8b0 kernel/kthread.c:463 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246