watchdog: BUG: soft lockup - CPU#1 stuck for 123s! [syz-executor.4:12986] Modules linked in: irq event stamp: 13993297 hardirqs last enabled at (13993296): [] asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632 hardirqs last disabled at (13993297): [] sysvec_apic_timer_interrupt+0xa/0xb0 arch/x86/kernel/apic/apic.c:1100 softirqs last enabled at (13124734): [] invoke_softirq kernel/softirq.c:221 [inline] softirqs last enabled at (13124734): [] __irq_exit_rcu+0x1d8/0x200 kernel/softirq.c:422 softirqs last disabled at (13124737): [] invoke_softirq kernel/softirq.c:221 [inline] softirqs last disabled at (13124737): [] __irq_exit_rcu+0x1d8/0x200 kernel/softirq.c:422 CPU: 1 PID: 12986 Comm: syz-executor.4 Not tainted 5.12.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__read_once_word_nocheck+0x0/0x10 include/asm-generic/rwonce.h:67 Code: fd ff ff 4c 89 f7 e8 7f ed 87 00 e9 ef fd ff ff 89 d9 80 e1 07 38 c1 0f 8c c3 fc ff ff 48 89 df e8 95 ed 87 00 e9 b6 fc ff ff <48> 8b 07 c3 66 66 2e 0f 1f 84 00 00 00 00 00 90 be 16 00 00 00 48 RSP: 0018:ffffc90000dc0630 EFLAGS: 00000287 RAX: ffffc90000dc0b50 RBX: ffffc90000dc0738 RCX: 0000000000000000 RDX: ffffc90000dc0b48 RSI: 0000000000000001 RDI: ffffc90000dc0b48 RBP: ffffc90000dc0b48 R08: dffffc0000000000 R09: ffffc90000dc0748 R10: fffff520001b80eb R11: 0000000000000000 R12: ffffc90000db9000 R13: ffffc90000dc06f8 R14: dffffc0000000000 R15: 1ffff920001b80df FS: 00007f37470f3700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9807c16008 CR3: 000000001c5f4000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: deref_stack_reg arch/x86/kernel/unwind_orc.c:355 [inline] unwind_next_frame+0x12ad/0x1f90 arch/x86/kernel/unwind_orc.c:587 arch_stack_walk+0xb2/0xe0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xad/0x150 kernel/stacktrace.c:121 kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:427 [inline] __kasan_slab_alloc+0x8f/0xc0 mm/kasan/common.c:460 kasan_slab_alloc include/linux/kasan.h:223 [inline] slab_post_alloc_hook mm/slab.h:516 [inline] slab_alloc_node mm/slub.c:2907 [inline] kmem_cache_alloc_node+0x1e3/0x380 mm/slub.c:2943 __alloc_skb+0xd8/0x580 net/core/skbuff.c:412 skb_copy+0xe8/0x750 net/core/skbuff.c:1561 mac80211_hwsim_tx_frame_no_nl+0xd41/0x1860 drivers/net/wireless/mac80211_hwsim.c:1563 mac80211_hwsim_tx_frame+0x143/0x180 drivers/net/wireless/mac80211_hwsim.c:1775 mac80211_hwsim_beacon_tx+0x4b9/0x870 drivers/net/wireless/mac80211_hwsim.c:1829 __iterate_interfaces+0x23e/0x4b0 net/mac80211/util.c:793 ieee80211_iterate_active_interfaces_atomic+0x9b/0x120 net/mac80211/util.c:829 mac80211_hwsim_beacon+0xa4/0x180 drivers/net/wireless/mac80211_hwsim.c:1852 __run_hrtimer kernel/time/hrtimer.c:1537 [inline] __hrtimer_run_queues+0x4c9/0xa00 kernel/time/hrtimer.c:1601 hrtimer_run_softirq+0x176/0x1e0 kernel/time/hrtimer.c:1618 __do_softirq+0x318/0x714 kernel/softirq.c:345 invoke_softirq kernel/softirq.c:221 [inline] __irq_exit_rcu+0x1d8/0x200 kernel/softirq.c:422 irq_exit_rcu+0x5/0x20 kernel/softirq.c:434 sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632 RIP: 0010:lock_is_held_type+0x129/0x180 arch/x86/include/asm/irqflags.h:45 Code: 05 ac e0 af 76 83 f8 01 75 38 9c 8f 04 24 f7 04 24 00 02 00 00 75 46 41 f7 c4 00 02 00 00 74 01 fb 65 48 8b 04 25 28 00 00 00 <48> 3b 44 24 08 75 3c 89 d8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f RSP: 0018:ffffc9000281fc98 EFLAGS: 00000206 RAX: 4e821dbcdcb25100 RBX: 0000000000000001 RCX: 0000000000000001 RDX: ffff88801dc11c40 RSI: 0000000000000003 RDI: 0000000000000000 RBP: 0000000000000004 R08: ffffffff81d4e772 R09: fffff52000503f94 R10: fffff52000503f94 R11: 0000000000000000 R12: 0000000000000246 R13: ffff88801dc11c40 R14: 00000000ffffffff R15: ffff8880540da920 lock_is_held include/linux/lockdep.h:278 [inline] __seqprop_spinlock_assert include/linux/seqlock.h:277 [inline] chroot_fs_refs+0x141/0x5c0 fs/fs_struct.c:71 __do_sys_pivot_root fs/namespace.c:3809 [inline] __se_sys_pivot_root+0x1dab/0x1f10 fs/namespace.c:3726 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x466459 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f37470f3188 EFLAGS: 00000246 ORIG_RAX: 000000000000009b RAX: ffffffffffffffda RBX: 000000000056c0b0 RCX: 0000000000466459 RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000020000100 RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c0b0 R13: 00007ffdebb7908f R14: 00007f37470f3300 R15: 0000000000022000 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 77 Comm: kworker/u4:2 Not tainted 5.12.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound call_usermodehelper_exec_work RIP: 0010:queued_write_lock_slowpath+0x112/0x290 kernel/locking/qrwlock.c:76 Code: 0f 1f 84 00 00 00 00 00 42 8a 04 23 84 c0 74 38 89 e9 80 e1 07 80 c1 03 38 c1 7c 2c 48 89 ef e8 44 4b 5e 00 eb 22 66 90 f3 90 <42> 0f b6 04 23 84 c0 74 15 89 e9 80 e1 07 80 c1 03 38 c1 7c 09 48 RSP: 0018:ffffc9000105f918 EFLAGS: 00000006 RAX: 0000000000000300 RBX: 1ffffffff1881408 RCX: ffffffff815eb3e9 RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8c40a040 RBP: ffffffff8c40a040 R08: dffffc0000000000 R09: fffffbfff1881409 R10: fffffbfff1881409 R11: 0000000000000000 R12: dffffc0000000000 R13: dffffc0000000000 R14: ffffffff8c40a044 R15: 00000000000000ff FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000564e122f18e8 CR3: 00000000466b5000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: queued_write_lock include/asm-generic/qrwlock.h:97 [inline] do_raw_write_lock+0x2ff/0x450 kernel/locking/spinlock_debug.c:207 __raw_write_lock_irq include/linux/rwlock_api_smp.h:197 [inline] _raw_write_lock_irq+0x7b/0xa0 kernel/locking/spinlock.c:311 copy_process+0x3002/0x5690 kernel/fork.c:2232 kernel_clone+0x1a6/0x6c0 kernel/fork.c:2500 kernel_thread+0xdd/0x120 kernel/fork.c:2552 call_usermodehelper_exec_work+0x57/0x220 kernel/umh.c:172 process_one_work+0x789/0xfd0 kernel/workqueue.c:2275 worker_thread+0xac1/0x1300 kernel/workqueue.c:2421 kthread+0x39a/0x3c0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294