watchdog: BUG: soft lockup - CPU#1 stuck for 123s! [syz-executor.2:22708] Modules linked in: irq event stamp: 14836647 hardirqs last enabled at (14836646): [] asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632 hardirqs last disabled at (14836647): [] sysvec_apic_timer_interrupt+0xa/0xb0 arch/x86/kernel/apic/apic.c:1100 softirqs last enabled at (12055832): [] invoke_softirq kernel/softirq.c:221 [inline] softirqs last enabled at (12055832): [] __irq_exit_rcu+0x1d8/0x200 kernel/softirq.c:422 softirqs last disabled at (12055835): [] invoke_softirq kernel/softirq.c:221 [inline] softirqs last disabled at (12055835): [] __irq_exit_rcu+0x1d8/0x200 kernel/softirq.c:422 CPU: 1 PID: 22708 Comm: syz-executor.2 Not tainted 5.12.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:lock_acquire+0x18d/0x650 arch/x86/include/asm/irqflags.h:45 Code: 8d 7c 24 20 e8 c4 a5 60 00 f7 44 24 20 00 02 00 00 0f 85 38 02 00 00 41 f7 c7 00 02 00 00 74 01 fb 65 48 8b 04 25 28 00 00 00 <48> 3b 44 24 50 0f 85 62 04 00 00 48 83 c4 58 5b 41 5c 41 5d 41 5e RSP: 0018:ffffc90000dc0b20 EFLAGS: 00000206 RAX: 601610a0208ed500 RBX: 0000000000000002 RCX: ffffffff815c7db5 RDX: 0000000000000000 RSI: 0000000000000102 RDI: 0000000000000000 RBP: 1ffff920001b8168 R08: dffffc0000000000 R09: fffffbfff1f272b1 R10: fffffbfff1f272b1 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffffffff8c7102c0 R15: 0000000000000246 FS: 00007f9c1e967700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8502f2bbd0 CR3: 000000005a60b000 CR4: 00000000001526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:267 rcu_read_lock include/linux/rcupdate.h:656 [inline] ieee80211_get_buffered_bc+0x3e/0x7a0 net/mac80211/tx.c:5233 mac80211_hwsim_beacon_tx+0x4c4/0x870 drivers/net/wireless/mac80211_hwsim.c:1832 __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_acquire+0x18d/0x650 arch/x86/include/asm/irqflags.h:45 Code: 8d 7c 24 20 e8 c4 a5 60 00 f7 44 24 20 00 02 00 00 0f 85 38 02 00 00 41 f7 c7 00 02 00 00 74 01 fb 65 48 8b 04 25 28 00 00 00 <48> 3b 44 24 50 0f 85 62 04 00 00 48 83 c4 58 5b 41 5c 41 5d 41 5e RSP: 0018:ffffc90001a9fc38 EFLAGS: 00000206 RAX: 601610a0208ed500 RBX: 0000000000000000 RCX: ffffffff815c7e82 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000 RBP: 1ffff92000353f8b R08: dffffc0000000000 R09: fffffbfff1f272b3 R10: fffffbfff1f272b3 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000001 R14: ffff8880254a5da8 R15: 0000000000000246 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:354 [inline] task_lock include/linux/sched/task.h:168 [inline] chroot_fs_refs+0xbf/0x5c0 fs/fs_struct.c:66 __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:00007f9c1e967188 EFLAGS: 00000246 ORIG_RAX: 000000000000009b RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459 RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000020000300 RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007fff3a22116f R14: 00007f9c1e967300 R15: 0000000000022000 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 22713 Comm: kworker/u4:13 Not tainted 5.12.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:queued_write_lock_slowpath+0x117/0x290 kernel/locking/qrwlock.c:76 Code: 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 54 53 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 89 ef e8 31 53 RSP: 0018:ffffc90001c0fd78 EFLAGS: 00000006 RAX: 0000000000000000 RBX: 1ffffffff1881408 RCX: ffffffff815eb709 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: 0000001b2e121000 CR3: 0000000042dc3000 CR4: 00000000001526f0 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 exit_notify kernel/exit.c:667 [inline] do_exit+0x739/0x2290 kernel/exit.c:845 call_usermodehelper_exec_async+0x39c/0x3a0 kernel/umh.c:123 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294