watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor.4:31062] Modules linked in: irq event stamp: 6606749 hardirqs last enabled at (6606748): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] hardirqs last enabled at (6606748): [] _raw_spin_unlock_irq+0x27/0x80 kernel/locking/spinlock.c:192 hardirqs last disabled at (6606749): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (431182): [] __do_softirq+0x62d/0x919 kernel/softirq.c:318 softirqs last disabled at (431261): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (431261): [] irq_exit+0x17f/0x1c0 kernel/softirq.c:412 CPU: 0 PID: 31062 Comm: syz-executor.4 Not tainted 4.19.205-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:debug_spin_lock_before kernel/locking/spinlock_debug.c:83 [inline] RIP: 0010:do_raw_spin_lock+0x43/0x240 kernel/locking/spinlock_debug.c:112 Code: 83 c7 04 48 89 fa 48 83 ec 08 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 bb 01 00 00 8b 43 04 <3d> ad 4e ad de 0f 85 5e 01 00 00 4c 8d 6b 10 48 b8 00 00 00 00 00 RSP: 0018:ffff8881f6807c60 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 00000000dead4ead RBX: ffff8881df9a45a8 RCX: 1ffff1103b1f5d27 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881df9a45ac RBP: ffff8881f6807c88 R08: 000000000000596f R09: 0000000000000002 R10: ffff8881d8fae918 R11: 0000000000000001 R12: ffff8881ea7abac0 R13: ffff8881f6807dd0 R14: ffff8881df9a47b0 R15: ffff8881df9a45a8 FS: 00007f19a5397700(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055ade51d7140 CR3: 000000000806d003 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline] _raw_spin_lock+0x35/0x40 kernel/locking/spinlock.c:144 spin_lock include/linux/spinlock.h:329 [inline] pie_timer+0x8e/0x670 net/sched/sch_pie.c:433 call_timer_fn+0x14c/0x510 kernel/time/timer.c:1338 expire_timers kernel/time/timer.c:1375 [inline] __run_timers kernel/time/timer.c:1696 [inline] __run_timers kernel/time/timer.c:1664 [inline] run_timer_softirq+0xb63/0x1180 kernel/time/timer.c:1709 __do_softirq+0x25f/0x919 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x17f/0x1c0 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x13e/0x540 arch/x86/kernel/apic/apic.c:1098 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:__read_once_size include/linux/compiler.h:261 [inline] RIP: 0010:compound_head include/linux/page-flags.h:142 [inline] RIP: 0010:mark_page_accessed+0x2d/0xb00 mm/swap.c:374 Code: 00 00 00 00 fc ff df 55 48 89 e5 41 57 41 56 41 55 41 54 4c 8d 67 08 4c 89 e2 53 48 89 fb 48 c1 ea 03 48 83 ec 08 80 3c 02 00 <0f> 85 4d 08 00 00 48 8b 43 08 a8 01 0f 85 4a 05 00 00 48 b8 00 00 RSP: 0018:ffff8881af3476e0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: ffffea00073bd500 RCX: ffffea00073bd508 RDX: 1ffffd4000e77aa1 RSI: 0000000000000000 RDI: ffffea00073bd500 RBP: ffff8881af347710 R08: ffffea00073bd500 R09: fffff94000e77a9e R10: fffff94000e77a9e R11: ffffea00073bd4f3 R12: ffffea00073bd508 R13: ffff8881af347960 R14: 00000000004b3000 R15: dffffc0000000000 zap_pte_range mm/memory.c:1347 [inline] zap_pmd_range mm/memory.c:1463 [inline] zap_pud_range mm/memory.c:1492 [inline] zap_p4d_range mm/memory.c:1513 [inline] unmap_page_range+0xa31/0x2270 mm/memory.c:1534 unmap_single_vma+0x121/0x300 mm/memory.c:1579 unmap_vmas+0xe7/0x1a0 mm/memory.c:1609 exit_mmap+0x251/0x470 mm/mmap.c:3093 __mmput kernel/fork.c:1015 [inline] mmput+0x107/0x3f0 kernel/fork.c:1036 exit_mm kernel/exit.c:549 [inline] do_exit+0x9ce/0x2cf0 kernel/exit.c:857 do_group_exit+0xf4/0x2f0 kernel/exit.c:967 get_signal+0x316/0x19e0 kernel/signal.c:2589 do_signal+0x87/0x1960 arch/x86/kernel/signal.c:799 exit_to_usermode_loop+0x114/0x200 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x413/0x4e0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x461209 Code: Bad RIP value. RSP: 002b:00007f19a5397218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000052bf08 RCX: 0000000000461209 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000052bf08 RBP: 000000000052bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000052bf0c R13: 00007ffc7526dd9f R14: 00007f19a5397300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 83 c7 04 add $0x4,%edi 3: 48 89 fa mov %rdi,%rdx 6: 48 83 ec 08 sub $0x8,%rsp a: 48 c1 ea 03 shr $0x3,%rdx e: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx 12: 48 89 f8 mov %rdi,%rax 15: 83 e0 07 and $0x7,%eax 18: 83 c0 03 add $0x3,%eax 1b: 38 d0 cmp %dl,%al 1d: 7c 08 jl 0x27 1f: 84 d2 test %dl,%dl 21: 0f 85 bb 01 00 00 jne 0x1e2 27: 8b 43 04 mov 0x4(%rbx),%eax * 2a: 3d ad 4e ad de cmp $0xdead4ead,%eax <-- trapping instruction 2f: 0f 85 5e 01 00 00 jne 0x193 35: 4c 8d 6b 10 lea 0x10(%rbx),%r13 39: 48 rex.W 3a: b8 00 00 00 00 mov $0x0,%eax