watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.2:14771] Modules linked in: irq event stamp: 3332981 hardirqs last enabled at (3332980): [] trace_hardirqs_on_thunk+0x1a/0x1c hardirqs last disabled at (3332981): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (19010): [] spin_unlock_bh include/linux/spinlock.h:374 [inline] softirqs last enabled at (19010): [] wb_wakeup fs/fs-writeback.c:174 [inline] softirqs last enabled at (19010): [] wb_start_writeback fs/fs-writeback.c:1020 [inline] softirqs last enabled at (19010): [] __wakeup_flusher_threads_bdi.part.0+0x162/0x220 fs/fs-writeback.c:2041 softirqs last disabled at (19127): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (19127): [] irq_exit+0x215/0x260 kernel/softirq.c:412 CPU: 0 PID: 14771 Comm: syz-executor.2 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xa3/0xe0 kernel/locking/spinlock.c:184 Code: 48 c7 c0 88 82 f1 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 2f 48 83 3d 7c 31 d8 01 00 74 15 48 89 df 57 9d <0f> 1f 44 00 00 eb b2 e8 fb eb e6 f8 eb c0 0f 0b 0f 0b 48 c7 c7 88 RSP: 0018:ffff8880ba007bb8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff13e3051 RBX: 0000000000000286 RCX: 1ffff1100942f9d7 RDX: dffffc0000000000 RSI: ffff88804a17ce98 RDI: 0000000000000286 RBP: ffff8880ba022b40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000022b40 R14: 0000000000000000 R15: ffff8880ba022b40 FS: 00007feedc7bf700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2df24000 CR3: 0000000039031000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __mod_timer kernel/time/timer.c:1071 [inline] mod_timer+0x4ea/0x1010 kernel/time/timer.c:1114 pie_timer+0x67b/0x740 net/sched/sch_pie.c:438 call_timer_fn+0x177/0x700 kernel/time/timer.c:1338 expire_timers+0x243/0x4e0 kernel/time/timer.c:1375 __run_timers kernel/time/timer.c:1696 [inline] run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1709 __do_softirq+0x265/0x980 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x215/0x260 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1098 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:lock_acquire+0x1ec/0x3c0 kernel/locking/lockdep.c:3911 Code: 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 b7 01 00 00 48 83 3d 09 2e a6 08 00 0f 84 2a 01 00 00 48 8b 7c 24 08 57 9d <0f> 1f 44 00 00 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f c3 65 8b RSP: 0018:ffff8880395cfde0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff13e3051 RBX: ffff88804a17c5c0 RCX: 00000000000031dd RDX: dffffc0000000000 RSI: 0000000003b0159a RDI: 0000000000000286 RBP: ffff8880b0be8690 R08: ffffffff8cd30428 R09: 0000000000000000 R10: ffff88804a17ce48 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000001 down_read+0x36/0x80 kernel/locking/rwsem.c:24 iterate_supers+0xdb/0x290 fs/super.c:631 ksys_sync+0x86/0x150 fs/sync.c:113 __ia32_sys_sync+0xa/0x10 fs/sync.c:124 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7feedde4a0e9 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007feedc7bf168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007feeddf5cf60 RCX: 00007feedde4a0e9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007feeddea408d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd429cf89f R14: 00007feedc7bf300 R15: 0000000000022000 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 14803 Comm: syz-executor.4 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:entity_before kernel/sched/fair.c:521 [inline] RIP: 0010:__enqueue_entity kernel/sched/fair.c:576 [inline] RIP: 0010:put_prev_entity+0x10e/0x17e0 kernel/sched/fair.c:4246 Code: 00 4d 8b 4c 24 58 41 be 01 00 00 00 48 ba 00 00 00 00 00 fc ff df eb 03 48 89 c5 48 8d 7d 40 48 89 f8 48 c1 e8 03 80 3c 10 00 <0f> 85 64 11 00 00 4c 3b 4d 40 4c 8d 7d 10 78 07 4c 8d 7d 08 45 31 RSP: 0018:ffff8880397b75c0 EFLAGS: 00000046 RAX: 1ffff110139cf82b RBX: ffff8880ba12b180 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: ffff8880ba12b1b0 RDI: ffff88809ce7c158 RBP: ffff88809ce7c118 R08: ffff8880ba12b180 R09: 0000004c5d40a745 R10: 0000000000000001 R11: 0000000000000005 R12: ffff88803ddd2380 R13: ffff8880ba12b2f0 R14: 0000000000000000 R15: ffff888097c06660 FS: 00007f09216fd700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffef49f5c20 CR3: 0000000041043000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: pick_next_task_fair+0xc7a/0x1570 kernel/sched/fair.c:6807 pick_next_task kernel/sched/core.c:3363 [inline] __schedule+0x457/0x2040 kernel/sched/core.c:3491 preempt_schedule_irq+0xb0/0x140 kernel/sched/core.c:3744 retint_kernel+0x1b/0x2d RIP: 0010:___might_sleep+0x0/0x2b0 kernel/sched/core.c:6150 Code: dc 0f 0b 48 c7 c7 80 82 f1 89 e8 fb ef 56 00 eb b6 e8 f4 ef 56 00 e9 2b ff ff ff e8 5a ef 56 00 e9 5f ff ff ff 0f 1f 44 00 00 <41> 56 41 55 41 54 41 89 f4 55 48 89 fd 53 89 d3 e8 5b 2b 0f 00 85 RSP: 0018:ffff8880397b78e0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000040000 RBX: ffff8880aac17880 RCX: ffffc90009b57000 RDX: 0000000000000000 RSI: 00000000000002e5 RDI: ffffffff8872a440 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000007 R11: 0000000000000000 R12: 0000000000002207 R13: 0000000000000001 R14: dffffc0000000000 R15: ffff8880aac178d0 __get_user_pages+0x5c8/0x1710 mm/gup.c:741 __get_user_pages_locked mm/gup.c:916 [inline] get_user_pages_remote+0x220/0x460 mm/gup.c:1108 process_vm_rw_single_vec mm/process_vm_access.c:113 [inline] process_vm_rw_core.constprop.0+0x400/0xb00 mm/process_vm_access.c:220 process_vm_rw+0x21a/0x250 mm/process_vm_access.c:288 __do_sys_process_vm_writev mm/process_vm_access.c:310 [inline] __se_sys_process_vm_writev mm/process_vm_access.c:305 [inline] __x64_sys_process_vm_writev+0xdf/0x1b0 mm/process_vm_access.c:305 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f0922d880e9 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f09216fd168 EFLAGS: 00000246 ORIG_RAX: 0000000000000137 RAX: ffffffffffffffda RBX: 00007f0922e9af60 RCX: 00007f0922d880e9 RDX: 0000000000000001 RSI: 0000000020c22000 RDI: 0000000000001118 RBP: 00007f0922de208d R08: 0000000000000001 R09: 0000000000000000 R10: 0000000020c22fa0 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdf350ee3f R14: 00007f09216fd300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 48 c7 c0 88 82 f1 89 mov $0xffffffff89f18288,%rax 7: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx e: fc ff df 11: 48 c1 e8 03 shr $0x3,%rax 15: 80 3c 10 00 cmpb $0x0,(%rax,%rdx,1) 19: 75 2f jne 0x4a 1b: 48 83 3d 7c 31 d8 01 cmpq $0x0,0x1d8317c(%rip) # 0x1d8319f 22: 00 23: 74 15 je 0x3a 25: 48 89 df mov %rbx,%rdi 28: 57 push %rdi 29: 9d popfq * 2a: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) <-- trapping instruction 2f: eb b2 jmp 0xffffffe3 31: e8 fb eb e6 f8 callq 0xf8e6ec31 36: eb c0 jmp 0xfffffff8 38: 0f 0b ud2 3a: 0f 0b ud2 3c: 48 rex.W 3d: c7 .byte 0xc7 3e: c7 (bad) 3f: 88 .byte 0x88