watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.3:18794] Modules linked in: irq event stamp: 4648621 hardirqs last enabled at (4648620): [] trace_hardirqs_on_thunk+0x1a/0x1c hardirqs last disabled at (4648621): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (100044): [] __do_softirq+0x678/0x980 kernel/softirq.c:318 softirqs last disabled at (100999): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (100999): [] irq_exit+0x215/0x260 kernel/softirq.c:412 CPU: 0 PID: 18794 Comm: syz-executor.3 Not tainted 4.19.197-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 48 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 4c 00 d9 01 00 74 15 48 89 df 57 9d <0f> 1f 44 00 00 eb b2 e8 0b bb e7 f8 eb c0 0f 0b 0f 0b 48 c7 c7 48 RSP: 0018:ffff8880ba007cb0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff13e3049 RBX: 0000000000000286 RCX: 1ffff110435c1d2f RDX: dffffc0000000000 RSI: ffff88821ae0e958 RDI: 0000000000000286 RBP: ffff8880969a0c28 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff8880969a0c28 R14: 0000000000000000 R15: 0000000000000000 FS: 00007feca1a9a700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007feca1a79718 CR3: 000000020ca7f000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: spin_unlock_irqrestore include/linux/spinlock.h:384 [inline] skb_dequeue+0x125/0x180 net/core/skbuff.c:2836 garp_queue_xmit net/802/garp.c:261 [inline] garp_join_timer+0xc3/0xf0 net/802/garp.c:413 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:qlink_free mm/kasan/quarantine.c:150 [inline] RIP: 0010:qlist_free_all+0xfc/0x140 mm/kasan/quarantine.c:166 Code: 50 08 48 8d 4a ff 83 e2 01 48 0f 45 c1 4c 8b 70 18 e9 40 ff ff ff e8 d3 44 cf ff 48 83 3d 03 23 59 08 00 74 38 4c 89 ff 57 9d <0f> 1f 44 00 00 4d 85 e4 75 9e 49 c7 45 08 00 00 00 00 49 c7 45 00 RSP: 0018:ffff888229c5f5f8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: ffff8882301ec840 RCX: 1ffff110435c1d25 RDX: 0000000000000000 RSI: ffff88821ae0e930 RDI: 0000000000000286 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88820c610880 R13: ffff888229c5f630 R14: ffff88823b843380 R15: 0000000000000286 quarantine_reduce+0x1a9/0x230 mm/kasan/quarantine.c:259 kasan_kmalloc+0xa2/0x160 mm/kasan/kasan.c:538 __do_kmalloc mm/slab.c:3727 [inline] __kmalloc_track_caller+0x155/0x3c0 mm/slab.c:3742 kstrdup+0x36/0x70 mm/util.c:56 kstrdup_const+0x53/0x80 mm/util.c:77 alloc_vfsmnt+0xb5/0x780 fs/namespace.c:188 clone_mnt+0x6c/0x11b0 fs/namespace.c:1001 copy_tree+0x3af/0xaf0 fs/namespace.c:1757 copy_mnt_ns+0x1c2/0xad0 fs/namespace.c:2897 create_new_namespaces+0xd6/0x7b0 kernel/nsproxy.c:75 copy_namespaces+0x325/0x3c0 kernel/nsproxy.c:165 copy_process.part.0+0x3a59/0x8260 kernel/fork.c:1915 copy_process kernel/fork.c:1709 [inline] _do_fork+0x22f/0xf30 kernel/fork.c:2218 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4665d9 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:00007feca1a9a188 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9 RDX: 9999999999999999 RSI: 0000000000000000 RDI: 000000000007a900 RBP: 00000000004bfcb9 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffc9ed4523f R14: 00007feca1a9a300 R15: 0000000000022000 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 826 Comm: kworker/u4:9 Not tainted 4.19.197-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: writeback wb_workfn (flush-8:0) RIP: 0010:csd_lock_wait kernel/smp.c:108 [inline] RIP: 0010:smp_call_function_single+0x1e0/0x420 kernel/smp.c:302 Code: 00 48 8b 4c 24 08 48 8b 54 24 10 48 8d 74 24 40 8b 7c 24 1c e8 a1 f9 ff ff 41 89 c5 eb 07 e8 87 03 0a 00 f3 90 44 8b 64 24 58 <31> ff 41 83 e4 01 44 89 e6 e8 e2 04 0a 00 45 85 e4 75 e1 e8 68 03 RSP: 0018:ffff88801af96ce0 EFLAGS: 00000293 RAX: ffff88801c992580 RBX: 1ffff110035f2da0 RCX: ffffffff81587c7e RDX: 0000000000000000 RSI: ffffffff81587c69 RDI: 0000000000000005 RBP: ffff88801af96da8 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000003 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c008c246e0 CR3: 000000009c0e8000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: smp_call_function_many+0x743/0x8d0 kernel/smp.c:434 flush_tlb_others arch/x86/include/asm/paravirt.h:309 [inline] flush_tlb_mm_range+0x179/0x320 arch/x86/mm/tlb.c:728 flush_tlb_page arch/x86/include/asm/tlbflush.h:576 [inline] ptep_clear_flush+0x123/0x160 mm/pgtable-generic.c:87 page_mkclean_one+0x425/0x860 mm/rmap.c:912 rmap_walk_file+0x539/0xb10 mm/rmap.c:1897 rmap_walk+0x105/0x190 mm/rmap.c:1915 page_mkclean+0x20f/0x2b0 mm/rmap.c:981 clear_page_dirty_for_io+0x305/0xee0 mm/page-writeback.c:2687 mpage_submit_page+0x80/0x250 fs/ext4/inode.c:2215 mpage_process_page_bufs+0x534/0x630 fs/ext4/inode.c:2345 mpage_prepare_extent_to_map+0x9a2/0xf10 fs/ext4/inode.c:2707 ext4_writepages+0x111d/0x37f0 fs/ext4/inode.c:2835 do_writepages+0xe5/0x290 mm/page-writeback.c:2344 __writeback_single_inode+0x10c/0x11d0 fs/fs-writeback.c:1380 writeback_sb_inodes+0x537/0xef0 fs/fs-writeback.c:1642 __writeback_inodes_wb+0xc6/0x280 fs/fs-writeback.c:1711 wb_writeback+0x841/0xcc0 fs/fs-writeback.c:1817 wb_check_old_data_flush fs/fs-writeback.c:1919 [inline] wb_do_writeback fs/fs-writeback.c:1972 [inline] wb_workfn+0x92b/0x1350 fs/fs-writeback.c:2001 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415