watchdog: BUG: soft lockup - CPU#1 stuck for 134s! [syz-executor4:4533] Modules linked in: irq event stamp: 75515458 hardirqs last enabled at (75515457): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (75515457): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (75515457): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (75515457): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (75515457): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (75515458): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (2990400): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (2990307): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (2990307): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 1 PID: 4533 Comm: syz-executor4 Not tainted 4.17.0-rc6+ #29 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:783 [inline] RIP: 0010:lock_acquire+0x257/0x520 kernel/locking/lockdep.c:3923 RSP: 0018:ffff8801a038f8d8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 1ffff10034071f20 RCX: 0000000000000000 RDX: 1ffffffff11a31ad RSI: ffff8801a0384af8 RDI: 0000000000000286 RBP: ffff8801a038f9c8 R08: 0000000000001453 R09: 0000000000000003 R10: ffff8801a0384b70 R11: ffff8801a03842c0 R12: ffff8801a03842c0 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 FS: 0000000000ae4940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000930008 CR3: 00000001a02c7000 CR4: 00000000001406e0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144 spin_lock include/linux/spinlock.h:310 [inline] d_walk+0x261/0xc80 fs/dcache.c:1250 shrink_dcache_parent+0x179/0x230 fs/dcache.c:1486 vfs_rmdir+0x202/0x470 fs/namei.c:3850 do_rmdir+0x523/0x610 fs/namei.c:3911 __do_sys_rmdir fs/namei.c:3929 [inline] __se_sys_rmdir fs/namei.c:3927 [inline] __x64_sys_rmdir+0x36/0x40 fs/namei.c:3927 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455777 RSP: 002b:00007ffd08fa7818 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffd08fa95c0 RDI: 00007ffd08fa95c0 RBP: 00007ffd08fa95c0 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000006 R11: 0000000000000206 R12: 0000000000ae5940 R13: 0000000000000000 R14: 00000000000002e7 R15: 0000000000025477 Code: 00 00 00 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 5e 02 00 00 48 83 3d 80 74 74 07 00 0f 84 c8 01 00 00 48 8b bd 20 ff ff ff 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 01 c3 48 c7 03 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4535 Comm: syz-executor6 Not tainted 4.17.0-rc6+ #29 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__sanitizer_cov_trace_const_cmp4+0xd/0x20 kernel/kcov.c:187 RSP: 0018:ffff88019f1378f8 EFLAGS: 00000206 RAX: 0000000000000400 RBX: 1ffff10033e26f24 RCX: ffffffff815e0fd1 RDX: 0000000000000400 RSI: 0000000000000000 RDI: 0000000000000005 RBP: ffff88019f1378f8 R08: ffffed003934b7ad R09: ffffed003934b7ac R10: ffffed003934b7ac R11: ffff8801c9a5bd63 R12: ffff88019f137c10 R13: ffff8801c9a5bce0 R14: ffff88019f137c18 R15: ffff88019f1379c0 FS: 0000000001ec1940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f26a5486db8 CR3: 000000019f024000 CR4: 00000000001406f0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: select_collect+0xe4/0x5f0 fs/dcache.c:1450 d_walk+0x3c3/0xc80 fs/dcache.c:1276 shrink_dcache_parent+0x179/0x230 fs/dcache.c:1486 vfs_rmdir+0x202/0x470 fs/namei.c:3850 do_rmdir+0x523/0x610 fs/namei.c:3911 __do_sys_rmdir fs/namei.c:3929 [inline] __se_sys_rmdir fs/namei.c:3927 [inline] __x64_sys_rmdir+0x36/0x40 fs/namei.c:3927 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455777 RSP: 002b:00007ffcdc8ba6c8 EFLAGS: 00000202 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffcdc8bc470 RDI: 00007ffcdc8bc470 RBP: 00007ffcdc8bc470 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000006 R11: 0000000000000202 R12: 0000000001ec2940 R13: 0000000000000000 R14: 00000000000002ea R15: 0000000000025475 Code: b7 d6 0f b7 f7 bf 03 00 00 00 48 89 e5 48 8b 4d 08 e8 88 fe ff ff 5d c3 66 0f 1f 44 00 00 55 89 f2 89 fe bf 05 00 00 00 48 89 e5 <48> 8b 4d 08 e8 6a fe ff ff 5d c3 0f 1f 84 00 00 00 00 00 55 48