watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor4:4591] Modules linked in: irq event stamp: 12660822 hardirqs last enabled at (12660821): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (12660821): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (12660821): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (12660821): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (12660821): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (12660822): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (2640722): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (2640641): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (2640641): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4591 Comm: syz-executor4 Not tainted 4.17.0-rc4+ #14 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:d_walk+0x2c7/0xc80 fs/dcache.c:1263 RSP: 0018:ffff88019f0e79f8 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffffed0033e1cf52 RBX: 0000000000000000 RCX: ffffffff81c693a8 RDX: 0000000000000000 RSI: ffffffff81c693dd RDI: 0000000000000005 RBP: ffff88019f0e7b78 R08: ffff88019f0da000 R09: ffffed003936d9d8 R10: ffffed003936d9d8 R11: ffff8801c9b6cec3 R12: 0000000000004776 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88019f0e7b50 FS: 000000000146a940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000001473978 CR3: 000000019f6d0000 CR4: 00000000001406f0 DR0: 00000000200001c0 DR1: 00000000200001c0 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: 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:00007fff2d219bb8 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007fff2d21b960 RDI: 00007fff2d21b960 RBP: 00007fff2d21b960 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 000000000146b940 R13: 0000000000000000 R14: 000000000000061e R15: 0000000000045023 Code: 01 0f 84 90 04 00 00 c6 85 97 fe ff ff 01 48 8b 85 b8 fe ff ff 48 89 85 a8 fe ff ff e8 b3 99 b2 ff 48 8b 85 c8 fe ff ff c6 00 04 <48> 8b 85 a8 fe ff ff 4c 8d a0 00 01 00 00 4c 89 e0 48 c1 e8 03 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4590 Comm: syz-executor0 Not tainted 4.17.0-rc4+ #14 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:perf_trace_lock+0xa/0x900 include/trace/events/lock.h:39 RSP: 0018:ffff8801c5a1f8b0 EFLAGS: 00000086 RAX: ffffffff815beb00 RBX: 1ffff10038b43f1c RCX: ffffffff81c69cfc RDX: dffffc0000000000 RSI: ffffffff88d8e320 RDI: ffffffff88d77060 RBP: ffff8801c5a1f9e8 R08: 0000000000000000 R09: ffffed003b5e46c2 R10: ffffed003b5e46c2 R11: ffff8801daf23613 R12: ffff8801c5a1f9c0 R13: ffffffff88d8e320 R14: dffffc0000000000 R15: ffff88019ae1e128 FS: 0000000001dbf940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffff7e10d8c CR3: 00000001d05af000 CR4: 00000000001406e0 DR0: 0000000020000080 DR1: 0000000020000080 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: rcu_lock_release include/linux/rcupdate.h:251 [inline] rcu_read_unlock include/linux/rcupdate.h:688 [inline] d_walk+0x716/0xc80 fs/dcache.c:1327 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:00007ffff7e11498 EFLAGS: 00000202 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007ffff7e13240 RDI: 00007ffff7e13240 RBP: 00007ffff7e13240 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000202 R12: 0000000001dc0940 R13: 0000000000000000 R14: 000000000000055f R15: 0000000000045096 Code: ff 4c 89 e7 e8 58 f9 59 00 48 8b 95 70 fe ff ff 4c 8d 45 d8 e9 ff fb ff ff 0f 1f 84 00 00 00 00 00 48 ba 00 00 00 00 00 fc ff df <55> 49 89 f0 48 89 e5 41 57 49 89 ff 41 56 41 55 41 54 4c 8d 65