BUG: soft lockup in shrink_dcache_parent

Status: closed as invalid on 2018/05/19 09:28
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+9c645dde8f8deb891497@syzkaller.appspotmail.com
First crash: 3006d, last: 3005d
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream BUG: soft lockup in shrink_dcache_parent (2) fs 1 7 2982d 2989d 10/29 fixed on 2018/09/10 14:49

Sample crash report:
watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor107:4487]
Modules linked in:
irq event stamp: 19141612
hardirqs last  enabled at (19141611): [<ffffffff81c6992f>] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline]
hardirqs last  enabled at (19141611): [<ffffffff81c6992f>] read_seqcount_begin include/linux/seqlock.h:164 [inline]
hardirqs last  enabled at (19141611): [<ffffffff81c6992f>] read_seqbegin include/linux/seqlock.h:433 [inline]
hardirqs last  enabled at (19141611): [<ffffffff81c6992f>] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline]
hardirqs last  enabled at (19141611): [<ffffffff81c6992f>] d_walk+0x80f/0xc80 fs/dcache.c:1248
hardirqs last disabled at (19141612): [<ffffffff87800905>] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625
softirqs last  enabled at (19140862): [<ffffffff87a00778>] __do_softirq+0x778/0xaf5 kernel/softirq.c:311
softirqs last disabled at (19140855): [<ffffffff81475241>] invoke_softirq kernel/softirq.c:365 [inline]
softirqs last disabled at (19140855): [<ffffffff81475241>] irq_exit+0x1d1/0x200 kernel/softirq.c:405
CPU: 0 PID: 4487 Comm: syz-executor107 Not tainted 4.17.0-rc4+ #14
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0xa/0x50 kernel/kcov.c:100
RSP: 0018:ffff8801adfaf9e8 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13
RAX: ffff8801ad894040 RBX: 0000000000000001 RCX: ffffffff81c69cfc
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffff8801adfafb78 R08: ffff8801ad894040 R09: ffffed003b5c46c2
R10: ffffed003b5c46c2 R11: ffff8801dae23613 R12: 00000000000002f6
R13: dffffc0000000000 R14: ffff8801a9ad4720 R15: ffff8801adfafb50
FS:  0000000001459880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000146a918 CR3: 00000001adc75000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
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: 0033:0x4411f7
RSP: 002b:00007ffc205be7b8 EFLAGS: 00000207 ORIG_RAX: 0000000000000054
RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00000000004411f7
RDX: 0000000000000000 RSI: 00000000006cd858 RDI: 00007ffc205bf8a0
RBP: 00007ffc205bf8a0 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000005 R11: 0000000000000207 R12: 000000000145a8a0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Code: 72 1b 49 83 c1 01 4a 89 7c 10 e0 4a 89 74 10 e8 4a 89 54 10 f0 4a 89 4c d8 20 4c 89 08 5d c3 66 90 55 65 48 8b 04 25 c0 ed 01 00 <65> 8b 15 af bf 88 7e 48 89 e5 81 e2 00 01 1f 00 48 8b 75 08 75 
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4486 Comm: syz-executor107 Not tainted 4.17.0-rc4+ #14
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0xa/0x50 kernel/kcov.c:100
RSP: 0018:ffff8801ade479e8 EFLAGS: 00000293
RAX: ffff8801ad88a000 RBX: ffff8801a9adef30 RCX: ffffffff81c693a8
RDX: 0000000000000000 RSI: ffffffff81c6943a RDI: 0000000000000005
RBP: ffff8801ade47b78 R08: ffff8801ad88a000 R09: ffffed0035356e20
R10: ffffed0035356e20 R11: ffff8801a9ab7103 R12: ffff8801a9ab7180
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8801ade47b50
FS:  0000000001459880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000146a918 CR3: 00000001add3d000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
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: 0033:0x4411f7
RSP: 002b:00007ffc205be7b8 EFLAGS: 00000207 ORIG_RAX: 0000000000000054
RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00000000004411f7
RDX: 0000000000000000 RSI: 00000000006cd858 RDI: 00007ffc205bf8a0
RBP: 00007ffc205bf8a0 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000005 R11: 0000000000000207 R12: 000000000145a8a0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Code: 72 1b 49 83 c1 01 4a 89 7c 10 e0 4a 89 74 10 e8 4a 89 54 10 f0 4a 89 4c d8 20 4c 89 08 5d c3 66 90 55 65 48 8b 04 25 c0 ed 01 00 <65> 8b 15 af bf 88 7e 48 89 e5 81 e2 00 01 1f 00 48 8b 75 08 75

Crashes (67):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/05/19 06:23 bpf-next 82f9e2d5dba6 849705db .config console log report syz C ci-upstream-bpf-next-kasan-gce
2018/05/18 20:42 upstream 2c71d338bef2 849705db .config console log report ci-upstream-kasan-gce-root
2018/05/18 20:38 upstream 2c71d338bef2 849705db .config console log report ci-upstream-kasan-gce-root
2018/05/19 01:20 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/19 01:12 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/19 01:04 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/19 00:54 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/19 00:41 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/19 00:34 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/19 00:31 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/19 00:23 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/19 00:13 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/19 00:08 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/18 23:53 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/18 23:47 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/18 23:14 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/18 23:12 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/18 23:10 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/18 21:50 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/18 21:33 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/18 21:30 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/18 21:06 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/18 20:58 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/18 20:56 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/18 20:54 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/18 20:51 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/18 20:47 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/18 20:47 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/18 20:30 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/18 20:28 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/18 20:28 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/18 20:27 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/18 20:11 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/18 20:01 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/18 19:50 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/18 19:28 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/18 19:27 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/18 19:20 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/18 18:33 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/18 18:32 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
2018/05/18 18:23 bpf-next 82f9e2d5dba6 849705db .config console log report ci-upstream-bpf-next-kasan-gce
* Struck through repros no longer work on HEAD.