BUG: soft lockup in sys_mkdir

Status: auto-obsoleted due to no activity on 2024/08/15 15:43
Reported-by: syzbot+1eb84c475b812b2d14d3@syzkaller.appspotmail.com
First crash: 821d, last: 817d
▶ ▼ Similar bugs (13)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 INFO: rcu detected stall in sys_mkdir 1 1 593d 593d 0/3 auto-obsoleted due to no activity on 2025/04/06 10:37
linux-6.6 INFO: rcu detected stall in sys_mkdir (3) 1 1 41d 41d 0/2 upstream: reported on 2026/07/02 03:34
linux-6.1 INFO: rcu detected stall in sys_mkdir 1 1 527d 527d 0/3 auto-obsoleted due to no activity on 2025/06/11 20:27
linux-6.1 INFO: rcu detected stall in sys_mkdir (2) origin:lts-only 1 syz, C inconclusive 2 49d 233d 0/3 upstream: reported C repro on 2025/12/22 06:04
linux-5.15 INFO: rcu detected stall in sys_mkdir (3) 1 1 157d 157d 0/3 auto-obsoleted due to no activity on 2026/06/16 08:45
upstream INFO: rcu detected stall in sys_mkdir (7) ext4 1 1 1083d 1083d 0/29 auto-obsoleted due to no activity on 2023/10/24 07:40
linux-5.15 INFO: rcu detected stall in sys_mkdir (2) 1 1 327d 327d 0/3 auto-obsoleted due to no activity on 2025/12/28 08:27
linux-6.6 INFO: rcu detected stall in sys_mkdir 1 1 358d 358d 0/2 auto-obsoleted due to no activity on 2025/11/27 00:13
upstream INFO: rcu detected stall in sys_mkdir (6) ext4 1 2 1655d 1664d 0/29 closed as invalid on 2022/02/08 09:50
upstream INFO: rcu detected stall in sys_mkdir (9) prio:high mm 1 syz done error 7 11d 564d 0/29 upstream: reported syz repro on 2025/01/25 04:35
upstream INFO: rcu detected stall in sys_mkdir (8) fs 1 1 682d 682d 0/29 auto-obsoleted due to no activity on 2024/12/28 09:04
upstream INFO: rcu detected stall in sys_mkdir (5) tomoyo 1 1 1790d 1790d 0/29 auto-closed as invalid on 2021/12/15 23:48
linux-6.6 INFO: rcu detected stall in sys_mkdir (2) 1 1 251d 251d 0/2 auto-obsoleted due to no activity on 2026/03/14 17:07

Sample crash report:
watchdog: BUG: soft lockup - CPU#0 stuck for 246s! [syz-executor.3:311]
Modules linked in:
CPU: 0 PID: 311 Comm: syz-executor.3 Not tainted 5.15.149-syzkaller-00490-g5d96939590c0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
RIP: 0010:arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
RIP: 0010:kvm_wait+0x147/0x180 arch/x86/kernel/kvm.c:918
Code: 4c 89 e8 48 c1 e8 03 42 0f b6 04 20 84 c0 44 8b 74 24 1c 75 34 41 0f b6 45 00 44 38 f0 75 10 66 90 0f 00 2d 5b 03 f3 03 fb f4 <e9> 24 ff ff ff fb e9 1e ff ff ff 44 89 e9 80 e1 07 38 c1 7c a3 4c
RSP: 0018:ffffc90001917480 EFLAGS: 00000246
RAX: 0000000000000003 RBX: 1ffff92000322e94 RCX: ffffffff8154fa7f
RDX: dffffc0000000000 RSI: 0000000000000003 RDI: ffff888124711d28
RBP: ffffc90001917530 R08: dffffc0000000000 R09: ffffed10248e23a6
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff888124711d28 R14: 0000000000000003 R15: 1ffff92000322e98
FS:  000055555627b480(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f41173fc980 CR3: 00000001073c1000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 pv_wait arch/x86/include/asm/paravirt.h:597 [inline]
 pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline]
 __pv_queued_spin_lock_slowpath+0x6bc/0xc40 kernel/locking/qspinlock.c:508
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:585 [inline]
 queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:85 [inline]
 do_raw_spin_lock include/linux/spinlock.h:187 [inline]
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:136 [inline]
 _raw_spin_lock_bh+0x139/0x1b0 kernel/locking/spinlock.c:178
 __sock_map_delete net/core/sock_map.c:416 [inline]
 sock_map_delete_elem+0x99/0x130 net/core/sock_map.c:448
 bpf_prog_8a405b5ced52e191+0x42/0xf5c
 bpf_dispatcher_nop_func include/linux/bpf.h:785 [inline]
 __bpf_prog_run include/linux/filter.h:625 [inline]
 bpf_prog_run include/linux/filter.h:632 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:1883 [inline]
 bpf_trace_run2+0xec/0x210 kernel/trace/bpf_trace.c:1920
 __bpf_trace_kfree+0x6f/0x90 include/trace/events/kmem.h:118
 trace_kfree include/trace/events/kmem.h:118 [inline]
 kfree+0x1f3/0x220 mm/slub.c:4569
 sk_psock_free_link include/linux/skmsg.h:420 [inline]
 sock_map_del_link net/core/sock_map.c:160 [inline]
 sock_map_unref+0x352/0x4d0 net/core/sock_map.c:182
 __sock_map_delete net/core/sock_map.c:422 [inline]
 sock_map_delete_elem+0xc1/0x130 net/core/sock_map.c:448
 bpf_prog_8a405b5ced52e191+0x42/0xf5c
 bpf_dispatcher_nop_func include/linux/bpf.h:785 [inline]
 __bpf_prog_run include/linux/filter.h:625 [inline]
 bpf_prog_run include/linux/filter.h:632 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:1883 [inline]
 bpf_trace_run2+0xec/0x210 kernel/trace/bpf_trace.c:1920
 __bpf_trace_kfree+0x6f/0x90 include/trace/events/kmem.h:118
 trace_kfree include/trace/events/kmem.h:118 [inline]
 kfree+0x1f3/0x220 mm/slub.c:4569
 fscrypt_free_filename include/linux/fscrypt.h:320 [inline]
 ext4_fname_free_filename fs/ext4/ext4.h:2784 [inline]
 ext4_add_entry+0xe1a/0x12b0 fs/ext4/namei.c:2478
 ext4_mkdir+0x54f/0xce0 fs/ext4/namei.c:3032
 vfs_mkdir+0x3f6/0x610 fs/namei.c:4065
 do_mkdirat+0x1eb/0x450 fs/namei.c:4090
 __do_sys_mkdir fs/namei.c:4110 [inline]
 __se_sys_mkdir fs/namei.c:4108 [inline]
 __x64_sys_mkdir+0x6e/0x80 fs/namei.c:4108
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f41172f7a47
Code: 44 00 00 48 8d 50 ff 83 c1 01 48 21 d0 75 f4 01 cf 48 83 c6 08 4c 39 c6 75 d9 89 f8 c3 31 ff 89 f8 c3 90 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffce6be2ad8 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007ffce6be2ca2 RCX: 00007f41172f7a47
RDX: 00000000061b6d83 RSI: 00000000000001c0 RDI: 00007ffce6be2c90
RBP: f49998db0aa753ff R08: 0000000000000004 R09: 0000000000000001
R10: 00000000000007d8 R11: 0000000000000246 R12: 8421084210842109
R13: 00007ffce6be2ca2 R14: 00007f41173508e0 R15: 00000000061b6d83
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 316 Comm: syz-executor.0 Not tainted 5.15.149-syzkaller-00490-g5d96939590c0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
RIP: 0010:arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
RIP: 0010:kvm_wait+0x147/0x180 arch/x86/kernel/kvm.c:918
Code: 4c 89 e8 48 c1 e8 03 42 0f b6 04 20 84 c0 44 8b 74 24 1c 75 34 41 0f b6 45 00 44 38 f0 75 10 66 90 0f 00 2d 5b 03 f3 03 fb f4 <e9> 24 ff ff ff fb e9 1e ff ff ff 44 89 e9 80 e1 07 38 c1 7c a3 4c
RSP: 0018:ffffc900019574e0 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 1ffff9200032aea0 RCX: 1ffffffff0d1aa9c
RDX: 0000000000000001 RSI: 0000000000000001 RDI: ffff8881f7137ed4
RBP: ffffc90001957590 R08: dffffc0000000000 R09: ffffed103ee26fdb
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff8881f7137ed4 R14: 0000000000000001 R15: 1ffff9200032aea4
FS:  00007f57427d66c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e621000 CR3: 000000012059b000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 pv_wait arch/x86/include/asm/paravirt.h:597 [inline]
 pv_wait_node kernel/locking/qspinlock_paravirt.h:325 [inline]
 __pv_queued_spin_lock_slowpath+0x41b/0xc40 kernel/locking/qspinlock.c:473
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:585 [inline]
 queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:85 [inline]
 do_raw_spin_lock include/linux/spinlock.h:187 [inline]
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:136 [inline]
 _raw_spin_lock_bh+0x139/0x1b0 kernel/locking/spinlock.c:178
 __sock_map_delete net/core/sock_map.c:416 [inline]
 sock_map_delete_elem+0x99/0x130 net/core/sock_map.c:448
 bpf_prog_8a405b5ced52e191+0x42/0xf5c
 bpf_dispatcher_nop_func include/linux/bpf.h:785 [inline]
 __bpf_prog_run include/linux/filter.h:625 [inline]
 bpf_prog_run include/linux/filter.h:632 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:1883 [inline]
 bpf_trace_run2+0xec/0x210 kernel/trace/bpf_trace.c:1920
 __bpf_trace_kfree+0x6f/0x90 include/trace/events/kmem.h:118
 trace_kfree include/trace/events/kmem.h:118 [inline]
 kfree+0x1f3/0x220 mm/slub.c:4569
 context_destroy security/selinux/ss/context.h:177 [inline]
 security_compute_sid+0x1d7d/0x1f40 security/selinux/ss/services.c:1913
 security_transition_sid+0x7d/0x90 security/selinux/ss/services.c:1936
 socket_sockcreate_sid security/selinux/hooks.c:4677 [inline]
 selinux_socket_create+0x204/0x330 security/selinux/hooks.c:4711
 security_socket_create+0x77/0xb0 security/security.c:2215
 __sock_create+0xd6/0x760 net/socket.c:1441
 sock_create net/socket.c:1537 [inline]
 __sys_socketpair+0x29f/0x6e0 net/socket.c:1637
 __do_sys_socketpair net/socket.c:1690 [inline]
 __se_sys_socketpair net/socket.c:1687 [inline]
 __x64_sys_socketpair+0x9b/0xb0 net/socket.c:1687
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f5743a61ee9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f57427d60c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000035
RAX: ffffffffffffffda RBX: 00007f5743b90f80 RCX: 00007f5743a61ee9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f5743aae49e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f5743b90f80 R15: 00007ffe02f189c8
 </TASK>

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/17 15:41 android13-5.15-lts 5d96939590c0 a12e99e7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15-perf BUG: soft lockup in sys_mkdir
2024/05/12 23:46 android13-5.15-lts 5d96939590c0 9026e142 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 BUG: soft lockup in sys_mkdir
* Struck through repros no longer work on HEAD.