BUG: soft lockup in sys_mount

Status: auto-obsoleted due to no activity on 2024/10/17 05:03
Bug presence: origin:lts
[Documentation on labels]
Reported-by: syzbot+7d61861826e68e126f1f@syzkaller.appspotmail.com
First crash: 831d, last: 750d
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (3)
Date Name Commit Repro Result
2024/04/19 lts (merge base) 6139f2a02fe0 C [report] BUG: soft lockup in sys_mount
2024/10/17 lts (merge base) 3a5928702e71 C Didn't crash
2024/04/19 upstream (ToT) 2668e3ae2ef3 C Didn't crash
▶ ▼ Similar bugs (7)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in sys_mount (8) prio:low overlayfs 1 C error 40 4d19h 331d 0/29 upstream: reported C repro on 2025/08/27 13:07
upstream BUG: soft lockup in sys_mount kernel 1 1 2210d 2209d 0/29 auto-closed as invalid on 2020/10/04 01:38
upstream INFO: rcu detected stall in sys_mount (6) ntfs 1 C inconclusive 82 987d 1761d 0/29 auto-obsoleted due to no activity on 2024/02/18 04:52
linux-5.15 INFO: rcu detected stall in sys_mount 1 2 589d 651d 0/3 auto-obsoleted due to no activity on 2025/03/22 20:11
upstream INFO: rcu detected stall in sys_mount (7) fs 1 C inconclusive done 41 577d 819d 0/29 auto-obsoleted due to no activity on 2025/03/30 13:11
linux-5.15 INFO: rcu detected stall in mount origin:lts-only 1 C error 5 61d 445d 0/3 upstream: reported C repro on 2025/05/05 20:18
linux-6.1 INFO: rcu detected stall in sys_mount origin:lts-only 1 C inconclusive 8 30d 587d 0/3 upstream: reported C repro on 2024/12/14 21:36
▶ ▼ Last patch testing requests (2)
Created Duration User Patch Repo Result
2024/07/29 08:00 12m retest repro android13-5.15-lts report log
2024/05/20 05:32 8m retest repro android13-5.15-lts report log

Sample crash report:
RBP: 0000000020000880 R08: 00007fbe3a324f00 R09: 0000000000010459
R10: 0000000000010459 R11: 0000000000000206 R12: 00000000200000c0
R13: 00007fbe3a324ec0 R14: 00000000000004e9 R15: 000000000000002c
 </TASK>
watchdog: BUG: soft lockup - CPU#1 stuck for 226s! [syz.4.13577:14314]
Modules linked in:
CPU: 1 PID: 14314 Comm: syz.4.13577 Not tainted 5.15.150-syzkaller-00330-g9044d25b8ff5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
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 4b 02 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:ffffc90000d86ca0 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 1ffff920001b0d98 RCX: 1ffffffff0d1aa9c
RDX: 0000000000000001 RSI: 0000000000000001 RDI: ffff8881f7138ad4
RBP: ffffc90000d86d50 R08: dffffc0000000000 R09: ffffed103ee2715b
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff8881f7138ad4 R14: 0000000000000001 R15: 1ffff920001b0d9c
FS:  00007fbe3a3256c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbe3b086de0 CR3: 000000010c593000 CR4: 00000000003526a0
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_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+0x42/0x318
 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:1880 [inline]
 bpf_trace_run2+0xec/0x210 kernel/trace/bpf_trace.c:1917
 __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
 key_user_lookup+0x1b9/0x470 security/keys/key.c:112
 key_alloc+0x125/0xe70 security/keys/key.c:251
 keyring_alloc+0x45/0xb0 security/keys/keyring.c:526
 allocate_master_key_users_keyring fs/crypto/keyring.c:328 [inline]
 add_new_master_key+0x280/0x5c0 fs/crypto/keyring.c:433
 do_add_master_key fs/crypto/keyring.c:506 [inline]
 add_master_key+0x469/0x920 fs/crypto/keyring.c:570
 fscrypt_add_test_dummy_key+0xe6/0x1f0 fs/crypto/keyring.c:794
 fscrypt_set_test_dummy_encryption+0x1d2/0x690 fs/crypto/policy.c:758
 ext4_set_test_dummy_encryption+0x137/0x220 fs/ext4/super.c:2075
 handle_mount_opt fs/ext4/super.c:2313 [inline]
 parse_options+0x11cb/0x2d20 fs/ext4/super.c:2454
 ext4_fill_super+0x2084/0x96e0 fs/ext4/super.c:4167
 mount_bdev+0x282/0x3b0 fs/super.c:1387
 ext4_mount+0x34/0x40 fs/ext4/super.c:6581
 legacy_get_tree+0xf1/0x190 fs/fs_context.c:611
 vfs_get_tree+0x88/0x290 fs/super.c:1517
 do_new_mount+0x2ba/0xb30 fs/namespace.c:3005
 path_mount+0x671/0x1070 fs/namespace.c:3335
 do_mount fs/namespace.c:3348 [inline]
 __do_sys_mount fs/namespace.c:3556 [inline]
 __se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3533
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3533
 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: 0033:0x7fbe3b0a52da
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 7e 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbe3a324e78 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fbe3a324f00 RCX: 00007fbe3b0a52da
RDX: 0000000020000880 RSI: 00000000200000c0 RDI: 00007fbe3a324ec0
RBP: 0000000020000880 R08: 00007fbe3a324f00 R09: 0000000000010459
R10: 0000000000010459 R11: 0000000000000206 R12: 00000000200000c0
R13: 00007fbe3a324ec0 R14: 00000000000004e9 R15: 000000000000002c
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 14275 Comm: syz.0.13564 Not tainted 5.15.150-syzkaller-00330-g9044d25b8ff5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
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 4b 02 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:ffffc90000bb7560 EFLAGS: 00000246
RAX: 0000000000000003 RBX: 1ffff92000176eb0 RCX: ffffffff8154fbbf
RDX: dffffc0000000000 RSI: 0000000000000003 RDI: ffff888122651128
RBP: ffffc90000bb7610 R08: dffffc0000000000 R09: ffffed10244ca226
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff888122651128 R14: 0000000000000003 R15: 1ffff92000176eb4
FS:  00007f7ba13316c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020001680 CR3: 000000011ffe2000 CR4: 00000000003526b0
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_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+0x42/0x318
 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:1880 [inline]
 bpf_trace_run2+0xec/0x210 kernel/trace/bpf_trace.c:1917
 __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+0x42/0x318
 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:1880 [inline]
 bpf_trace_run2+0xec/0x210 kernel/trace/bpf_trace.c:1917
 __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
 raw_ioctl+0x1992/0x3510
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0x114/0x190 fs/ioctl.c:860
 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:860
 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: 0033:0x7f7ba20af7db
Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00
RSP: 002b:00007f7ba132ef70 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f7ba20af7db
RDX: 00007f7ba1330000 RSI: 0000000080085502 RDI: 0000000000000003
RBP: 00007f7ba211eaa1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000020001680 R14: 00007f7ba223df60 R15: 00007fffea110b48
 </TASK>

Crashes (17):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/07/04 17:29 android13-5.15-lts 9044d25b8ff5 3f2748a3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 BUG: soft lockup in sys_mount
2024/06/06 01:49 android13-5.15-lts 79bd336c7a94 121701b6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 BUG: soft lockup in sys_mount
2024/06/05 19:52 android13-5.15-lts 79bd336c7a94 5aa1a7c9 .config console log report info ci2-android-5-15 BUG: soft lockup in sys_mount
2024/05/23 07:33 android13-5.15-lts 5d96939590c0 4d098039 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 BUG: soft lockup in sys_mount
2024/05/22 21:43 android13-5.15-lts 5d96939590c0 4d098039 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 BUG: soft lockup in sys_mount
2024/05/20 12:43 android13-5.15-lts 5d96939590c0 c0f1611a .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 BUG: soft lockup in sys_mount
2024/05/06 04:01 android13-5.15-lts 5d96939590c0 610f2a54 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 BUG: soft lockup in sys_mount
2024/05/05 09:23 android13-5.15-lts 5d96939590c0 610f2a54 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 BUG: soft lockup in sys_mount
2024/05/01 21:38 android13-5.15-lts 5d96939590c0 3ba885bc .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 BUG: soft lockup in sys_mount
2024/04/28 09:53 android13-5.15-lts 5d96939590c0 07b455f9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 BUG: soft lockup in sys_mount
2024/04/23 04:11 android13-5.15-lts ad06eaf051cd 36c961ad .config console log report info ci2-android-5-15 BUG: soft lockup in sys_mount
2024/04/19 05:17 android13-5.15-lts ad06eaf051cd af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 BUG: soft lockup in sys_mount
2024/04/18 02:31 android13-5.15-lts ad06eaf051cd acc528cb .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-15 BUG: soft lockup in sys_mount
2024/04/17 11:48 android13-5.15-lts ad06eaf051cd 18f6e127 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 BUG: soft lockup in sys_mount
2024/04/15 23:39 android13-5.15-lts ad06eaf051cd b9af7e61 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 BUG: soft lockup in sys_mount
2024/04/15 08:53 android13-5.15-lts 993bed180178 c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 BUG: soft lockup in sys_mount
2024/04/14 09:20 android13-5.15-lts 993bed180178 c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 BUG: soft lockup in sys_mount
* Struck through repros no longer work on HEAD.