BUG: soft lockup in sys_sendmmsg

Status: auto-obsoleted due to no activity on 2024/08/24 08:55
Reported-by: syzbot+13394bd4a3b8220b4c98@syzkaller.appspotmail.com
First crash: 796d, last: 796d
▶ ▼ Similar bugs (17)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 BUG: soft lockup in sys_sendmmsg 1 2 1126d 1155d 0/3 auto-obsoleted due to no activity on 2023/10/08 22:57
android-6-1 BUG: soft lockup in sys_sendmmsg 1 1 1008d 1008d 0/2 auto-obsoleted due to no activity on 2024/01/25 01:21
upstream INFO: rcu detected stall in sys_sendmmsg (7) prio:high net mm 1 143 2d16h 607d 0/29 upstream: reported on 2024/11/30 18:05
android-5-10 BUG: soft lockup in sys_sendmmsg 1 2 711d 711d 0/2 auto-obsoleted due to no activity on 2024/11/17 00:13
android-5-10 BUG: soft lockup in sys_sendmmsg (2) 1 syz error 19 207d 585d 0/2 premoderation: reported syz repro on 2024/12/23 13:44
upstream INFO: rcu detected stall in sys_sendmmsg (6) mm 1 3 961d 1008d 0/29 auto-obsoleted due to no activity on 2024/03/11 17:33
linux-6.1 INFO: rcu detected stall in sys_sendmmsg 1 2 737d 783d 0/3 auto-obsoleted due to no activity on 2024/11/01 14:13
linux-6.1 INFO: rcu detected stall in sys_sendmmsg (3) 1 3 148d 245d 0/3 auto-obsoleted due to no activity on 2026/06/13 03:55
linux-5.15 INFO: rcu detected stall in sys_sendmmsg (4) origin:lts-only 1 syz, C inconclusive 7 211d 294d 0/3 upstream: reported C repro on 2025/10/10 06:08
linux-5.15 INFO: rcu detected stall in sys_sendmmsg 1 1 1213d 1213d 0/3 auto-obsoleted due to no activity on 2023/08/02 15:37
upstream INFO: rcu detected stall in sys_sendmmsg (3) kernel 1 3 1667d 1766d 0/29 closed as invalid on 2022/02/08 10:00
linux-5.15 INFO: rcu detected stall in sys_sendmmsg (2) 1 1 813d 813d 0/3 auto-obsoleted due to no activity on 2024/08/17 11:17
upstream INFO: rcu detected stall in sys_sendmmsg (5) net 1 3 1152d 1166d 0/29 auto-obsoleted due to no activity on 2023/09/03 00:09
linux-5.15 INFO: rcu detected stall in sys_sendmmsg (3) 1 16 455d 674d 0/3 auto-obsoleted due to no activity on 2025/08/10 13:38
linux-6.6 INFO: rcu detected stall in sys_sendmmsg 1 2 31d 31d 0/2 upstream: reported on 2026/06/30 08:33
linux-6.1 INFO: rcu detected stall in sys_sendmmsg (2) 1 1 434d 434d 0/3 auto-obsoleted due to no activity on 2025/08/31 10:43
upstream INFO: rcu detected stall in sys_sendmmsg (4) net 1 1 1465d 1465d 0/29 auto-obsoleted due to no activity on 2022/10/25 00:28

Sample crash report:
watchdog: BUG: soft lockup - CPU#1 stuck for 123s! [syz-executor.0:11606]
Modules linked in:
CPU: 1 PID: 11606 Comm: syz-executor.0 Not tainted 5.15.149-syzkaller-00055-g424f92bcbe8f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:434 [inline]
RIP: 0010:__pv_queued_spin_lock_slowpath+0x5ba/0xc40 kernel/locking/qspinlock.c:508
Code: 00 00 49 89 dc c6 03 00 48 8b 44 24 10 0f b6 04 10 84 c0 0f 85 48 01 00 00 48 8b 44 24 08 c6 00 01 bb 00 80 ff ff eb 06 f3 90 <ff> c3 74 5e 41 0f b6 44 15 00 84 c0 75 36 41 80 3f 00 75 ea 4c 89
RSP: 0018:ffffc900009e7460 EFLAGS: 00000206
RAX: 0000000000000000 RBX: 00000000ffffc128 RCX: ffffffff8154fa7f
RDX: dffffc0000000000 RSI: 0000000000000003 RDI: ffff88810c2bf5c8
RBP: ffffc900009e7550 R08: dffffc0000000000 R09: ffffed1021857eba
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881f7137ed4
R13: 1ffff11021857eb9 R14: 1ffff1103ee20001 R15: ffff88810c2bf5c8
FS:  00007fb7a61916c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020005240 CR3: 00000001128cd000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 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_hash_delete_elem+0xb1/0x2f0 net/core/sock_map.c:937
 bpf_prog_2c29ac5cdc6b1842+0x3a/0xbb0
 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_hash_delete_elem+0x274/0x2f0 net/core/sock_map.c:941
 bpf_prog_2c29ac5cdc6b1842+0x3a/0xbb0
 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
 ___sys_sendmsg+0x27b/0x2e0 net/socket.c:2487
 __sys_sendmmsg+0x2bf/0x530 net/socket.c:2571
 __do_sys_sendmmsg net/socket.c:2600 [inline]
 __se_sys_sendmmsg net/socket.c:2597 [inline]
 __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2597
 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: 0033:0x7fb7a741cee9
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:00007fb7a61910c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007fb7a754bf80 RCX: 00007fb7a741cee9
RDX: 0000000004000095 RSI: 0000000020005240 RDI: 0000000000000003
RBP: 00007fb7a746949e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fb7a754bf80 R15: 00007ffdbab6c058
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 11607 Comm: syz-executor.4 Not tainted 5.15.149-syzkaller-00055-g424f92bcbe8f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
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:ffffc90000c976c0 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 1ffff92000192edc RCX: 1ffffffff0d1aa9c
RDX: 0000000000000001 RSI: 0000000000000001 RDI: ffff8881f7037ed4
RBP: ffffc90000c97770 R08: dffffc0000000000 R09: ffffed103ee06fdb
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff8881f7037ed4 R14: 0000000000000001 R15: 1ffff92000192ee0
FS:  0000555555851480(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff68e6ad724 CR3: 0000000129f18000 CR4: 00000000003506b0
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_hash_delete_elem+0xb1/0x2f0 net/core/sock_map.c:937
 bpf_prog_2c29ac5cdc6b1842+0x3a/0xbb0
 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_lookup_entry fs/ext4/namei.c:1773 [inline]
 ext4_lookup+0x3f3/0xaa0 fs/ext4/namei.c:1839
 lookup_one_qstr_excl+0x143/0x290 fs/namei.c:1563
 filename_create+0x28e/0x530 fs/namei.c:3836
 do_symlinkat+0xf4/0x5a0 fs/namei.c:4448
 __do_sys_symlinkat fs/namei.c:4475 [inline]
 __se_sys_symlinkat fs/namei.c:4472 [inline]
 __x64_sys_symlinkat+0x99/0xb0 fs/namei.c:4472
 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: 0033:0x7ff68e628667
Code: 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 0a 01 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:00007ffea2d08698 EFLAGS: 00000202 ORIG_RAX: 000000000000010a
RAX: ffffffffffffffda RBX: 00007ffea2d08760 RCX: 00007ff68e628667
RDX: 00007ff68e67554a RSI: 00000000ffffff9c RDI: 00007ffea2d08760
RBP: 0000000000000001 R08: 0000000000000017 R09: 00007ffea2d083e7
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000001
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/26 08:46 android13-5.15-lts 424f92bcbe8f a10a183e .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 BUG: soft lockup in sys_sendmmsg
* Struck through repros no longer work on HEAD.