BUG: soft lockup in sys_sendmmsg (2)

Status: premoderation: reported syz repro on 2024/12/23 13:44
Reported-by: syzbot+78021c997ebae83abe5b@syzkaller.appspotmail.com
First crash: 634d, last: 6d02h
Fix bisection: failed (error log, bisect log)
  
▶ ▼ 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 1176d 1205d 0/3 auto-obsoleted due to no activity on 2023/10/08 22:57
android-5-15 BUG: soft lockup in sys_sendmmsg 1 1 845d 845d 0/2 auto-obsoleted due to no activity on 2024/08/24 08:55
android-6-1 BUG: soft lockup in sys_sendmmsg 1 1 1058d 1058d 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 mm net 1 147 20d 657d 0/29 upstream: reported on 2024/11/30 18:05
android-5-10 BUG: soft lockup in sys_sendmmsg 1 2 761d 761d 0/2 auto-obsoleted due to no activity on 2024/11/17 00:13
upstream INFO: rcu detected stall in sys_sendmmsg (6) mm 1 3 1011d 1058d 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 786d 833d 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 198d 294d 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 261d 344d 0/3 auto-obsoleted due to no activity on 2026/08/10 08:45
linux-5.15 INFO: rcu detected stall in sys_sendmmsg 1 1 1263d 1263d 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 1716d 1816d 0/29 closed as invalid on 2022/02/08 10:00
linux-5.15 INFO: rcu detected stall in sys_sendmmsg (2) 1 1 862d 862d 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 1202d 1215d 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 504d 724d 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 3 7d17h 80d 0/2 upstream: reported on 2026/06/30 08:33
linux-6.1 INFO: rcu detected stall in sys_sendmmsg (2) 1 1 483d 483d 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 1515d 1515d 0/29 auto-obsoleted due to no activity on 2022/10/25 00:28
▶ ▼ Last patch testing requests (6)
Created Duration User Patch Repo Result
2026/07/01 20:25 34m retest repro android13-5.10-lts log
2026/04/15 06:03 9m retest repro android13-5.10-lts report log
2026/01/26 22:03 9m retest repro android13-5.10-lts report log
2025/11/17 20:25 18m retest repro android13-5.10-lts report log
2025/09/08 12:20 10m retest repro android13-5.10-lts report log
2025/06/19 13:01 8m retest repro android13-5.10-lts report log

Sample crash report:
watchdog: BUG: soft lockup - CPU#0 stuck for 123s! [syz.6.28:447]
Modules linked in:
CPU: 0 PID: 447 Comm: syz.6.28 Not tainted 5.10.237-syzkaller-00010-gcf6ed0f1511d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:native_restore_fl arch/x86/include/asm/irqflags.h:41 [inline]
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/irqflags.h:84 [inline]
RIP: 0010:kvm_wait+0xc2/0x120 arch/x86/kernel/kvm.c:926
Code: 38 f0 75 26 41 f7 c4 00 02 00 00 75 0f 0f 1f 44 00 00 0f 00 2d ff 9d 98 03 f4 eb 0e 0f 1f 44 00 00 0f 00 2d f0 9d 98 03 fb f4 <4c> 89 64 24 18 ff 74 24 18 9d 48 c7 44 24 20 0e 36 e0 45 4b c7 04
RSP: 0018:ffffc900010f7580 EFLAGS: 00000246
RAX: 0000000000000003 RBX: ffff888112891488 RCX: ffffffff814b15ba
RDX: 0000000000000001 RSI: 0000000000000003 RDI: ffff888112891488
RBP: ffffc900010f7630 R08: dffffc0000000000 R09: ffffed1022512292
R10: ffffed1022512292 R11: 1ffff11022512291 R12: 0000000000000246
R13: 1ffff11022512291 R14: dffffc0000000000 R15: 1ffff9200021eeb4
FS:  00007f86679a46c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000001f000 CR3: 0000000111067000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 pv_wait arch/x86/include/asm/paravirt.h:564 [inline]
 pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline]
 __pv_queued_spin_lock_slowpath+0x714/0xb70 kernel/locking/qspinlock.c:508
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:554 [inline]
 queued_spin_lock_slowpath+0x47/0x50 arch/x86/include/asm/qspinlock.h:51
 queued_spin_lock include/asm-generic/qspinlock.h:85 [inline]
 do_raw_spin_lock include/linux/spinlock.h:183 [inline]
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:136 [inline]
 _raw_spin_lock_bh+0xd8/0xe0 kernel/locking/spinlock.c:175
 spin_lock_bh include/linux/spinlock.h:359 [inline]
 lock_sock_nested+0x92/0x290 net/core/sock.c:3117
 lock_sock include/net/sock.h:1648 [inline]
 tipc_sendstream+0x47/0x70 net/tipc/socket.c:1540
 sock_sendmsg_nosec net/socket.c:652 [inline]
 __sock_sendmsg net/socket.c:664 [inline]
 ____sys_sendmsg+0x5a2/0x8c0 net/socket.c:2376
 ___sys_sendmsg+0x1f0/0x260 net/socket.c:2430
 __sys_sendmmsg+0x273/0x450 net/socket.c:2516
 __do_sys_sendmmsg net/socket.c:2545 [inline]
 __se_sys_sendmmsg net/socket.c:2542 [inline]
 __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2542
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f8667f54969
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f86679a4038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f866817c080 RCX: 00007f8667f54969
RDX: 0000000000000007 RSI: 0000200000002740 RDI: 0000000000000003
RBP: 00007f8667fd6ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000200000d1 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f866817c080 R15: 00007ffc4f313a38
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 410 Comm: syz.6.28 Not tainted 5.10.237-syzkaller-00010-gcf6ed0f1511d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:arch_atomic_fetch_add arch/x86/include/asm/atomic.h:184 [inline]
RIP: 0010:atomic_fetch_add_relaxed include/asm-generic/atomic-instrumented.h:143 [inline]
RIP: 0010:__refcount_add include/linux/refcount.h:193 [inline]
RIP: 0010:__refcount_inc include/linux/refcount.h:250 [inline]
RIP: 0010:refcount_inc include/linux/refcount.h:267 [inline]
RIP: 0010:sock_hold include/net/sock.h:732 [inline]
RIP: 0010:tipc_sk_lookup+0x4dd/0x5f0 net/tipc/socket.c:2999
Code: 20 84 c0 0f 85 0e 01 00 00 48 8b 44 24 08 0f b7 00 49 29 c5 74 67 49 8d 9d 80 00 00 00 48 89 df be 04 00 00 00 e8 f3 87 43 fd <41> be 01 00 00 00 f0 45 0f c1 b5 80 00 00 00 31 ff 44 89 f6 e8 ca
RSP: 0018:ffffc90000e769c0 EFLAGS: 00000256
RAX: 0000000000000301 RBX: ffff888112891480 RCX: ffffffff8459fc3d
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff888112891480
RBP: ffffc90000e76ab0 R08: dffffc0000000000 R09: ffffed1022512291
R10: ffffed1022512291 R11: 1ffff11022512290 R12: dffffc0000000000
R13: ffff888112891400 R14: 0000000000000000 R15: fffffffffffffc18
FS:  00007f86679c56c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002000 CR3: 0000000111067000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 tipc_sk_rcv+0x3eb/0x1ef0 net/tipc/socket.c:2488
 tipc_node_xmit+0x256/0xcd0 net/tipc/node.c:1674
 tipc_node_xmit_skb+0xe9/0x130 net/tipc/node.c:1739
 tipc_sk_rcv+0x1d77/0x1ef0 net/tipc/socket.c:2518
 tipc_node_xmit+0x256/0xcd0 net/tipc/node.c:1674
 tipc_sk_push_backlog net/tipc/socket.c:1306 [inline]
 tipc_sk_filter_connect net/tipc/socket.c:2253 [inline]
 tipc_sk_filter_rcv+0x1581/0x3850 net/tipc/socket.c:2362
 tipc_sk_enqueue net/tipc/socket.c:2442 [inline]
 tipc_sk_rcv+0x7cc/0x1ef0 net/tipc/socket.c:2493
 tipc_node_xmit+0x256/0xcd0 net/tipc/node.c:1674
 tipc_node_xmit_skb net/tipc/node.c:1739 [inline]
 tipc_node_distr_xmit+0x292/0x390 net/tipc/node.c:1754
 tipc_sk_backlog_rcv+0x16f/0x1f0 net/tipc/socket.c:2410
 sk_backlog_rcv include/net/sock.h:1052 [inline]
 __release_sock+0x146/0x360 net/core/sock.c:2583
 release_sock+0x60/0x1b0 net/core/sock.c:3134
 tipc_release+0xbd4/0x1490 net/tipc/socket.c:639
 __sock_release net/socket.c:597 [inline]
 sock_close+0xe0/0x270 net/socket.c:1286
 __fput+0x2fb/0x770 fs/file_table.c:281
 ____fput+0x15/0x20 fs/file_table.c:314
 task_work_run+0x127/0x190 kernel/task_work.c:189
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop+0xcb/0xe0 kernel/entry/common.c:172
 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline]
 syscall_exit_to_user_mode+0x68/0x90 kernel/entry/common.c:274
 do_syscall_64+0x3d/0x40 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f8667f54969
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f86679c5038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: 00000000000203a0 RBX: 00007f866817bfa0 RCX: 00007f8667f54969
RDX: 0000000000000000 RSI: 00002000000003c0 RDI: 0000000000000003
RBP: 00007f8667fd6ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f866817bfa0 R15: 00007ffc4f313a38

Crashes (20):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/06/01 23:43 android13-5.10-lts cf6ed0f1511d 3d2f584d .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-5-10 BUG: soft lockup in sys_sendmmsg
2026/09/13 06:24 android13-5.10-lts 452567d1985b 70a60e12 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 BUG: soft lockup in sys_sendmmsg
2026/01/05 02:13 android13-5.10-lts e253c52bbdfc d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 BUG: soft lockup in sys_sendmmsg
2025/11/02 13:07 android13-5.10-lts ab3e1c0dd1ff 2c50b6a9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 BUG: soft lockup in sys_sendmmsg
2025/08/25 06:20 android13-5.10-lts 1154f779f3f3 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 BUG: soft lockup in sys_sendmmsg
2025/07/24 20:24 android13-5.10-lts ad9a98ef27a4 65d60d73 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 BUG: soft lockup in sys_sendmmsg
2025/05/23 07:01 android13-5.10-lts 7e2543346ff7 fa44301a .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 BUG: soft lockup in sys_sendmmsg
2025/05/23 06:45 android13-5.10-lts 7e2543346ff7 fa44301a .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 BUG: soft lockup in sys_sendmmsg
2025/05/23 06:41 android13-5.10-lts 7e2543346ff7 fa44301a .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 BUG: soft lockup in sys_sendmmsg
2025/05/18 07:45 android13-5.10-lts 7e2543346ff7 f41472b0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 BUG: soft lockup in sys_sendmmsg
2025/05/09 19:18 android13-5.10-lts 7e2543346ff7 77908e5f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 BUG: soft lockup in sys_sendmmsg
2025/05/09 19:18 android13-5.10-lts 7e2543346ff7 77908e5f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 BUG: soft lockup in sys_sendmmsg
2025/04/10 12:17 android13-5.10-lts e0b88ee5f09c 988b336c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 BUG: soft lockup in sys_sendmmsg
2025/04/06 14:50 android13-5.10-lts 094fc3778d6b 1c65791e .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 BUG: soft lockup in sys_sendmmsg
2025/01/16 18:46 android13-5.10-lts fbe98d68b6b3 f9e07a6e .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 BUG: soft lockup in sys_sendmmsg
2024/12/23 14:00 android13-5.10-lts 4055d754db6f b4fbdbd4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 BUG: soft lockup in sys_sendmmsg
2024/12/23 13:49 android13-5.10-lts 4055d754db6f b4fbdbd4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 BUG: soft lockup in sys_sendmmsg
2024/12/23 13:47 android13-5.10-lts 4055d754db6f b4fbdbd4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 BUG: soft lockup in sys_sendmmsg
2024/12/23 13:45 android13-5.10-lts 4055d754db6f b4fbdbd4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 BUG: soft lockup in sys_sendmmsg
2024/12/23 13:43 android13-5.10-lts 4055d754db6f b4fbdbd4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 BUG: soft lockup in sys_sendmmsg
* Struck through repros no longer work on HEAD.