syzbot


BUG: soft lockup in sys_sendmmsg

Status: auto-obsoleted due to no activity on 2023/10/08 22:57
Reported-by: syzbot+ba2b722fc35aab8d1041@syzkaller.appspotmail.com
First crash: 411d, last: 383d
Similar bugs (11)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-5-15 BUG: soft lockup in sys_sendmmsg 1 52d 52d 0/2 premoderation: reported on 2024/05/26 08:47
android-6-1 BUG: soft lockup in sys_sendmmsg 1 264d 264d 0/2 auto-obsoleted due to no activity on 2024/01/25 01:21
upstream INFO: rcu detected stall in sys_sendmmsg (6) mm net 3 218d 264d 0/27 auto-obsoleted due to no activity on 2024/03/11 17:33
linux-6.1 INFO: rcu detected stall in sys_sendmmsg 1 39d 39d 0/3 upstream: reported on 2024/06/08 04:23
linux-5.15 INFO: rcu detected stall in sys_sendmmsg 1 470d 470d 0/3 auto-obsoleted due to no activity on 2023/08/02 15:37
upstream INFO: rcu detected stall in sys_sendmmsg (3) kernel 3 923d 1023d 0/27 closed as invalid on 2022/02/08 10:00
linux-5.15 INFO: rcu detected stall in sys_sendmmsg (2) 1 69d 69d 0/3 upstream: reported on 2024/05/09 11:17
upstream INFO: rcu detected stall in sys_sendmmsg (5) net 3 408d 422d 0/27 auto-obsoleted due to no activity on 2023/09/03 00:09
upstream INFO: rcu detected stall in sys_sendmmsg (4) net 1 721d 721d 0/27 auto-obsoleted due to no activity on 2022/10/25 00:28
upstream INFO: rcu detected stall in sys_sendmmsg (2) kernel 2 1688d 1689d 0/27 closed as invalid on 2019/12/04 14:14
upstream INFO: rcu detected stall in sys_sendmmsg net 2 1772d 1773d 13/27 fixed on 2019/10/09 10:54

Sample crash report:
watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [syz-executor.4:8952]
Modules linked in:
irq event stamp: 4615
hardirqs last  enabled at (4614): [<ffff8000120fb1c0>] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:84 [inline]
hardirqs last  enabled at (4614): [<ffff8000120fb1c0>] exit_to_kernel_mode+0xe8/0x118 arch/arm64/kernel/entry-common.c:94
hardirqs last disabled at (4615): [<ffff8000120f8e9c>] __el1_irq arch/arm64/kernel/entry-common.c:468 [inline]
hardirqs last disabled at (4615): [<ffff8000120f8e9c>] el1_interrupt+0x24/0x68 arch/arm64/kernel/entry-common.c:486
softirqs last  enabled at (210): [<ffff800010809308>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (220): [<ffff800010f10808>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
CPU: 1 PID: 8952 Comm: syz-executor.4 Not tainted 6.1.31-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __sanitizer_cov_trace_pc+0x80/0x8c kernel/kcov.c:225
lr : __list_del_entry include/linux/list.h:137 [inline]
lr : list_move_tail include/linux/list.h:229 [inline]
lr : fq_pie_qdisc_dequeue+0x290/0x8ac net/sched/sch_fq_pie.c:248
sp : ffff80001fba6830
x29: ffff80001fba68b0 x28: ffff000131c21010 x27: ffff0000dabf1ae8
x26: ffff0000dabf1af0 x25: dfff800000000000 x24: ffff0000dabf1ae0
x23: ffff000131c21000 x22: 0000000000000040 x21: 1fffe00026384200
x20: 0000000000000000 x19: 0000000000000000 x18: ffff80001fba6500
x17: ffff800010f0d250 x16: ffff8000084fa384 x15: 0000000000000000
x14: 0000000000000002 x13: 0000000000000001 x12: 0000000000040000
x11: 000000000003ffff x10: ffff800023b8b000 x9 : ffff80001071078c
x8 : 0000000000040000 x7 : ffff80000840686c x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000
x2 : ffff000131c21010 x1 : 0000000000000000 x0 : 0000000000000001
Call trace:
 __sanitizer_cov_trace_pc+0x80/0x8c kernel/kcov.c:223
 dequeue_skb net/sched/sch_generic.c:292 [inline]
 qdisc_restart net/sched/sch_generic.c:397 [inline]
 __qdisc_run+0x204/0x239c net/sched/sch_generic.c:415
 __dev_xmit_skb net/core/dev.c:3885 [inline]
 __dev_queue_xmit+0xe14/0x38d8 net/core/dev.c:4227
 dev_queue_xmit include/linux/netdevice.h:3018 [inline]
 neigh_connected_output+0x2f8/0x38c net/core/neighbour.c:1612
 neigh_output include/net/neighbour.h:546 [inline]
 ip6_finish_output2+0xdb4/0x1a98 net/ipv6/ip6_output.c:134
 ip6_fragment+0x1b7c/0x2a88 net/ipv6/ip6_output.c:946
 __ip6_finish_output net/ipv6/ip6_output.c:193 [inline]
 ip6_finish_output+0x518/0x8c8 net/ipv6/ip6_output.c:206
 NF_HOOK_COND include/linux/netfilter.h:291 [inline]
 ip6_output+0x270/0x594 net/ipv6/ip6_output.c:227
 dst_output include/net/dst.h:444 [inline]
 ip6_local_out+0x120/0x160 net/ipv6/output_core.c:161
 ip6_send_skb+0x118/0x428 net/ipv6/ip6_output.c:1989
 udp_v6_send_skb+0x9fc/0x1780 net/ipv6/udp.c:1292
 udpv6_sendmsg+0x19c4/0x28a4 net/ipv6/udp.c:1586
 inet6_sendmsg+0xb4/0xd8 net/ipv6/af_inet6.c:667
 sock_sendmsg_nosec net/socket.c:716 [inline]
 sock_sendmsg net/socket.c:736 [inline]
 ____sys_sendmsg+0x558/0x844 net/socket.c:2482
 ___sys_sendmsg net/socket.c:2536 [inline]
 __sys_sendmmsg+0x318/0x7d8 net/socket.c:2622
 __do_sys_sendmmsg net/socket.c:2651 [inline]
 __se_sys_sendmmsg net/socket.c:2648 [inline]
 __arm64_sys_sendmmsg+0xa0/0xbc net/socket.c:2648
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/06/02 02:57 linux-6.1.y d2869ace6eeb a4ae4f42 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in sys_sendmmsg
2023/06/30 22:56 linux-6.1.y a1c449d00ff8 af3053d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_sendmmsg
* Struck through repros no longer work on HEAD.