BUG: soft lockup in tcp_tasklet_func

Status: auto-obsoleted due to no activity on 2024/09/27 22:34
Reported-by: syzbot+cf0d72b351d3594b767d@syzkaller.appspotmail.com
First crash: 777d, last: 777d
▶ ▼ Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-6-1 BUG: soft lockup in tcp_tasklet_func 1 1 413d 413d 0/2 auto-obsoleted due to no activity on 2025/09/26 12:22
android-6-1 BUG: soft lockup in tcp_tasklet_func (2) 1 1 295d 295d 0/2 auto-obsoleted due to no activity on 2026/01/22 11:08
linux-5.15 INFO: rcu detected stall in tcp_tasklet_func 1 1 18d 18d 0/3 upstream: reported on 2026/07/27 23:06

Sample crash report:
RBP: 00007ffd0220f418 R08: 0000000000000008 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000080000
R13: 000055ff7ef78b42 R14: 0000000000000001 R15: 000055ff7ef94160
 </TASK>
watchdog: BUG: soft lockup - CPU#0 stuck for 225s! [udevd:471]
Modules linked in:
CPU: 0 PID: 471 Comm: udevd Tainted: G        W         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:ffffc90000007b20 EFLAGS: 00000246
RAX: 0000000000000003 RBX: 1ffff92000000f68 RCX: ffffffff8154fbbf
RDX: dffffc0000000000 RSI: 0000000000000003 RDI: ffff8881184a8a48
RBP: ffffc90000007bd0 R08: dffffc0000000000 R09: ffffed102309514a
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff8881184a8a48 R14: 0000000000000003 R15: 1ffff92000000f6c
FS:  00007f926562dc80(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3ef5c97000 CR3: 000000010ed18000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 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 include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_lock+0x139/0x1b0 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:363 [inline]
 tcp_tsq_handler+0x24/0x150 net/ipv4/tcp_output.c:1026
 tcp_tasklet_func+0x436/0x4b0 net/ipv4/tcp_output.c:1060
 tasklet_action_common+0x22e/0x610 kernel/softirq.c:796
 tasklet_action+0x4c/0x60 kernel/softirq.c:821
 __do_softirq+0x26d/0x5bf kernel/softirq.c:565
 invoke_softirq kernel/softirq.c:425 [inline]
 __irq_exit_rcu+0x50/0xf0 kernel/softirq.c:648
 irq_exit_rcu+0x9/0x10 kernel/softirq.c:660
 sysvec_apic_timer_interrupt+0x9a/0xc0 arch/x86/kernel/apic/apic.c:1096
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:__inode_security_revalidate security/selinux/hooks.c:275 [inline]
RIP: 0010:inode_security_rcu security/selinux/hooks.c:298 [inline]
RIP: 0010:selinux_inode_permission+0x2b7/0x660 security/selinux/hooks.c:3205
Code: 31 ff 44 89 f6 e8 29 d7 36 ff 45 85 f6 74 47 48 83 c3 22 48 89 d8 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 fc 02 00 00 0f b6 1b <0f> b6 f3 bf 01 00 00 00 e8 fc d6 36 ff 83 7c 24 18 00 75 1f 80 fb
RSP: 0018:ffffc90000b67640 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffff8881107f93c0
RDX: ffff8881107f93c0 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000b67720 R08: ffffffff82396307 R09: ffffc90000b67680
R10: fffff5200016ced2 R11: dffffc0000000001 R12: ffff8881092ce608
R13: dffffc0000000000 R14: 0000000000000001 R15: 1ffff11021259cc1
 security_inode_permission+0xa0/0xf0 security/security.c:1329
 inode_permission+0xf8/0x460 fs/namei.c:534
 may_lookup fs/namei.c:1693 [inline]
 link_path_walk+0x2be/0xd90 fs/namei.c:2245
 path_openat+0x271/0x2f40 fs/namei.c:3738
 do_filp_open+0x21c/0x460 fs/namei.c:3769
 do_sys_openat2+0x13f/0x830 fs/open.c:1234
 do_sys_open fs/open.c:1250 [inline]
 __do_sys_openat fs/open.c:1266 [inline]
 __se_sys_openat fs/open.c:1261 [inline]
 __x64_sys_openat+0x243/0x290 fs/open.c:1261
 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: 0033:0x7f92657589a4
Code: 24 20 48 8d 44 24 30 48 89 44 24 28 64 8b 04 25 18 00 00 00 85 c0 75 2c 44 89 e2 48 89 ee bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 76 60 48 8b 15 55 a4 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffd0220f2e0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 00007f92657589a4
RDX: 0000000000080000 RSI: 00007ffd0220f418 RDI: 00000000ffffff9c
RBP: 00007ffd0220f418 R08: 0000000000000008 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000080000
R13: 000055ff7ef78b42 R14: 0000000000000001 R15: 000055ff7ef94160
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 14 Comm: rcu_preempt Tainted: G        W         5.15.150-syzkaller-00330-g9044d25b8ff5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:native_halt arch/x86/include/asm/irqflags.h:57 [inline]
RIP: 0010:halt arch/x86/include/asm/irqflags.h:98 [inline]
RIP: 0010:kvm_wait+0x117/0x180 arch/x86/kernel/kvm.c:912
Code: 48 c1 e8 03 42 0f b6 04 20 84 c0 44 8b 74 24 1c 75 53 41 0f b6 45 00 44 38 f0 0f 85 63 ff ff ff 66 90 0f 00 2d 7a 02 f3 03 f4 <e9> 54 ff ff ff fa 4c 89 e8 48 c1 e8 03 42 0f b6 04 20 84 c0 44 8b
RSP: 0018:ffffc900001cf8c0 EFLAGS: 00000046
RAX: 0000000000000003 RBX: 1ffff92000039f1c RCX: ffffffff8154fbbf
RDX: dffffc0000000000 RSI: 0000000000000003 RDI: ffff8881f7127900
RBP: ffffc900001cf970 R08: dffffc0000000000 R09: ffffed103ee24f21
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff8881f7127900 R14: 0000000000000003 R15: 1ffff92000039f20
FS:  0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055ff80755c60 CR3: 000000010e0e9000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 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 include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_lock+0x139/0x1b0 kernel/locking/spinlock.c:154
 __mod_timer+0x56e/0xcf0 kernel/time/timer.c:1049
 mod_timer+0x1f/0x30 kernel/time/timer.c:1114
 sk_reset_timer+0x22/0xb0 net/core/sock.c:3141
 inet_csk_reset_xmit_timer include/net/inet_connection_sock.h:237 [inline]
 tcp_reset_xmit_timer include/net/tcp.h:1324 [inline]
 tcp_schedule_loss_probe+0x42c/0x550 net/ipv4/tcp_output.c:2787
 tcp_set_xmit_timer net/ipv4/tcp_input.c:3198 [inline]
 tcp_ack+0x3f85/0x68a0 net/ipv4/tcp_input.c:3922
 tcp_rcv_established+0xcd6/0x1ac0 net/ipv4/tcp_input.c:5904
 tcp_v4_do_rcv+0x3d7/0xa00 net/ipv4/tcp_ipv4.c:1722
 tcp_v4_rcv+0x23dd/0x2a70 net/ipv4/tcp_ipv4.c:2125
 ip_protocol_deliver_rcu+0x32f/0x710 net/ipv4/ip_input.c:204
 ip_local_deliver_finish net/ipv4/ip_input.c:231 [inline]
 NF_HOOK include/linux/netfilter.h:305 [inline]
 ip_local_deliver+0x2c6/0x590 net/ipv4/ip_input.c:252
 dst_input include/net/dst.h:454 [inline]
 ip_sublist_rcv_finish net/ipv4/ip_input.c:577 [inline]
 ip_list_rcv_finish net/ipv4/ip_input.c:628 [inline]
 ip_sublist_rcv+0x7e2/0x980 net/ipv4/ip_input.c:636
 ip_list_rcv+0x422/0x470 net/ipv4/ip_input.c:671
 __netif_receive_skb_list_ptype net/core/dev.c:5535 [inline]
 __netif_receive_skb_list_core+0x6b1/0x890 net/core/dev.c:5583
 __netif_receive_skb_list net/core/dev.c:5635 [inline]
 netif_receive_skb_list_internal+0x967/0xcc0 net/core/dev.c:5726
 gro_normal_list net/core/dev.c:5880 [inline]
 napi_complete_done+0x344/0x770 net/core/dev.c:6618
 virtqueue_napi_complete drivers/net/virtio_net.c:357 [inline]
 virtnet_poll+0xbee/0x1260 drivers/net/virtio_net.c:1592
 __napi_poll+0xc4/0x5a0 net/core/dev.c:7042
 napi_poll net/core/dev.c:7109 [inline]
 net_rx_action+0x47d/0xc50 net/core/dev.c:7196
 __do_softirq+0x26d/0x5bf kernel/softirq.c:565
 do_softirq+0xf6/0x150 kernel/softirq.c:452
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x75/0x80 kernel/softirq.c:379
 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:176 [inline]
 _raw_spin_unlock_bh+0x51/0x60 kernel/locking/spinlock.c:210
 __sock_map_delete net/core/sock_map.c:426 [inline]
 sock_map_delete_elem+0xcb/0x130 net/core/sock_map.c:448
 bpf_prog_2c29ac5cdc6b1842+0x3a/0x9f4
 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_run3+0x11e/0x250 kernel/trace/bpf_trace.c:1918
 __bpf_trace_timer_start+0x2b/0x40 include/trace/events/timer.h:52
 __traceiter_timer_start+0x7f/0xd0 include/trace/events/timer.h:52
 trace_timer_start include/trace/events/timer.h:52 [inline]
 enqueue_timer+0x351/0x4c0 kernel/time/timer.c:592
 internal_add_timer kernel/time/timer.c:617 [inline]
 __mod_timer+0x8d3/0xcf0 kernel/time/timer.c:1068
 schedule_timeout+0x187/0x370 kernel/time/timer.c:1889
 rcu_gp_fqs_loop+0x2af/0xf80 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0xa4/0x350 kernel/rcu/tree.c:2145
 kthread+0x421/0x510 kernel/kthread.c:337
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/06/29 22:30 android13-5.15-lts 9044d25b8ff5 757f06b1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 BUG: soft lockup in tcp_tasklet_func
* Struck through repros no longer work on HEAD.