BUG: soft lockup in sock_read_iter

Status: auto-obsoleted due to no activity on 2025/10/10 06:20
Reported-by: syzbot+b731b91f4084b67c0b55@syzkaller.appspotmail.com
First crash: 396d, last: 383d
▶ ▼ Similar bugs (7)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-5-15 BUG: soft lockup in sock_read_iter 1 10 713d 844d 0/2 auto-obsoleted due to no activity on 2024/11/14 07:45
android-6-1 BUG: soft lockup in sock_read_iter (2) 1 2 276d 326d 0/2 auto-obsoleted due to no activity on 2026/01/25 06:24
android-6-1 BUG: soft lockup in sock_read_iter 1 2 459d 498d 0/2 auto-obsoleted due to no activity on 2025/07/26 10:57
linux-6.1 INFO: rcu detected stall in sock_read_iter 1 1 561d 561d 0/3 auto-obsoleted due to no activity on 2025/04/25 05:42
upstream INFO: rcu detected stall in sock_read_iter net 1 1 1393d 1393d 0/29 auto-obsoleted due to no activity on 2022/12/05 11:10
linux-5.15 INFO: rcu detected stall in sock_read_iter 1 1 64d 64d 0/3 upstream: reported on 2026/05/27 14:02
upstream INFO: rcu detected stall in sock_read_iter (2) net 1 1 652d 652d 0/29 auto-obsoleted due to no activity on 2025/01/14 23:11

Sample crash report:
 kthread+0x346/0x3d0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
watchdog: BUG: soft lockup - CPU#0 stuck for 123s! [syz-executor:267]
Modules linked in:
CPU: 0 PID: 267 Comm: syz-executor Tainted: G        W         5.10.238-syzkaller-00008-g59e9a7228857 #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 3f 9d 98 03 f4 eb 0e 0f 1f 44 00 00 0f 00 2d 30 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:ffffc90000b37440 EFLAGS: 00000246
RAX: 0000000000000003 RBX: ffff88811bdc44c8 RCX: ffffffff814b175a
RDX: 0000000000000001 RSI: 0000000000000003 RDI: ffff88811bdc44c8
RBP: ffffc90000b374f0 R08: dffffc0000000000 R09: ffffed10237b889a
R10: ffffed10237b889a R11: 1ffff110237b8899 R12: 0000000000000246
R13: 1ffff110237b8899 R14: dffffc0000000000 R15: 1ffff92000166e8c
FS:  00005555899b2500(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000010000 CR3: 000000011d9aa000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
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]
 tcp_recvmsg+0x229/0x2e10 net/ipv4/tcp.c:2149
 inet_recvmsg+0x134/0x470 net/ipv4/af_inet.c:864
 sock_recvmsg_nosec net/socket.c:905 [inline]
 sock_recvmsg net/socket.c:923 [inline]
 sock_read_iter+0x2a2/0x340 net/socket.c:996
 call_read_iter include/linux/fs.h:2060 [inline]
 new_sync_read fs/read_write.c:415 [inline]
 vfs_read+0x874/0xa10 fs/read_write.c:496
 ksys_read+0x140/0x240 fs/read_write.c:634
 __do_sys_read fs/read_write.c:644 [inline]
 __se_sys_read fs/read_write.c:642 [inline]
 __x64_sys_read+0x7b/0x90 fs/read_write.c:642
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fa1a6a482fd
Code: a8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb b5 e8 a8 48 00 00 0f 1f 84 00 00 00 00 00 80 3d 41 92 1f 00 00 74 17 31 c0 0f 05 <48> 3d 00 f0 ff ff 77 5b c3 66 2e 0f 1f 84 00 00 00 00 00 48 83 ec
RSP: 002b:00007ffdee68d8f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007ffdee68da00 RCX: 00007fa1a6a482fd
RDX: 0000000000000004 RSI: 00007ffdee68d90c RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000417 R09: 001867e2b6877d94
R10: 000002199e29d400 R11: 0000000000000246 R12: 00007ffdee68dd20
R13: 0000000000000004 R14: 00007ffdee68d90c R15: 00007ffdee68d9a0
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 58 Comm: jbd2/sda1-8 Tainted: G        W         5.10.238-syzkaller-00008-g59e9a7228857 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:native_halt arch/x86/include/asm/irqflags.h:66 [inline]
RIP: 0010:halt arch/x86/include/asm/irqflags.h:112 [inline]
RIP: 0010:kvm_wait+0xb2/0x120 arch/x86/kernel/kvm.c:921
Code: c1 e8 03 42 0f b6 04 30 84 c0 75 6d 0f b6 07 40 38 f0 75 26 41 f7 c4 00 02 00 00 75 0f 0f 1f 44 00 00 0f 00 2d 3f 9d 98 03 f4 <eb> 0e 0f 1f 44 00 00 0f 00 2d 30 9d 98 03 fb f4 4c 89 64 24 18 ff
RSP: 0018:ffffc9000016f780 EFLAGS: 00000046
RAX: 0000000000000003 RBX: ffff8881f7147840 RCX: ffffffff814b175a
RDX: 0000000000000001 RSI: 0000000000000003 RDI: ffff8881f7147840
RBP: ffffc9000016f830 R08: dffffc0000000000 R09: ffffed103ee28f09
R10: ffffed103ee28f09 R11: 1ffff1103ee28f08 R12: 0000000000000046
R13: 1ffff1103ee28f08 R14: dffffc0000000000 R15: 1ffff9200002def4
FS:  0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000014fad3000 CR4: 00000000003506a0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 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_flags include/linux/spinlock.h:195 [inline]
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:119 [inline]
 _raw_spin_lock_irqsave+0x108/0x110 kernel/locking/spinlock.c:159
 lock_timer_base+0x127/0x270 kernel/time/timer.c:952
 __mod_timer+0x10a/0xb30 kernel/time/timer.c:1025
 add_timer+0x68/0x80 kernel/time/timer.c:1165
 __queue_delayed_work+0x173/0x200 kernel/workqueue.c:1683
 queue_delayed_work_on+0xde/0x130 kernel/workqueue.c:1708
 queue_delayed_work include/linux/workqueue.h:530 [inline]
 schedule_delayed_work include/linux/workqueue.h:634 [inline]
 kvfree_call_rcu+0x417/0x620 kernel/rcu/tree.c:3564
 trie_delete_elem+0x57a/0x710 kernel/bpf/lpm_trie.c:-1
 bpf_prog_3d1485d3268e5ad0+0x40/0x71c
 bpf_dispatcher_nop_func include/linux/bpf.h:669 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2061 [inline]
 bpf_trace_run3+0xcb/0x230 kernel/trace/bpf_trace.c:2099
 __bpf_trace_timer_start+0x2b/0x40 include/trace/events/timer.h:52
 trace_timer_start include/trace/events/timer.h:52 [inline]
 enqueue_timer+0x337/0x480 kernel/time/timer.c:592
 __mod_timer+0x79f/0xb30 kernel/time/timer.c:-1
 mod_timer+0x1f/0x30 kernel/time/timer.c:1119
 sk_reset_timer+0x22/0xb0 net/core/sock.c:3003
 tcp_send_delayed_ack+0x30a/0x400 net/ipv4/tcp_output.c:3968
 __tcp_ack_snd_check+0x420/0x8f0 net/ipv4/tcp_input.c:5542
 tcp_ack_snd_check net/ipv4/tcp_input.c:5583 [inline]
 tcp_rcv_established+0x9f6/0x1980 net/ipv4/tcp_input.c:6008
 tcp_v4_do_rcv+0x4c1/0x7c0 net/ipv4/tcp_ipv4.c:1698
 tcp_v4_rcv+0x2157/0x26b0 net/ipv4/tcp_ipv4.c:2094
 ip_protocol_deliver_rcu+0x2f0/0x640 net/ipv4/ip_input.c:204
 ip_local_deliver_finish net/ipv4/ip_input.c:231 [inline]
 NF_HOOK include/linux/netfilter.h:299 [inline]
 ip_local_deliver+0x2de/0x530 net/ipv4/ip_input.c:252
 dst_input include/net/dst.h:461 [inline]
 ip_sublist_rcv_finish net/ipv4/ip_input.c:558 [inline]
 ip_list_rcv_finish net/ipv4/ip_input.c:609 [inline]
 ip_sublist_rcv+0x747/0x860 net/ipv4/ip_input.c:617
 ip_list_rcv+0x3da/0x420 net/ipv4/ip_input.c:652
 __netif_receive_skb_list_ptype net/core/dev.c:5445 [inline]
 __netif_receive_skb_list_core+0x574/0x740 net/core/dev.c:5493
 __netif_receive_skb_list net/core/dev.c:5545 [inline]
 netif_receive_skb_list_internal+0x7d2/0xa60 net/core/dev.c:5655
 gro_normal_list net/core/dev.c:5809 [inline]
 napi_complete_done+0x36f/0x770 net/core/dev.c:6558
 virtqueue_napi_complete drivers/net/virtio_net.c:357 [inline]
 virtnet_poll+0x8b4/0xef0 drivers/net/virtio_net.c:1537
 napi_poll net/core/dev.c:6874 [inline]
 net_rx_action+0x432/0xdd0 net/core/dev.c:6944
 __do_softirq+0x255/0x563 kernel/softirq.c:309
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
 do_softirq_own_stack+0x60/0x80 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:405 [inline]
 __irq_exit_rcu+0x128/0x150 kernel/softirq.c:435
 irq_exit_rcu+0x9/0x10 kernel/softirq.c:447
 sysvec_irq_work+0xbc/0xd0 arch/x86/kernel/irq_work.c:17
 asm_sysvec_irq_work+0x12/0x20 arch/x86/include/asm/idtentry.h:661
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x49/0x70 kernel/locking/spinlock.c:199
Code: 12 48 89 fb 48 c7 c7 f0 64 2c 86 e8 81 cc 28 fd 48 89 df 48 83 3d f6 ac b7 01 00 74 27 e8 f3 4d d6 fc 66 90 fb bf 01 00 00 00 <e8> 82 4d cf fc 65 8b 05 77 b5 8d 7b 85 c0 74 03 5b 5d c3 e8 b3 b2
RSP: 0018:ffffc90000ad7ba8 EFLAGS: 00000246
RAX: 0000000000000001 RBX: dffffc0000000000 RCX: dffffc0000000000
RDX: 0000000040000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffffc90000ad7bb0 R08: dffffc0000000000 R09: fffffbfff0d463f3
R10: fffffbfff0d463f3 R11: 1ffffffff0d463f2 R12: ffff8881f7155fc0
R13: ffff888107394f2c R14: 0000000000000000 R15: ffff88810b36bb40
 finish_lock_switch kernel/sched/core.c:3786 [inline]
 finish_task_switch+0x12e/0x5a0 kernel/sched/core.c:3886
 context_switch kernel/sched/core.c:4051 [inline]
 __schedule+0xb4f/0x1310 kernel/sched/core.c:4806
 schedule+0x13c/0x1d0 kernel/sched/core.c:4884
 kjournald2+0x4b6/0x860 fs/jbd2/journal.c:249
 kthread+0x346/0x3d0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/07/12 06:18 android13-5.10-lts 59e9a7228857 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10-perf BUG: soft lockup in sock_read_iter
2025/06/29 15:04 android13-5.10-lts 59e9a7228857 fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10-perf BUG: soft lockup in sock_read_iter
* Struck through repros no longer work on HEAD.