syzbot


INFO: rcu detected stall in ip_list_rcv (3)

Status: closed as invalid on 2022/02/08 10:10
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 336d, last: 336d
similar bugs (4):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream BUG: soft lockup in ip_list_rcv (2) 8 217d 217d 0/24 auto-closed as invalid on 2022/06/25 08:42
upstream INFO: rcu detected stall in ip_list_rcv C error done 3 790d 816d 17/24 fixed on 2020/11/16 12:12
upstream INFO: rcu detected stall in ip_list_rcv (4) 1 148d 148d 0/24 auto-closed as invalid on 2022/09/01 16:20
upstream INFO: rcu detected stall in ip_list_rcv (2) 3 644d 723d 0/24 auto-closed as invalid on 2021/05/23 12:59

Sample crash report:
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (10499 ticks this GP) idle=93f/1/0x4000000000000000 softirq=151632/151632 fqs=0 
	(t=10500 jiffies g=237429 q=94)
rcu: rcu_preempt kthread timer wakeup didn't happen for 10499 jiffies! g237429 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=103888
rcu: rcu_preempt kthread starved for 10500 jiffies! g237429 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:I stack:28888 pid:   14 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4972 [inline]
 __schedule+0xa9a/0x4900 kernel/sched/core.c:6253
 schedule+0xd2/0x260 kernel/sched/core.c:6326
 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881
 rcu_gp_fqs_loop+0x186/0x810 kernel/rcu/tree.c:1955
 rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2128
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 31147 Comm: syz-executor.0 Not tainted 5.16.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:40 [inline]
RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:75 [inline]
RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:107 [inline]
RIP: 0010:lock_release+0x14d/0x720 kernel/locking/lockdep.c:5653
Code: 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 69 05 00 00 45 8b 8e 5c 0a 00 00 45 85 c9 0f 85 9e 02 00 00 9c 8f 04 24 <fa> 48 c7 c7 80 f9 ab 89 e8 36 24 e8 07 48 89 da 83 e3 07 48 b8 00
RSP: 0018:ffffc90000fd7ec0 EFLAGS: 00000046
RAX: 0000000000000007 RBX: ffffffff8d914fac RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000010104 RDI: ffff888049400d1c
RBP: 1ffff920001fafda R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffff888076dd1b00
R13: 17bb8f52af771ea5 R14: ffff8880494002c0 R15: 17bb8f52af771ea5
FS:  00007f39abe6c700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32023000 CR3: 0000000019707000 CR4: 00000000003506e0
Call Trace:
 <IRQ>
 __raw_spin_unlock include/linux/spinlock_api_smp.h:141 [inline]
 _raw_spin_unlock+0x12/0x40 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:389 [inline]
 advance_sched+0x435/0x9a0 net/sched/sch_taprio.c:763
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x609/0xe50 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103
 sysvec_apic_timer_interrupt+0x40/0xc0 arch/x86/kernel/apic/apic.c:1097
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:kmem_cache_free.part.0+0xba/0x200 mm/slab.c:3743
Code: 00 84 c0 75 0e 4c 89 ea 4c 89 e6 48 89 ef e8 1d c0 ff ff 48 85 db 75 34 9c 58 f6 c4 02 0f 85 02 01 00 00 48 85 db 74 01 fb 5b <5d> 41 5c 41 5d c3 48 83 7d 50 00 0f 84 02 01 00 00 31 c9 eb b7 4c
RSP: 0018:ffffc90000fd8280 EFLAGS: 00000206
RAX: 0000000000000016 RBX: 0000000000000001 RCX: 1ffffffff1ff8ca6
RDX: 0000000000000000 RSI: 0000000000000102 RDI: 0000000000000000
RBP: ffff8881400a2b00 R08: 0000000000000001 R09: ffffffff8ff7aacf
R10: 0000000000000001 R11: 000000000008808a R12: ffff888049535ac0
R13: ffffffff8724e146 R14: ffff888049535ac0 R15: ffff88807c6a0040
 kfree_skbmem+0x166/0x1b0 net/core/skbuff.c:721
 tcp_wmem_free_skb include/net/tcp.h:300 [inline]
 tcp_rtx_queue_unlink_and_free include/net/tcp.h:1889 [inline]
 tcp_clean_rtx_queue net/ipv4/tcp_input.c:3313 [inline]
 tcp_ack+0x1ccf/0x5900 net/ipv4/tcp_input.c:3859
 tcp_rcv_established+0x1547/0x2130 net/ipv4/tcp_input.c:5860
 tcp_v4_do_rcv+0x65a/0x970 net/ipv4/tcp_ipv4.c:1719
 tcp_v4_rcv+0x2768/0x3080 net/ipv4/tcp_ipv4.c:2113
 ip_protocol_deliver_rcu+0xa7/0xee0 net/ipv4/ip_input.c:204
 ip_local_deliver_finish+0x20a/0x370 net/ipv4/ip_input.c:231
 NF_HOOK include/linux/netfilter.h:307 [inline]
 NF_HOOK include/linux/netfilter.h:301 [inline]
 ip_local_deliver+0x1b3/0x200 net/ipv4/ip_input.c:252
 dst_input include/net/dst.h:460 [inline]
 ip_sublist_rcv_finish+0x9a/0x2c0 net/ipv4/ip_input.c:551
 ip_list_rcv_finish.constprop.0+0x51e/0x6e0 net/ipv4/ip_input.c:601
 ip_sublist_rcv net/ipv4/ip_input.c:609 [inline]
 ip_list_rcv+0x34e/0x490 net/ipv4/ip_input.c:644
 __netif_receive_skb_list_ptype net/core/dev.c:5508 [inline]
 __netif_receive_skb_list_core+0x549/0x8e0 net/core/dev.c:5556
 __netif_receive_skb_list net/core/dev.c:5608 [inline]
 netif_receive_skb_list_internal+0x75e/0xd80 net/core/dev.c:5699
 gro_normal_list net/core/dev.c:5853 [inline]
 gro_normal_list net/core/dev.c:5849 [inline]
 napi_complete_done+0x1f1/0x880 net/core/dev.c:6590
 virtqueue_napi_complete drivers/net/virtio_net.c:339 [inline]
 virtnet_poll+0xca2/0x11b0 drivers/net/virtio_net.c:1554
 __napi_poll+0xaf/0x440 net/core/dev.c:7023
 napi_poll net/core/dev.c:7090 [inline]
 net_rx_action+0x801/0xb40 net/core/dev.c:7177
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
 common_interrupt+0xa9/0xc0 arch/x86/kernel/irq.c:240
 </IRQ>
 <TASK>
 asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:629
RIP: 0010:ext4_isize fs/ext4/ext4.h:3343 [inline]
RIP: 0010:ext4_do_update_inode fs/ext4/inode.c:5086 [inline]
RIP: 0010:ext4_mark_iloc_dirty+0x3cd/0x1cf0 fs/ext4/inode.c:5694
Code: 04 02 84 c0 74 08 3c 03 0f 8e 08 13 00 00 49 8d 7e 04 8b 5b 60 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 <48> 89 f8 83 e0 07 81 e3 00 40 00 00 83 c0 03 38 d0 7c 08 84 d2 0f
RSP: 0018:ffffc90002f17230 EFLAGS: 00000a07
RAX: dffffc0000000000 RBX: 00000000000102c6 RCX: ffffc9000fe95000
RDX: 0000000000000000 RSI: ffffffff82111512 RDI: ffff888060b32d04
RBP: ffff888047b5e420 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff82111475 R11: 0000000000000000 R12: ffff888047a84c30
R13: ffff888047b5e8b8 R14: ffff888060b32d00 R15: ffffc90002f17358
 __ext4_mark_inode_dirty+0x220/0x8d0 fs/ext4/inode.c:5890
 __ext4_ext_dirty+0x1ca/0x230 fs/ext4/extents.c:183
 ext4_ext_insert_extent+0xdd0/0x4160 fs/ext4/extents.c:2173
 ext4_ext_map_blocks+0x121c/0x5f40 fs/ext4/extents.c:4306
 ext4_map_blocks+0x653/0x17d0 fs/ext4/inode.c:637
 ext4_alloc_file_blocks.isra.0+0x2c1/0xae0 fs/ext4/extents.c:4472
 ext4_fallocate+0x488/0x41d0 fs/ext4/extents.c:4753
 vfs_fallocate+0x48d/0xe10 fs/open.c:307
 ioctl_preallocate+0x18e/0x200 fs/ioctl.c:294
 file_ioctl fs/ioctl.c:334 [inline]
 do_vfs_ioctl+0x1144/0x15d0 fs/ioctl.c:853
 __do_sys_ioctl fs/ioctl.c:872 [inline]
 __se_sys_ioctl fs/ioctl.c:860 [inline]
 __x64_sys_ioctl+0x108/0x200 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f39ad4f6e99
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f39abe6c168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f39ad609f60 RCX: 00007f39ad4f6e99
RDX: 0000000020000040 RSI: 000000004030582a RDI: 0000000000000003
RBP: 00007f39ad550ff1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe190b5ebf R14: 00007f39abe6c300 R15: 0000000000022000
 </TASK>
NMI backtrace for cpu 0
CPU: 0 PID: 3609 Comm: syz-fuzzer Not tainted 5.16.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:343
 print_cpu_stall kernel/rcu/tree_stall.h:627 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:711 [inline]
 rcu_pending kernel/rcu/tree.c:3878 [inline]
 rcu_sched_clock_irq.cold+0x5c/0x759 kernel/rcu/tree.c:2597
 update_process_times+0x16d/0x200 kernel/time/timer.c:1785
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1428
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103
 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:kvm_wait+0x98/0x100 arch/x86/kernel/kvm.c:1001
Code: fa 83 e2 07 38 d0 7f 04 84 c0 75 63 0f b6 07 40 38 c6 74 35 48 83 c4 10 c3 c3 e8 e3 81 49 00 eb 07 0f 00 2d 1a 8f 75 08 fb f4 <48> 83 c4 10 c3 89 74 24 0c 48 89 3c 24 e8 a6 7c 49 00 8b 74 24 0c
RSP: 0018:ffffc90001a879e0 EFLAGS: 00000202
RAX: 00000000003fa1a2 RBX: 0000000000000000 RCX: 1ffffffff1ff84f6
RDX: 0000000000000000 RSI: 0000000000000201 RDI: 0000000000000000
RBP: ffff88807c6a00c8 R08: 0000000000000001 R09: ffffffff8ff7aabf
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000
R13: ffffed100f8d4019 R14: 0000000000000001 R15: ffff8880b9c3a900
 pv_wait arch/x86/include/asm/paravirt.h:603 [inline]
 pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline]
 __pv_queued_spin_lock_slowpath+0x8b8/0xb40 kernel/locking/qspinlock.c:508
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:591 [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+0x200/0x2b0 kernel/locking/spinlock_debug.c:115
 spin_lock_bh include/linux/spinlock.h:354 [inline]
 lock_sock_nested+0x5b/0xf0 net/core/sock.c:3288
 lock_sock include/net/sock.h:1645 [inline]
 tcp_sendmsg+0x1d/0x40 net/ipv4/tcp.c:1439
 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:819
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:724
 sock_write_iter+0x289/0x3c0 net/socket.c:1057
 call_write_iter include/linux/fs.h:2162 [inline]
 new_sync_write+0x429/0x660 fs/read_write.c:503
 vfs_write+0x7cd/0xae0 fs/read_write.c:590
 ksys_write+0x1ee/0x250 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4b12db
Code: fb ff eb bd e8 46 96 fb ff e9 61 ff ff ff cc e8 fb 61 fb ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30
RSP: 002b:000000c000b87468 EFLAGS: 00000216 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000c000020800 RCX: 00000000004b12db
RDX: 00000000000000f0 RSI: 000000c00000a200 RDI: 0000000000000006
RBP: 000000c000b874b8 R08: 000000c000b87501 R09: 0000000000000004
R10: 000000c00000a1e0 R11: 0000000000000216 R12: 000000000000011e
R13: 000000c0003b0000 R14: 000000000000007f R15: ffffffffffff383c
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 31147 Comm: syz-executor.0 Not tainted 5.16.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:write_comp_data kernel/kcov.c:221 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp1+0x1d/0x80 kernel/kcov.c:273
Code: 54 c8 20 48 89 10 c3 66 0f 1f 44 00 00 53 41 89 fb 41 89 f1 bf 03 00 00 00 65 48 8b 0c 25 40 70 02 00 48 89 ce 4c 8b 54 24 08 <e8> 4e f7 ff ff 84 c0 74 51 48 8b 81 88 15 00 00 44 8b 81 84 15 00
RSP: 0018:ffffc90000fd7fc8 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff8880b9d2a500 RCX: ffff8880494002c0
RDX: ffff8880494002c0 RSI: ffff8880494002c0 RDI: 0000000000000003
RBP: ffff888076dd1b40 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff81661728 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: ffff8880b9d2a400 R15: 0000000000000001
FS:  00007f39abe6c700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32023000 CR3: 0000000019707000 CR4: 00000000003506e0
Call Trace:
 <IRQ>
 rcu_read_unlock_sched_notrace include/linux/rcupdate.h:810 [inline]
 trace_hrtimer_start include/trace/events/timer.h:195 [inline]
 debug_activate kernel/time/hrtimer.c:476 [inline]
 enqueue_hrtimer+0x2e8/0x3e0 kernel/time/hrtimer.c:1084
 __run_hrtimer kernel/time/hrtimer.c:1702 [inline]
 __hrtimer_run_queues+0xb02/0xe50 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103
 sysvec_apic_timer_interrupt+0x40/0xc0 arch/x86/kernel/apic/apic.c:1097
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:kmem_cache_free.part.0+0xba/0x200 mm/slab.c:3743
Code: 00 84 c0 75 0e 4c 89 ea 4c 89 e6 48 89 ef e8 1d c0 ff ff 48 85 db 75 34 9c 58 f6 c4 02 0f 85 02 01 00 00 48 85 db 74 01 fb 5b <5d> 41 5c 41 5d c3 48 83 7d 50 00 0f 84 02 01 00 00 31 c9 eb b7 4c
RSP: 0018:ffffc90000fd8280 EFLAGS: 00000206
RAX: 0000000000000016 RBX: 0000000000000001 RCX: 1ffffffff1ff8ca6
RDX: 0000000000000000 RSI: 0000000000000102 RDI: 0000000000000000
RBP: ffff8881400a2b00 R08: 0000000000000001 R09: ffffffff8ff7aacf
R10: 0000000000000001 R11: 000000000008808a R12: ffff888049535ac0
R13: ffffffff8724e146 R14: ffff888049535ac0 R15: ffff88807c6a0040
 kfree_skbmem+0x166/0x1b0 net/core/skbuff.c:721
 tcp_wmem_free_skb include/net/tcp.h:300 [inline]
 tcp_rtx_queue_unlink_and_free include/net/tcp.h:1889 [inline]
 tcp_clean_rtx_queue net/ipv4/tcp_input.c:3313 [inline]
 tcp_ack+0x1ccf/0x5900 net/ipv4/tcp_input.c:3859
 tcp_rcv_established+0x1547/0x2130 net/ipv4/tcp_input.c:5860
 tcp_v4_do_rcv+0x65a/0x970 net/ipv4/tcp_ipv4.c:1719
 tcp_v4_rcv+0x2768/0x3080 net/ipv4/tcp_ipv4.c:2113
 ip_protocol_deliver_rcu+0xa7/0xee0 net/ipv4/ip_input.c:204
 ip_local_deliver_finish+0x20a/0x370 net/ipv4/ip_input.c:231
 NF_HOOK include/linux/netfilter.h:307 [inline]
 NF_HOOK include/linux/netfilter.h:301 [inline]
 ip_local_deliver+0x1b3/0x200 net/ipv4/ip_input.c:252
 dst_input include/net/dst.h:460 [inline]
 ip_sublist_rcv_finish+0x9a/0x2c0 net/ipv4/ip_input.c:551
 ip_list_rcv_finish.constprop.0+0x51e/0x6e0 net/ipv4/ip_input.c:601
 ip_sublist_rcv net/ipv4/ip_input.c:609 [inline]
 ip_list_rcv+0x34e/0x490 net/ipv4/ip_input.c:644
 __netif_receive_skb_list_ptype net/core/dev.c:5508 [inline]
 __netif_receive_skb_list_core+0x549/0x8e0 net/core/dev.c:5556
 __netif_receive_skb_list net/core/dev.c:5608 [inline]
 netif_receive_skb_list_internal+0x75e/0xd80 net/core/dev.c:5699
 gro_normal_list net/core/dev.c:5853 [inline]
 gro_normal_list net/core/dev.c:5849 [inline]
 napi_complete_done+0x1f1/0x880 net/core/dev.c:6590
 virtqueue_napi_complete drivers/net/virtio_net.c:339 [inline]
 virtnet_poll+0xca2/0x11b0 drivers/net/virtio_net.c:1554
 __napi_poll+0xaf/0x440 net/core/dev.c:7023
 napi_poll net/core/dev.c:7090 [inline]
 net_rx_action+0x801/0xb40 net/core/dev.c:7177
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
 common_interrupt+0xa9/0xc0 arch/x86/kernel/irq.c:240
 </IRQ>
 <TASK>
 asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:629
RIP: 0010:ext4_isize fs/ext4/ext4.h:3343 [inline]
RIP: 0010:ext4_do_update_inode fs/ext4/inode.c:5086 [inline]
RIP: 0010:ext4_mark_iloc_dirty+0x3cd/0x1cf0 fs/ext4/inode.c:5694
Code: 04 02 84 c0 74 08 3c 03 0f 8e 08 13 00 00 49 8d 7e 04 8b 5b 60 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 <48> 89 f8 83 e0 07 81 e3 00 40 00 00 83 c0 03 38 d0 7c 08 84 d2 0f
RSP: 0018:ffffc90002f17230 EFLAGS: 00000a07
RAX: dffffc0000000000 RBX: 00000000000102c6 RCX: ffffc9000fe95000
RDX: 0000000000000000 RSI: ffffffff82111512 RDI: ffff888060b32d04
RBP: ffff888047b5e420 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff82111475 R11: 0000000000000000 R12: ffff888047a84c30
R13: ffff888047b5e8b8 R14: ffff888060b32d00 R15: ffffc90002f17358
 __ext4_mark_inode_dirty+0x220/0x8d0 fs/ext4/inode.c:5890
 __ext4_ext_dirty+0x1ca/0x230 fs/ext4/extents.c:183
 ext4_ext_insert_extent+0xdd0/0x4160 fs/ext4/extents.c:2173
 ext4_ext_map_blocks+0x121c/0x5f40 fs/ext4/extents.c:4306
 ext4_map_blocks+0x653/0x17d0 fs/ext4/inode.c:637
 ext4_alloc_file_blocks.isra.0+0x2c1/0xae0 fs/ext4/extents.c:4472
 ext4_fallocate+0x488/0x41d0 fs/ext4/extents.c:4753
 vfs_fallocate+0x48d/0xe10 fs/open.c:307
 ioctl_preallocate+0x18e/0x200 fs/ioctl.c:294
 file_ioctl fs/ioctl.c:334 [inline]
 do_vfs_ioctl+0x1144/0x15d0 fs/ioctl.c:853
 __do_sys_ioctl fs/ioctl.c:872 [inline]
 __se_sys_ioctl fs/ioctl.c:860 [inline]
 __x64_sys_ioctl+0x108/0x200 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f39ad4f6e99
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f39abe6c168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f39ad609f60 RCX: 00007f39ad4f6e99
RDX: 0000000020000040 RSI: 000000004030582a RDI: 0000000000000003
RBP: 00007f39ad550ff1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe190b5ebf R14: 00007f39abe6c300 R15: 0000000000022000
 </TASK>
----------------
Code disassembly (best guess):
   0:	02 48 89             	add    -0x77(%rax),%cl
   3:	f8                   	clc
   4:	83 e0 07             	and    $0x7,%eax
   7:	83 c0 03             	add    $0x3,%eax
   a:	38 d0                	cmp    %dl,%al
   c:	7c 08                	jl     0x16
   e:	84 d2                	test   %dl,%dl
  10:	0f 85 69 05 00 00    	jne    0x57f
  16:	45 8b 8e 5c 0a 00 00 	mov    0xa5c(%r14),%r9d
  1d:	45 85 c9             	test   %r9d,%r9d
  20:	0f 85 9e 02 00 00    	jne    0x2c4
  26:	9c                   	pushfq
  27:	8f 04 24             	popq   (%rsp)
* 2a:	fa                   	cli <-- trapping instruction
  2b:	48 c7 c7 80 f9 ab 89 	mov    $0xffffffff89abf980,%rdi
  32:	e8 36 24 e8 07       	callq  0x7e8246d
  37:	48 89 da             	mov    %rbx,%rdx
  3a:	83 e3 07             	and    $0x7,%ebx
  3d:	48                   	rex.W
  3e:	b8                   	.byte 0xb8

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-selinux-root 2021/12/27 14:04 upstream fc74e0a40e4f 5140bd58 .config log report info INFO: rcu detected stall in ip_list_rcv
* Struck through repros no longer work on HEAD.