[moderation] [virt?] KCSAN: data-race in virtqueue_disable_cb / virtqueue_enable_cb_delayed (11)
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syzbot
Mar 27, 2026, 3:23:31 PM (17 hours ago) Mar 27
to syzkaller-upst...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 46b513250491 Merge tag 'v7.0-rc5-smb3-client-fix' of git:/..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1226df72580000
kernel config: https://syzkaller.appspot.com/x/.config?x=3a78dd265deac3a9
dashboard link: https://syzkaller.appspot.com/bug?extid=351377949ff700145dde
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
CC: [eper...@redhat.com jaso...@redhat.com linux-...@vger.kernel.org m...@redhat.com virtual...@lists.linux.dev xuan...@linux.alibaba.com]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/8f19c67785a8/disk-46b51325.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/11dbb9704e20/vmlinux-46b51325.xz
kernel image: https://storage.googleapis.com/syzbot-assets/190d9812e855/bzImage-46b51325.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+351377...@syzkaller.appspotmail.com
==================================================================
BUG: KCSAN: data-race in virtqueue_disable_cb / virtqueue_enable_cb_delayed
write to 0xffff8881027a9588 of 2 bytes by interrupt on cpu 1:
virtqueue_enable_cb_delayed_split drivers/virtio/virtio_ring.c:1102 [inline]
virtqueue_enable_cb_delayed+0x20f/0x660 drivers/virtio/virtio_ring.c:3196
start_xmit+0x15ef/0x1ab0 drivers/net/virtio_net.c:3377
__netdev_start_xmit include/linux/netdevice.h:5325 [inline]
netdev_start_xmit include/linux/netdevice.h:5334 [inline]
xmit_one net/core/dev.c:3883 [inline]
dev_hard_start_xmit+0x136/0x3f0 net/core/dev.c:3899
sch_direct_xmit+0x192/0x550 net/sched/sch_generic.c:347
__dev_xmit_skb net/core/dev.c:4198 [inline]
__dev_queue_xmit+0xca9/0x1f20 net/core/dev.c:4814
dev_queue_xmit include/linux/netdevice.h:3385 [inline]
neigh_hh_output include/net/neighbour.h:540 [inline]
neigh_output include/net/neighbour.h:554 [inline]
ip_finish_output2+0x705/0x8c0 net/ipv4/ip_output.c:237
__ip_finish_output net/ipv4/ip_output.c:-1 [inline]
ip_finish_output+0x112/0x290 net/ipv4/ip_output.c:325
NF_HOOK_COND include/linux/netfilter.h:307 [inline]
ip_output+0xbd/0x1c0 net/ipv4/ip_output.c:438
dst_output include/net/dst.h:470 [inline]
ip_local_out net/ipv4/ip_output.c:131 [inline]
__ip_queue_xmit+0xb68/0xba0 net/ipv4/ip_output.c:534
ip_queue_xmit+0x39/0x50 net/ipv4/ip_output.c:548
__tcp_transmit_skb+0x1af2/0x1f10 net/ipv4/tcp_output.c:1693
tcp_transmit_skb net/ipv4/tcp_output.c:1711 [inline]
tcp_write_xmit+0x1597/0x3640 net/ipv4/tcp_output.c:3064
__tcp_push_pending_frames+0x6d/0x1b0 net/ipv4/tcp_output.c:3247
tcp_push_pending_frames include/net/tcp.h:2285 [inline]
tcp_data_snd_check net/ipv4/tcp_input.c:6127 [inline]
tcp_rcv_established+0xda2/0x12f0 net/ipv4/tcp_input.c:6610
tcp_v4_do_rcv+0x91d/0xa30 net/ipv4/tcp_ipv4.c:1884
tcp_v4_rcv+0x19f8/0x1db0 net/ipv4/tcp_ipv4.c:2319
ip_protocol_deliver_rcu+0x395/0x790 net/ipv4/ip_input.c:207
ip_local_deliver_finish+0x1fc/0x2f0 net/ipv4/ip_input.c:241
NF_HOOK include/linux/netfilter.h:318 [inline]
ip_local_deliver+0xe8/0x1e0 net/ipv4/ip_input.c:262
dst_input include/net/dst.h:480 [inline]
ip_sublist_rcv_finish net/ipv4/ip_input.c:584 [inline]
ip_list_rcv_finish net/ipv4/ip_input.c:636 [inline]
ip_sublist_rcv+0x5a4/0x6a0 net/ipv4/ip_input.c:644
ip_list_rcv+0x261/0x290 net/ipv4/ip_input.c:678
__netif_receive_skb_list_ptype net/core/dev.c:6219 [inline]
__netif_receive_skb_list_core+0x4dc/0x500 net/core/dev.c:6266
__netif_receive_skb_list net/core/dev.c:6318 [inline]
netif_receive_skb_list_internal+0x47d/0x5f0 net/core/dev.c:6409
gro_normal_list include/net/gro.h:523 [inline]
gro_flush_normal include/net/gro.h:531 [inline]
napi_complete_done+0x19c/0x3f0 net/core/dev.c:6777
virtqueue_napi_complete drivers/net/virtio_net.c:749 [inline]
virtnet_poll+0x1bb1/0x2040 drivers/net/virtio_net.c:3091
__napi_poll+0x61/0x330 net/core/dev.c:7704
napi_poll net/core/dev.c:7767 [inline]
net_rx_action+0x452/0x930 net/core/dev.c:7924
handle_softirqs+0xb9/0x2a0 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0x39/0xc0 kernel/softirq.c:723
common_interrupt+0x83/0x90 arch/x86/kernel/irq.c:326
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:688
finish_task_switch+0x86/0x280 kernel/sched/core.c:5155
context_switch kernel/sched/core.c:5301 [inline]
__schedule+0x93c/0xd40 kernel/sched/core.c:6911
__schedule_loop kernel/sched/core.c:6993 [inline]
schedule+0x5e/0xd0 kernel/sched/core.c:7008
schedule_timeout+0xca/0x180 kernel/time/sleep_timeout.c:99
io_wq_worker+0x3a0/0x970 io_uring/io-wq.c:728
ret_from_fork+0x150/0x360 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
read to 0xffff8881027a9588 of 2 bytes by interrupt on cpu 0:
virtqueue_disable_cb_split drivers/virtio/virtio_ring.c:1046 [inline]
virtqueue_disable_cb+0x4c/0x2c0 drivers/virtio/virtio_ring.c:3108
virtqueue_napi_schedule drivers/net/virtio_net.c:738 [inline]
skb_xmit_done+0xb0/0x1a0 drivers/net/virtio_net.c:786
vring_interrupt+0x2d7/0x310 drivers/virtio/virtio_ring.c:3254
__handle_irq_event_percpu+0x9c/0x4d0 kernel/irq/handle.c:209
handle_irq_event_percpu kernel/irq/handle.c:246 [inline]
handle_irq_event+0x64/0xf0 kernel/irq/handle.c:263
handle_edge_irq+0x154/0x470 kernel/irq/chip.c:855
generic_handle_irq_desc include/linux/irqdesc.h:186 [inline]
handle_irq arch/x86/kernel/irq.c:262 [inline]
call_irq_handler arch/x86/kernel/irq.c:-1 [inline]
__common_interrupt+0x60/0xb0 arch/x86/kernel/irq.c:333
common_interrupt+0x7e/0x90 arch/x86/kernel/irq.c:326
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:688
decode_watchpoint kernel/kcsan/encoding.h:74 [inline]
find_watchpoint kernel/kcsan/core.c:132 [inline]
check_access kernel/kcsan/core.c:737 [inline]
__tsan_read8+0x31/0x190 kernel/kcsan/core.c:1025
_find_next_bit+0x29/0x90 lib/find_bit.c:157
find_next_bit include/linux/find.h:73 [inline]
ebitmap_next_positive security/selinux/ss/ebitmap.h:72 [inline]
context_struct_compute_av+0x496/0xaf0 security/selinux/ss/services.c:661
security_compute_av+0x34f/0xa20 security/selinux/ss/services.c:1177
avc_compute_av+0x5d/0x430 security/selinux/avc.c:992
avc_perm_nonode+0x5e/0xe0 security/selinux/avc.c:1117
avc_has_perm_noaudit+0xf2/0x130 security/selinux/avc.c:1160
avc_has_perm+0x60/0x190 security/selinux/avc.c:1195
inode_has_perm security/selinux/hooks.c:1691 [inline]
file_has_perm security/selinux/hooks.c:1787 [inline]
selinux_revalidate_file_permission security/selinux/hooks.c:3793 [inline]
selinux_file_permission+0x633/0x690 security/selinux/hooks.c:3814
security_file_permission+0x3a/0x70 security/security.c:2367
rw_verify_area fs/read_write.c:475 [inline]
vfs_write+0x135/0x9f0 fs/read_write.c:679
ksys_write+0xdc/0x1a0 fs/read_write.c:740
__do_sys_write fs/read_write.c:751 [inline]
__se_sys_write fs/read_write.c:748 [inline]
__x64_sys_write+0x40/0x50 fs/read_write.c:748
x64_sys_call+0x27e1/0x3020 arch/x86/include/generated/asm/syscalls_64.h:2
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
value changed: 0x0001 -> 0x0000
Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3302 Comm: syz-executor Tainted: G W syzkaller #0 PREEMPT(full)
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
==================================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: 46b513250491 Merge tag 'v7.0-rc5-smb3-client-fix' of git:/..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1226df72580000
kernel config: https://syzkaller.appspot.com/x/.config?x=3a78dd265deac3a9
dashboard link: https://syzkaller.appspot.com/bug?extid=351377949ff700145dde
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
CC: [eper...@redhat.com jaso...@redhat.com linux-...@vger.kernel.org m...@redhat.com virtual...@lists.linux.dev xuan...@linux.alibaba.com]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/8f19c67785a8/disk-46b51325.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/11dbb9704e20/vmlinux-46b51325.xz
kernel image: https://storage.googleapis.com/syzbot-assets/190d9812e855/bzImage-46b51325.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+351377...@syzkaller.appspotmail.com
==================================================================
BUG: KCSAN: data-race in virtqueue_disable_cb / virtqueue_enable_cb_delayed
write to 0xffff8881027a9588 of 2 bytes by interrupt on cpu 1:
virtqueue_enable_cb_delayed_split drivers/virtio/virtio_ring.c:1102 [inline]
virtqueue_enable_cb_delayed+0x20f/0x660 drivers/virtio/virtio_ring.c:3196
start_xmit+0x15ef/0x1ab0 drivers/net/virtio_net.c:3377
__netdev_start_xmit include/linux/netdevice.h:5325 [inline]
netdev_start_xmit include/linux/netdevice.h:5334 [inline]
xmit_one net/core/dev.c:3883 [inline]
dev_hard_start_xmit+0x136/0x3f0 net/core/dev.c:3899
sch_direct_xmit+0x192/0x550 net/sched/sch_generic.c:347
__dev_xmit_skb net/core/dev.c:4198 [inline]
__dev_queue_xmit+0xca9/0x1f20 net/core/dev.c:4814
dev_queue_xmit include/linux/netdevice.h:3385 [inline]
neigh_hh_output include/net/neighbour.h:540 [inline]
neigh_output include/net/neighbour.h:554 [inline]
ip_finish_output2+0x705/0x8c0 net/ipv4/ip_output.c:237
__ip_finish_output net/ipv4/ip_output.c:-1 [inline]
ip_finish_output+0x112/0x290 net/ipv4/ip_output.c:325
NF_HOOK_COND include/linux/netfilter.h:307 [inline]
ip_output+0xbd/0x1c0 net/ipv4/ip_output.c:438
dst_output include/net/dst.h:470 [inline]
ip_local_out net/ipv4/ip_output.c:131 [inline]
__ip_queue_xmit+0xb68/0xba0 net/ipv4/ip_output.c:534
ip_queue_xmit+0x39/0x50 net/ipv4/ip_output.c:548
__tcp_transmit_skb+0x1af2/0x1f10 net/ipv4/tcp_output.c:1693
tcp_transmit_skb net/ipv4/tcp_output.c:1711 [inline]
tcp_write_xmit+0x1597/0x3640 net/ipv4/tcp_output.c:3064
__tcp_push_pending_frames+0x6d/0x1b0 net/ipv4/tcp_output.c:3247
tcp_push_pending_frames include/net/tcp.h:2285 [inline]
tcp_data_snd_check net/ipv4/tcp_input.c:6127 [inline]
tcp_rcv_established+0xda2/0x12f0 net/ipv4/tcp_input.c:6610
tcp_v4_do_rcv+0x91d/0xa30 net/ipv4/tcp_ipv4.c:1884
tcp_v4_rcv+0x19f8/0x1db0 net/ipv4/tcp_ipv4.c:2319
ip_protocol_deliver_rcu+0x395/0x790 net/ipv4/ip_input.c:207
ip_local_deliver_finish+0x1fc/0x2f0 net/ipv4/ip_input.c:241
NF_HOOK include/linux/netfilter.h:318 [inline]
ip_local_deliver+0xe8/0x1e0 net/ipv4/ip_input.c:262
dst_input include/net/dst.h:480 [inline]
ip_sublist_rcv_finish net/ipv4/ip_input.c:584 [inline]
ip_list_rcv_finish net/ipv4/ip_input.c:636 [inline]
ip_sublist_rcv+0x5a4/0x6a0 net/ipv4/ip_input.c:644
ip_list_rcv+0x261/0x290 net/ipv4/ip_input.c:678
__netif_receive_skb_list_ptype net/core/dev.c:6219 [inline]
__netif_receive_skb_list_core+0x4dc/0x500 net/core/dev.c:6266
__netif_receive_skb_list net/core/dev.c:6318 [inline]
netif_receive_skb_list_internal+0x47d/0x5f0 net/core/dev.c:6409
gro_normal_list include/net/gro.h:523 [inline]
gro_flush_normal include/net/gro.h:531 [inline]
napi_complete_done+0x19c/0x3f0 net/core/dev.c:6777
virtqueue_napi_complete drivers/net/virtio_net.c:749 [inline]
virtnet_poll+0x1bb1/0x2040 drivers/net/virtio_net.c:3091
__napi_poll+0x61/0x330 net/core/dev.c:7704
napi_poll net/core/dev.c:7767 [inline]
net_rx_action+0x452/0x930 net/core/dev.c:7924
handle_softirqs+0xb9/0x2a0 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0x39/0xc0 kernel/softirq.c:723
common_interrupt+0x83/0x90 arch/x86/kernel/irq.c:326
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:688
finish_task_switch+0x86/0x280 kernel/sched/core.c:5155
context_switch kernel/sched/core.c:5301 [inline]
__schedule+0x93c/0xd40 kernel/sched/core.c:6911
__schedule_loop kernel/sched/core.c:6993 [inline]
schedule+0x5e/0xd0 kernel/sched/core.c:7008
schedule_timeout+0xca/0x180 kernel/time/sleep_timeout.c:99
io_wq_worker+0x3a0/0x970 io_uring/io-wq.c:728
ret_from_fork+0x150/0x360 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
read to 0xffff8881027a9588 of 2 bytes by interrupt on cpu 0:
virtqueue_disable_cb_split drivers/virtio/virtio_ring.c:1046 [inline]
virtqueue_disable_cb+0x4c/0x2c0 drivers/virtio/virtio_ring.c:3108
virtqueue_napi_schedule drivers/net/virtio_net.c:738 [inline]
skb_xmit_done+0xb0/0x1a0 drivers/net/virtio_net.c:786
vring_interrupt+0x2d7/0x310 drivers/virtio/virtio_ring.c:3254
__handle_irq_event_percpu+0x9c/0x4d0 kernel/irq/handle.c:209
handle_irq_event_percpu kernel/irq/handle.c:246 [inline]
handle_irq_event+0x64/0xf0 kernel/irq/handle.c:263
handle_edge_irq+0x154/0x470 kernel/irq/chip.c:855
generic_handle_irq_desc include/linux/irqdesc.h:186 [inline]
handle_irq arch/x86/kernel/irq.c:262 [inline]
call_irq_handler arch/x86/kernel/irq.c:-1 [inline]
__common_interrupt+0x60/0xb0 arch/x86/kernel/irq.c:333
common_interrupt+0x7e/0x90 arch/x86/kernel/irq.c:326
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:688
decode_watchpoint kernel/kcsan/encoding.h:74 [inline]
find_watchpoint kernel/kcsan/core.c:132 [inline]
check_access kernel/kcsan/core.c:737 [inline]
__tsan_read8+0x31/0x190 kernel/kcsan/core.c:1025
_find_next_bit+0x29/0x90 lib/find_bit.c:157
find_next_bit include/linux/find.h:73 [inline]
ebitmap_next_positive security/selinux/ss/ebitmap.h:72 [inline]
context_struct_compute_av+0x496/0xaf0 security/selinux/ss/services.c:661
security_compute_av+0x34f/0xa20 security/selinux/ss/services.c:1177
avc_compute_av+0x5d/0x430 security/selinux/avc.c:992
avc_perm_nonode+0x5e/0xe0 security/selinux/avc.c:1117
avc_has_perm_noaudit+0xf2/0x130 security/selinux/avc.c:1160
avc_has_perm+0x60/0x190 security/selinux/avc.c:1195
inode_has_perm security/selinux/hooks.c:1691 [inline]
file_has_perm security/selinux/hooks.c:1787 [inline]
selinux_revalidate_file_permission security/selinux/hooks.c:3793 [inline]
selinux_file_permission+0x633/0x690 security/selinux/hooks.c:3814
security_file_permission+0x3a/0x70 security/security.c:2367
rw_verify_area fs/read_write.c:475 [inline]
vfs_write+0x135/0x9f0 fs/read_write.c:679
ksys_write+0xdc/0x1a0 fs/read_write.c:740
__do_sys_write fs/read_write.c:751 [inline]
__se_sys_write fs/read_write.c:748 [inline]
__x64_sys_write+0x40/0x50 fs/read_write.c:748
x64_sys_call+0x27e1/0x3020 arch/x86/include/generated/asm/syscalls_64.h:2
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
value changed: 0x0001 -> 0x0000
Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3302 Comm: syz-executor Tainted: G W syzkaller #0 PREEMPT(full)
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
==================================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
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