====================================================== WARNING: possible circular locking dependency detected 4.14.281-syzkaller #0 Not tainted ------------------------------------------------------ kworker/u4:0/5 is trying to acquire lock: (sk_lock-AF_INET){+.+.}, at: [] do_strp_work net/strparser/strparser.c:415 [inline] (sk_lock-AF_INET){+.+.}, at: [] strp_work+0x3e/0x100 net/strparser/strparser.c:434 but task is already holding lock: ((&strp->work)){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2092 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: 8021q: adding VLAN 0 to HW filter on device batadv1 -> #1 ((&strp->work)){+.+.}: flush_work+0xad/0x770 kernel/workqueue.c:2890 __cancel_work_timer+0x321/0x460 kernel/workqueue.c:2965 strp_done+0x53/0xd0 net/strparser/strparser.c:519 kcm_attach net/kcm/kcmsock.c:1429 [inline] kcm_attach_ioctl net/kcm/kcmsock.c:1490 [inline] kcm_ioctl+0x828/0xfb0 net/kcm/kcmsock.c:1701 sock_do_ioctl net/socket.c:974 [inline] sock_ioctl+0x2cc/0x4c0 net/socket.c:1071 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #0 bond1: Enslaving batadv1 as a backup interface with an up link (sk_lock-AF_INET){+.+.}: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 lock_sock_nested+0xb7/0x100 net/core/sock.c:2813 do_strp_work net/strparser/strparser.c:415 [inline] strp_work+0x3e/0x100 net/strparser/strparser.c:434 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 IPv6: ADDRCONF(NETDEV_UP): bond1: link is not ready other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock((&strp->work)); lock(sk_lock-AF_INET); lock((&strp->work)); lock(sk_lock-AF_INET); *** DEADLOCK *** 2 locks held by kworker/u4:0/5: #0: bond1: Warning: No 802.3ad response from the link partner for any adapters in the bond ("%s""kstrp"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2088 #1: 8021q: adding VLAN 0 to HW filter on device bond1 ((&strp->work)){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2092 stack backtrace: CPU: 1 PID: 5 Comm: kworker/u4:0 Not tainted 4.14.281-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: kstrp strp_work Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1258 check_prev_add kernel/locking/lockdep.c:1905 [inline] check_prevs_add kernel/locking/lockdep.c:2022 [inline] validate_chain kernel/locking/lockdep.c:2464 [inline] __lock_acquire+0x2e0e/0x3f20 kernel/locking/lockdep.c:3491 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 lock_sock_nested+0xb7/0x100 net/core/sock.c:2813 do_strp_work net/strparser/strparser.c:415 [inline] strp_work+0x3e/0x100 net/strparser/strparser.c:434 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 bond1: Warning: No 802.3ad response from the link partner for any adapters in the bond bond1 (unregistering): Released all slaves IPv6: ADDRCONF(NETDEV_UP): bond1: link is not ready bond1: Warning: No 802.3ad response from the link partner for any adapters in the bond 8021q: adding VLAN 0 to HW filter on device bond1 bond1 (unregistering): Removing an active aggregator bond1 (unregistering): Releasing backup interface batadv2 bond1 (unregistering): Released all slaves bond1 (unregistering): Removing an active aggregator bond1 (unregistering): Releasing backup interface batadv1 bond1 (unregistering): Released all slaves 8021q: adding VLAN 0 to HW filter on device batadv1 bond1: Enslaving batadv1 as a backup interface with an up link 8021q: adding VLAN 0 to HW filter on device batadv2 bond1: Enslaving batadv2 as a backup interface with an up link bond1: Warning: No 802.3ad response from the link partner for any adapters in the bond IPv6: ADDRCONF(NETDEV_UP): bond1: link is not ready 8021q: adding VLAN 0 to HW filter on device bond1 bond1: Warning: No 802.3ad response from the link partner for any adapters in the bond IPv6: ADDRCONF(NETDEV_UP): bond1: link is not ready 8021q: adding VLAN 0 to HW filter on device bond1 IPv6: ADDRCONF(NETDEV_CHANGE): bond1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): bond1: link becomes ready bond1 (unregistering): Removing an active aggregator bond1 (unregistering): Releasing backup interface batadv1 bond1 (unregistering): Released all slaves bond1 (unregistering): Removing an active aggregator bond1 (unregistering): Releasing backup interface batadv2 bond1 (unregistering): Released all slaves 8021q: adding VLAN 0 to HW filter on device batadv3 bond1: Enslaving batadv3 as a backup interface with an up link bond1: Warning: No 802.3ad response from the link partner for any adapters in the bond IPv6: ADDRCONF(NETDEV_UP): bond1: link is not ready 8021q: adding VLAN 0 to HW filter on device bond1 IPv6: ADDRCONF(NETDEV_CHANGE): bond1: link becomes ready bond1 (unregistering): Removing an active aggregator bond1 (unregistering): Releasing backup interface batadv3 bond1 (unregistering): Released all slaves 8021q: adding VLAN 0 to HW filter on device batadv4 bond1: Enslaving batadv4 as a backup interface with an up link bond1 (unregistering): Releasing backup interface batadv4 bond1 (unregistering): Released all slaves 8021q: adding VLAN 0 to HW filter on device batadv5 bond1: Enslaving batadv5 as a backup interface with an up link bond1 (unregistering): Releasing backup interface batadv5 bond1 (unregistering): Released all slaves 8021q: adding VLAN 0 to HW filter on device batadv6 bond1: Enslaving batadv6 as a backup interface with an up link bond1 (unregistering): Releasing backup interface batadv6 bond1 (unregistering): Released all slaves 8021q: adding VLAN 0 to HW filter on device batadv1 bond4: Enslaving batadv1 as a backup interface with an up link 8021q: adding VLAN 0 to HW filter on device batadv7 bond1: Enslaving batadv7 as a backup interface with an up link bond4 (unregistering): Releasing backup interface batadv1 bond4 (unregistering): Released all slaves bond1 (unregistering): Releasing backup interface batadv7 bond1 (unregistering): Released all slaves 8021q: adding VLAN 0 to HW filter on device batadv2 bond1: Enslaving batadv2 as a backup interface with an up link bond1 (unregistering): Releasing backup interface batadv2 bond1 (unregistering): Released all slaves 8021q: adding VLAN 0 to HW filter on device batadv2 bond4: Enslaving batadv2 as a backup interface with an up link 8021q: adding VLAN 0 to HW filter on device batadv8 bond1: Enslaving batadv8 as a backup interface with an up link 8021q: adding VLAN 0 to HW filter on device batadv3 bond1: Enslaving batadv3 as a backup interface with an up link bond1 (unregistering): Releasing backup interface batadv8 bond1 (unregistering): Released all slaves bond4 (unregistering): Releasing backup interface batadv2 bond4 (unregistering): Released all slaves bond1 (unregistering): Releasing backup interface batadv3 bond1 (unregistering): Released all slaves 8021q: adding VLAN 0 to HW filter on device batadv9 bond1: Enslaving batadv9 as a backup interface with an up link bond1 (unregistering): Releasing backup interface batadv9 Zero length message leads to an empty skb bond1 (unregistering): Released all slaves audit: type=1804 audit(1653551690.082:13): pid=14469 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir4117672911/syzkaller.3BiM0A/116/file0" dev="sda1" ino=14190 res=1 8021q: adding VLAN 0 to HW filter on device batadv4 bond1: Enslaving batadv4 as a backup interface with an up link 8021q: adding VLAN 0 to HW filter on device batadv3 bond1: Enslaving batadv3 as a backup interface with an up link bond1 (unregistering): Releasing backup interface batadv3 bond1 (unregistering): Released all slaves bond1 (unregistering): Releasing backup interface batadv4 bond1 (unregistering): Released all slaves audit: type=1804 audit(1653551690.442:14): pid=14614 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir4117672911/syzkaller.3BiM0A/117/file0" dev="sda1" ino=14174 res=1 audit: type=1804 audit(1653551690.492:15): pid=14642 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir4117672911/syzkaller.3BiM0A/118/file0" dev="sda1" ino=14174 res=1 audit: type=1804 audit(1653551690.542:16): pid=14682 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir4117672911/syzkaller.3BiM0A/119/file0" dev="sda1" ino=14174 res=1 8021q: adding VLAN 0 to HW filter on device batadv10 bond1: Enslaving batadv10 as a backup interface with an up link 8021q: adding VLAN 0 to HW filter on device batadv5 bond1: Enslaving batadv5 as a backup interface with an up link 8021q: adding VLAN 0 to HW filter on device batadv4 bond1: Enslaving batadv4 as a backup interface with an up link bond1 (unregistering): Releasing backup interface batadv10 bond1 (unregistering): Released all slaves bond1 (unregistering): Releasing backup interface batadv4 bond1 (unregistering): Released all slaves bond1 (unregistering): Releasing backup interface batadv5 bond1 (unregistering): Released all slaves audit: type=1804 audit(1653551690.812:17): pid=14840 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir4117672911/syzkaller.3BiM0A/120/file0" dev="sda1" ino=14174 res=1 audit: type=1804 audit(1653551690.902:18): pid=14844 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir4117672911/syzkaller.3BiM0A/121/file0" dev="sda1" ino=14185 res=1 8021q: adding VLAN 0 to HW filter on device batadv11 bond1: Enslaving batadv11 as a backup interface with an up link 8021q: adding VLAN 0 to HW filter on device batadv5 bond1: Enslaving batadv5 as a backup interface with an up link bond1 (unregistering): Releasing backup interface batadv11 bond1 (unregistering): Released all slaves bond1 (unregistering): Releasing backup interface batadv5 bond1 (unregistering): Released all slaves 8021q: adding VLAN 0 to HW filter on device batadv12 bond1: Enslaving batadv12 as a backup interface with an up link 8021q: adding VLAN 0 to HW filter on device batadv6 bond1: Enslaving batadv6 as a backup interface with an up link 8021q: adding VLAN 0 to HW filter on device batadv6 bond1: Enslaving batadv6 as a backup interface with an up link bond1 (unregistering): Releasing backup interface batadv12 bond1 (unregistering): Released all slaves 8021q: adding VLAN 0 to HW filter on device batadv13 bond1: Enslaving batadv13 as a backup interface with an up link 8021q: adding VLAN 0 to HW filter on device batadv7 bond2: Enslaving batadv7 as a backup interface with an up link 8021q: adding VLAN 0 to HW filter on device batadv7 bond2: Enslaving batadv7 as a backup interface with an up link bond1 (unregistering): Releasing backup interface batadv13 bond1 (unregistering): Released all slaves 8021q: adding VLAN 0 to HW filter on device batadv8 bond3: Enslaving batadv8 as a backup interface with an up link 8021q: adding VLAN 0 to HW filter on device batadv14 bond1: Enslaving batadv14 as a backup interface with an up link 8021q: adding VLAN 0 to HW filter on device batadv8 bond3: Enslaving batadv8 as a backup interface with an up link 8021q: adding VLAN 0 to HW filter on device batadv9 bond4: Enslaving batadv9 as a backup interface with an up link 8021q: adding VLAN 0 to HW filter on device batadv9 bond4: Enslaving batadv9 as a backup interface with an up link 8021q: adding VLAN 0 to HW filter on device batadv15 bond2: Enslaving batadv15 as a backup interface with an up link bond4 (unregistering): Releasing backup interface batadv9 bond4 (unregistering): Released all slaves 8021q: adding VLAN 0 to HW filter on device batadv16 bond3: Enslaving batadv16 as a backup interface with an up link 8021q: adding VLAN 0 to HW filter on device batadv10 bond4: Enslaving batadv10 as a backup interface with an up link 8021q: adding VLAN 0 to HW filter on device batadv10 bond5: Enslaving batadv10 as a backup interface with an up link bond4 (unregistering): Releasing backup interface batadv10 bond4 (unregistering): Released all slaves