====================================================== WARNING: possible circular locking dependency detected 4.14.290-syzkaller #0 Not tainted ------------------------------------------------------ kworker/u4:3/640 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: -> #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 (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 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/u4:3/640: #0: ("%s""kstrp"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2088 #1: ((&strp->work)){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2092 stack backtrace: CPU: 0 PID: 640 Comm: kworker/u4:3 Not tainted 4.14.290-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 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 md: md1 stopped. netlink: 72 bytes leftover after parsing attributes in process `syz-executor.0'. md: md1 stopped. 8021q: adding VLAN 0 to HW filter on device team0 BTRFS: device fsid f90cac8b-044b-4fa8-8bee-4b8d3da88dc2 devid 1 transid 7 /dev/loop4 bond0: Enslaving team0 as an active interface with an up link netlink: 72 bytes leftover after parsing attributes in process `syz-executor.0'. syz-executor.1 (10659) used greatest stack depth: 24064 bytes left BTRFS info (device loop4): disk space caching is enabled BTRFS info (device loop4): has skinny extents md: md1 stopped. netlink: 72 bytes leftover after parsing attributes in process `syz-executor.0'. md: md1 stopped. netlink: 36 bytes leftover after parsing attributes in process `syz-executor.3'. ntfs: (device loop2): is_boot_sector_ntfs(): Invalid boot sector checksum. ntfs: (device loop2): read_ntfs_boot_sector(): Primary boot sector is invalid. ntfs: (device loop2): read_ntfs_boot_sector(): Mount option errors=recover not used. Aborting without trying to recover. ntfs: (device loop2): ntfs_fill_super(): Not an NTFS volume. netlink: 36 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 36 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 36 bytes leftover after parsing attributes in process `syz-executor.3'. BTRFS info (device loop4): disk space caching is enabled BTRFS info (device loop4): has skinny extents BTRFS info (device loop4): disk space caching is enabled BTRFS info (device loop4): has skinny extents BTRFS error (device loop4): open_ctree failed audit: type=1107 audit(1659592827.132:3): pid=11096 uid=0 auid=4294967295 ses=4294967295 msg='v' audit: type=1107 audit(1659592827.172:4): pid=11101 uid=0 auid=4294967295 ses=4294967295 msg=' ' audit: type=1107 audit(1659592828.212:5): pid=11184 uid=0 auid=4294967295 ses=4294967295 msg=' ' unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 batman_adv: Cannot find parent device device gretap1 entered promiscuous mode EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue batman_adv: Cannot find parent device device gretap1 entered promiscuous mode batman_adv: Cannot find parent device device gretap1 entered promiscuous mode batman_adv: Cannot find parent device device gretap1 entered promiscuous mode EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue