====================================================== WARNING: possible circular locking dependency detected 4.14.111 #1 Not tainted ------------------------------------------------------ syz-executor.4/30225 is trying to acquire lock: ((&strp->work)){+.+.}, at: [] flush_work+0x84/0x730 kernel/workqueue.c:2878 but task is already holding lock: (sk_lock-AF_INET){+.+.}, at: [] lock_sock include/net/sock.h:1462 [inline] (sk_lock-AF_INET){+.+.}, at: [] kcm_attach net/kcm/kcmsock.c:1390 [inline] (sk_lock-AF_INET){+.+.}, at: [] kcm_attach_ioctl net/kcm/kcmsock.c:1490 [inline] (sk_lock-AF_INET){+.+.}, at: [] kcm_ioctl+0x35d/0x1120 net/kcm/kcmsock.c:1701 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (sk_lock-AF_INET){+.+.}: lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994 lock_sock_nested+0xbd/0x110 net/core/sock.c:2768 lock_sock include/net/sock.h:1462 [inline] strp_sock_lock+0x2e/0x40 net/strparser/strparser.c:451 do_strp_work net/strparser/strparser.c:415 [inline] strp_work+0x49/0x110 net/strparser/strparser.c:434 kobject: 'loop0' (ffff88806c6bc9e0): kobject_uevent_env process_one_work+0x868/0x1610 kernel/workqueue.c:2114 worker_thread+0x5d9/0x1050 kernel/workqueue.c:2248 kthread+0x31c/0x430 kernel/kthread.c:232 kobject: 'loop0' (ffff88806c6bc9e0): fill_kobj_path: path = '/devices/virtual/block/loop0' ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402 -> #0 ((&strp->work)){+.+.}: check_prev_add kernel/locking/lockdep.c:1901 [inline] check_prevs_add kernel/locking/lockdep.c:2018 [inline] validate_chain kernel/locking/lockdep.c:2460 [inline] __lock_acquire+0x2c89/0x45e0 kernel/locking/lockdep.c:3487 lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994 flush_work+0xae/0x730 kernel/workqueue.c:2881 __cancel_work_timer+0x2f0/0x480 kernel/workqueue.c:2956 cancel_work_sync+0x18/0x20 kernel/workqueue.c:2992 strp_done+0x58/0xe0 net/strparser/strparser.c:519 kcm_attach net/kcm/kcmsock.c:1429 [inline] kcm_attach_ioctl net/kcm/kcmsock.c:1490 [inline] kcm_ioctl+0x8d9/0x1120 net/kcm/kcmsock.c:1701 sock_do_ioctl+0x6a/0xb0 net/socket.c:974 sock_ioctl+0x2ac/0x470 net/socket.c:1071 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x7b9/0x1070 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(sk_lock-AF_INET); lock((&strp->work)); lock(sk_lock-AF_INET); lock((&strp->work)); *** DEADLOCK *** 1 lock held by syz-executor.4/30225: #0: (sk_lock-AF_INET){+.+.}, at: [] lock_sock include/net/sock.h:1462 [inline] #0: (sk_lock-AF_INET){+.+.}, at: [] kcm_attach net/kcm/kcmsock.c:1390 [inline] #0: (sk_lock-AF_INET){+.+.}, at: [] kcm_attach_ioctl net/kcm/kcmsock.c:1490 [inline] #0: (sk_lock-AF_INET){+.+.}, at: [] kcm_ioctl+0x35d/0x1120 net/kcm/kcmsock.c:1701 stack backtrace: CPU: 0 PID: 30225 Comm: syz-executor.4 Not tainted 4.14.111 #1 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x138/0x19c lib/dump_stack.c:53 print_circular_bug.isra.0.cold+0x1cc/0x28f kernel/locking/lockdep.c:1258 check_prev_add kernel/locking/lockdep.c:1901 [inline] check_prevs_add kernel/locking/lockdep.c:2018 [inline] validate_chain kernel/locking/lockdep.c:2460 [inline] __lock_acquire+0x2c89/0x45e0 kernel/locking/lockdep.c:3487 lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994 flush_work+0xae/0x730 kernel/workqueue.c:2881 __cancel_work_timer+0x2f0/0x480 kernel/workqueue.c:2956 cancel_work_sync+0x18/0x20 kernel/workqueue.c:2992 strp_done+0x58/0xe0 net/strparser/strparser.c:519 kcm_attach net/kcm/kcmsock.c:1429 [inline] kcm_attach_ioctl net/kcm/kcmsock.c:1490 [inline] kcm_ioctl+0x8d9/0x1120 net/kcm/kcmsock.c:1701 sock_do_ioctl+0x6a/0xb0 net/socket.c:974 sock_ioctl+0x2ac/0x470 net/socket.c:1071 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x7b9/0x1070 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x458c29 RSP: 002b:00007f7ffd41cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458c29 RDX: 0000000020000140 RSI: 00000000000089e0 RDI: 0000000000000006 RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7ffd41d6d4 R13: 00000000004c461a R14: 00000000004d7ec8 R15: 00000000ffffffff kobject: 'loop0' (ffff88806c6bc9e0): kobject_uevent_env kobject: 'loop0' (ffff88806c6bc9e0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (ffff88806c6bc9e0): kobject_uevent_env kobject: 'loop0' (ffff88806c6bc9e0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (ffff88806c6bc9e0): kobject_uevent_env kobject: 'loop0' (ffff88806c6bc9e0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (ffff88806c6bc9e0): kobject_uevent_env kobject: 'loop0' (ffff88806c6bc9e0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (ffff88806c6bc9e0): kobject_uevent_env kobject: 'loop0' (ffff88806c6bc9e0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (ffff88806c6bc9e0): kobject_uevent_env kobject: 'loop0' (ffff88806c6bc9e0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (ffff88806c6bc9e0): kobject_uevent_env kobject: 'loop0' (ffff88806c6bc9e0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (ffff88806c6bc9e0): kobject_uevent_env kobject: 'loop0' (ffff88806c6bc9e0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (ffff88806c6bc9e0): kobject_uevent_env kobject: 'loop0' (ffff88806c6bc9e0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (ffff88806c6bc9e0): kobject_uevent_env kobject: 'loop0' (ffff88806c6bc9e0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (ffff88806c6bc9e0): kobject_uevent_env kobject: 'loop0' (ffff88806c6bc9e0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (ffff88806c6bc9e0): kobject_uevent_env kobject: 'loop0' (ffff88806c6bc9e0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (ffff88806c6bc9e0): kobject_uevent_env kobject: 'loop0' (ffff88806c6bc9e0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (ffff88806c6bc9e0): kobject_uevent_env kobject: 'loop0' (ffff88806c6bc9e0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (ffff88806c6bc9e0): kobject_uevent_env kobject: 'loop0' (ffff88806c6bc9e0): fill_kobj_path: path = '/devices/virtual/block/loop0' audit: type=1804 audit(1555246593.415:200): pid=30488 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="memory.events" dev="sda1" ino=18002 res=1 kobject: 'loop0' (ffff88806c6bc9e0): kobject_uevent_env kobject: 'loop0' (ffff88806c6bc9e0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (ffff88806c6bc9e0): kobject_uevent_env kobject: 'loop0' (ffff88806c6bc9e0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'nr0' (ffff88806995bcf0): kobject_add_internal: parent: 'net', set: 'devices' kobject: 'nr0' (ffff88806995bcf0): kobject_uevent_env kobject: 'nr0' (ffff88806995bcf0): fill_kobj_path: path = '/devices/virtual/net/nr0' kobject: 'queues' (ffff8880a22f5a48): kobject_add_internal: parent: 'nr0', set: '' kobject: 'queues' (ffff8880a22f5a48): kobject_uevent_env kobject: 'queues' (ffff8880a22f5a48): kobject_uevent_env: filter function caused the event to drop! kobject: 'rx-0' (ffff88804c3c6d50): kobject_add_internal: parent: 'queues', set: 'queues' kobject: 'rx-0' (ffff88804c3c6d50): kobject_uevent_env kobject: 'rx-0' (ffff88804c3c6d50): fill_kobj_path: path = '/devices/virtual/net/nr0/queues/rx-0' kobject: 'tx-0' (ffff88804bb84298): kobject_add_internal: parent: 'queues', set: 'queues' kobject: 'tx-0' (ffff88804bb84298): kobject_uevent_env kobject: 'tx-0' (ffff88804bb84298): fill_kobj_path: path = '/devices/virtual/net/nr0/queues/tx-0' kobject: 'batman_adv' (ffff8880688d0b80): kobject_add_internal: parent: 'nr0', set: '' kobject: 'batman_adv' (ffff8880688d0b80): kobject_uevent_env kobject: 'batman_adv' (ffff8880688d0b80): kobject_uevent_env: filter function caused the event to drop! kobject: 'batman_adv' (ffff8880688d0b80): kobject_cleanup, parent (null) kobject: 'batman_adv' (ffff8880688d0b80): calling ktype release kobject: (ffff8880688d0b80): dynamic_kobj_release kobject: 'batman_adv': free name kobject: 'rx-0' (ffff88804c3c6d50): kobject_cleanup, parent ffff8880a22f5a48 kobject: 'rx-0' (ffff88804c3c6d50): auto cleanup 'remove' event kobject: 'rx-0' (ffff88804c3c6d50): kobject_uevent_env kobject: 'rx-0' (ffff88804c3c6d50): fill_kobj_path: path = '/devices/virtual/net/nr0/queues/rx-0' kobject: 'rx-0' (ffff88804c3c6d50): auto cleanup kobject_del kobject: 'rx-0' (ffff88804c3c6d50): calling ktype release kobject: 'rx-0': free name kobject: 'tx-0' (ffff88804bb84298): kobject_cleanup, parent ffff8880a22f5a48 kobject: 'tx-0' (ffff88804bb84298): auto cleanup 'remove' event kobject: 'tx-0' (ffff88804bb84298): kobject_uevent_env kobject: 'tx-0' (ffff88804bb84298): fill_kobj_path: path = '/devices/virtual/net/nr0/queues/tx-0' kobject: 'tx-0' (ffff88804bb84298): auto cleanup kobject_del kobject: 'tx-0' (ffff88804bb84298): calling ktype release kobject: 'tx-0': free name kobject: 'queues' (ffff8880a22f5a48): kobject_cleanup, parent (null) kobject: 'queues' (ffff8880a22f5a48): calling ktype release kobject: 'queues' (ffff8880a22f5a48): kset_release kobject: 'queues': free name kobject: 'nr0' (ffff88806995bcf0): kobject_uevent_env kobject: 'nr0' (ffff88806995bcf0): fill_kobj_path: path = '/devices/virtual/net/nr0' kobject: 'nr0' (ffff88806995bcf0): kobject_cleanup, parent (null) kobject: 'nr0' (ffff88806995bcf0): calling ktype release kobject: 'nr0': free name kobject: 'nr0' (ffff88804cc8bd30): kobject_add_internal: parent: 'net', set: 'devices' kobject: 'nr0' (ffff88804cc8bd30): kobject_uevent_env kobject: 'nr0' (ffff88804cc8bd30): fill_kobj_path: path = '/devices/virtual/net/nr0' kobject: 'queues' (ffff88806e386b48): kobject_add_internal: parent: 'nr0', set: '' kobject: 'queues' (ffff88806e386b48): kobject_uevent_env kobject: 'queues' (ffff88806e386b48): kobject_uevent_env: filter function caused the event to drop! kobject: 'rx-0' (ffff88804d6d6d90): kobject_add_internal: parent: 'queues', set: 'queues' kobject: 'rx-0' (ffff88804d6d6d90): kobject_uevent_env kobject: 'rx-0' (ffff88804d6d6d90): fill_kobj_path: path = '/devices/virtual/net/nr0/queues/rx-0' kobject: 'tx-0' (ffff88803b404518): kobject_add_internal: parent: 'queues', set: 'queues' kobject: 'tx-0' (ffff88803b404518): kobject_uevent_env kobject: 'tx-0' (ffff88803b404518): fill_kobj_path: path = '/devices/virtual/net/nr0/queues/tx-0' kobject: 'batman_adv' (ffff888066df8c00): kobject_add_internal: parent: 'nr0', set: '' kobject: 'batman_adv' (ffff888066df8c00): kobject_uevent_env audit: type=1800 audit(1555246596.285:201): pid=30566 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="collect_data" cause="failed" comm="syz-executor.2" name="bus" dev="sda1" ino=16637 res=0 kobject: 'batman_adv' (ffff888066df8c00): kobject_uevent_env: filter function caused the event to drop! kobject: 'batman_adv' (ffff888066df8c00): kobject_cleanup, parent (null) kobject: 'batman_adv' (ffff888066df8c00): calling ktype release kobject: (ffff888066df8c00): dynamic_kobj_release kobject: 'batman_adv': free name kobject: 'rx-0' (ffff88804d6d6d90): kobject_cleanup, parent ffff88806e386b48 kobject: 'rx-0' (ffff88804d6d6d90): auto cleanup 'remove' event kobject: 'rx-0' (ffff88804d6d6d90): kobject_uevent_env kobject: 'rx-0' (ffff88804d6d6d90): fill_kobj_path: path = '/devices/virtual/net/nr0/queues/rx-0' kobject: 'rx-0' (ffff88804d6d6d90): auto cleanup kobject_del kobject: 'rx-0' (ffff88804d6d6d90): calling ktype release kobject: 'rx-0': free name kobject: 'tx-0' (ffff88803b404518): kobject_cleanup, parent ffff88806e386b48 kobject: 'tx-0' (ffff88803b404518): auto cleanup 'remove' event kobject: 'tx-0' (ffff88803b404518): kobject_uevent_env kobject: 'tx-0' (ffff88803b404518): fill_kobj_path: path = '/devices/virtual/net/nr0/queues/tx-0' kobject: 'tx-0' (ffff88803b404518): auto cleanup kobject_del kobject: 'tx-0' (ffff88803b404518): calling ktype release kobject: 'tx-0': free name kobject: 'queues' (ffff88806e386b48): kobject_cleanup, parent (null) kobject: 'queues' (ffff88806e386b48): calling ktype release kobject: 'queues' (ffff88806e386b48): kset_release kobject: 'queues': free name kobject: 'nr0' (ffff88804cc8bd30): kobject_uevent_env kobject: 'nr0' (ffff88804cc8bd30): fill_kobj_path: path = '/devices/virtual/net/nr0' kobject: 'nr0' (ffff88804cc8bd30): kobject_cleanup, parent (null) kobject: 'nr0' (ffff88804cc8bd30): calling ktype release kobject: 'nr0': free name kobject: 'loop0' (ffff88806c6bc9e0): kobject_uevent_env kobject: 'loop0' (ffff88806c6bc9e0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (ffff88806c6bc9e0): kobject_uevent_env kobject: 'loop0' (ffff88806c6bc9e0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (ffff88806c6bc9e0): kobject_uevent_env kobject: 'loop0' (ffff88806c6bc9e0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (ffff88806c6bc9e0): kobject_uevent_env kobject: 'loop0' (ffff88806c6bc9e0): fill_kobj_path: path = '/devices/virtual/block/loop0' audit: type=1800 audit(1555246597.525:202): pid=30610 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="collect_data" cause="failed" comm="syz-executor.2" name="bus" dev="sda1" ino=16677 res=0 kobject: 'loop0' (ffff88806c6bc9e0): kobject_uevent_env kobject: 'loop0' (ffff88806c6bc9e0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (ffff88806c6bc9e0): kobject_uevent_env kobject: 'loop0' (ffff88806c6bc9e0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (ffff88806c6bc9e0): kobject_uevent_env kobject: 'loop0' (ffff88806c6bc9e0): fill_kobj_path: path = '/devices/virtual/block/loop0'