audit: type=1400 audit(1513605075.612:13): avc: denied { net_admin } for pid=3405 comm="syz-executor1" capability=12 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1 ============================================ WARNING: possible recursive locking detected 4.15.0-rc2-mm1+ #39 Not tainted -------------------------------------------- syz-executor1/3407 is trying to acquire lock: audit: type=1400 audit(1513605075.640:14): avc: denied { net_raw } for pid=3430 comm="syz-executor5" capability=13 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1 (rtnl_mutex){+.+.}, at: [<0000000014969a93>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 but task is already holding lock: (rtnl_mutex){+.+.}, at: [<0000000014969a93>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(rtnl_mutex); lock(rtnl_mutex); *** DEADLOCK *** May be due to missing lock nesting notation 1 lock held by syz-executor1/3407: #0: (rtnl_mutex){+.+.}, at: [<0000000014969a93>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 stack backtrace: CPU: 1 PID: 3407 Comm: syz-executor1 Not tainted 4.15.0-rc2-mm1+ #39 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+0x194/0x257 lib/dump_stack.c:53 print_deadlock_bug kernel/locking/lockdep.c:1809 [inline] check_deadlock kernel/locking/lockdep.c:1856 [inline] validate_chain kernel/locking/lockdep.c:2457 [inline] __lock_acquire+0x11cf/0x47f0 kernel/locking/lockdep.c:3500 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4004 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 tun_free_netdev+0x158/0x1f0 drivers/net/tun.c:2068 register_netdevice+0x97b/0x1010 net/core/dev.c:7774 tun_set_iff drivers/net/tun.c:2389 [inline] __tun_chr_ioctl+0x1ca3/0x3f10 drivers/net/tun.c:2613 tun_chr_ioctl+0x2a/0x40 drivers/net/tun.c:2866 vfs_ioctl fs/ioctl.c:46 [inline] do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:686 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 do_syscall_64+0x26c/0x920 arch/x86/entry/common.c:285 entry_SYSCALL64_slow_path+0x25/0x25 RIP: 0033:0x452a09 RSP: 002b:00007f9fc444bc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452a09 RDX: 0000000020533000 RSI: 00000000400454ca RDI: 0000000000000018 RBP: 00000000000002eb R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f16a8 R13: 00000000ffffffff R14: 00007f9fc444c6d4 R15: 0000000000000000 audit: type=1400 audit(1513605076.301:15): avc: denied { map } for pid=3441 comm="syz-executor3" path="/dev/binder3" dev="devtmpfs" ino=1188 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:device_t:s0 tclass=chr_file permissive=1 binder: 3441:3443 unknown command 2003446405 binder: 3441:3443 ioctl c0306201 20006000 returned -22 binder: 3441:3443 got transaction with invalid offsets size, 68 binder: 3441:3443 transaction failed 29201/-22, size 0-68 line 2983 binder_alloc: binder_alloc_mmap_handler: 3441 20000000-20002000 already mapped failed -16 binder: BINDER_SET_CONTEXT_MGR already set binder: 3441:3443 ioctl 40046207 0 returned -16 binder: 3441:3443 unknown command 2003446405 binder: 3441:3443 ioctl c0306201 20006000 returned -22 binder_alloc: 3441: binder_alloc_buf, no vma binder: 3441:3444 transaction failed 29189/-3, size 0-68 line 2947 binder: undelivered TRANSACTION_ERROR: 29201 binder: undelivered TRANSACTION_ERROR: 29189 kvm: KVM_SET_TSS_ADDR need to be called before entering vcpu audit: type=1400 audit(1513605076.303:16): avc: denied { set_context_mgr } for pid=3441 comm="syz-executor3" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=binder permissive=1 audit: type=1400 audit(1513605076.305:17): avc: denied { call } for pid=3441 comm="syz-executor3" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=binder permissive=1 netlink: 3 bytes leftover after parsing attributes in process `syz-executor5'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor5'.