[ 29.580409] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 29.588331] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 29.598086] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 29.604986] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 29.720790] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 29.791217] syz-executor.0 (7947) used greatest stack depth: 23784 bytes left [ 30.193023] can: request_module (can-proto-0) failed. [ 30.202685] can: request_module (can-proto-0) failed. [ 30.211803] can: request_module (can-proto-0) failed. [ 39.975236] unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Warning: Permanently added '10.128.1.117' (ECDSA) to the list of known hosts. [ 49.946850] BUG: sleeping function called from invalid context at mm/slab.h:419 [ 49.954416] in_atomic(): 1, irqs_disabled(): 1, pid: 8279, name: syz-executor388 [ 49.961932] 3 locks held by syz-executor388/8279: [ 49.966750] #0: (&ep->mtx){+.+.}, at: [] SyS_epoll_ctl+0x4bc/0x27e0 [ 49.974901] #1: (&dev->dev_mutex){+.+.}, at: [] v4l2_m2m_fop_poll+0x8c/0x100 [ 49.983847] #2: (&(&q->done_lock)->rlock){....}, at: [] v4l2_m2m_poll+0x103/0x650 [ 49.992658] unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 [ 49.993467] irq event stamp: 6650 [ 50.005217] hardirqs last enabled at (6649): [] _raw_spin_unlock_irqrestore+0x82/0xd0 [ 50.015001] hardirqs last disabled at (6650): [] _raw_spin_lock_irqsave+0x74/0xd0 [ 50.024370] softirqs last enabled at (5268): [] __do_softirq+0x644/0x9a2 [ 50.033365] softirqs last disabled at (5251): [] irq_exit+0x15f/0x1a0 [ 50.041493] Preemption disabled at: [ 50.041505] [] v4l2_m2m_poll+0x103/0x650 [ 50.050841] CPU: 0 PID: 8279 Comm: syz-executor388 Not tainted 4.14.271-syzkaller #0 [ 50.058706] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.068121] Call Trace: [ 50.070687] dump_stack+0x14b/0x1e7 [ 50.074288] ? v4l2_m2m_poll+0x103/0x650 [ 50.078326] ___might_sleep.cold.19+0x1f1/0x265 [ 50.082976] __might_sleep+0x93/0xb0 [ 50.086677] kmem_cache_alloc+0x2a1/0x3e0 [ 50.090992] ep_ptable_queue_proc+0xbd/0x3d0 [ 50.095384] v4l2_m2m_poll+0x4c5/0x650 [ 50.099248] v4l2_m2m_fop_poll+0x9a/0x100 [ 50.103371] ? v4l2_m2m_ctx_release+0x30/0x30 [ 50.108100] v4l2_poll+0x122/0x1f0 [ 50.111808] SyS_epoll_ctl+0x13c6/0x27e0 [ 50.115867] ? SyS_epoll_create+0x20/0x20 [ 50.119990] ? __fd_install+0x1f0/0x5b0 [ 50.124042] ? get_unused_fd_flags+0xd0/0xd0 [ 50.128450] ? anon_inodefs_mount+0x30/0x30 [ 50.132782] ? __lockdep_init_map+0x105/0x550 [ 50.137289] ? ep_send_events_proc+0x9c0/0x9c0 [ 50.141946] ? do_syscall_64+0x4c/0x5b0 [ 50.146010] ? SyS_epoll_create+0x20/0x20 [ 50.150270] do_syscall_64+0x1c7/0x5b0 [ 50.154236] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 50.159586] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 50.164845] RIP: 0033:0x7f2a339ecd09 [ 50.168532] RSP: 002b:00007ffe455f0718 EFLAGS: 00000246 ORIG_RAX: 00000000000000e9 [ 50.176224] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2a339ecd09 [ 50.183584] RDX: 0000000000000003 RSI: 0000000000000001 RDI: 0000000000000004 [ 50.190935] RBP: 00007f2a339b0eb0 R08: 0000000000000000 R09: 0000000000000000