[ 34.998575] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 35.006836] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 35.016260] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 35.024119] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 35.150074] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 35.210935] syz-executor.0 (7991) used greatest stack depth: 23784 bytes left [ 35.527481] can: request_module (can-proto-0) failed. [ 35.537005] can: request_module (can-proto-0) failed. [ 35.546528] can: request_module (can-proto-0) failed. [ 45.415101] unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 [ 55.442621] unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Warning: Permanently added '10.128.10.13' (ECDSA) to the list of known hosts. [ 55.999280] BUG: sleeping function called from invalid context at mm/slab.h:419 [ 56.007130] in_atomic(): 1, irqs_disabled(): 1, pid: 8318, name: syz-executor584 [ 56.014644] 3 locks held by syz-executor584/8318: [ 56.019474] #0: (&ep->mtx){+.+.}, at: [] SyS_epoll_ctl+0x4bc/0x27e0 [ 56.027604] #1: (&dev->dev_mutex){+.+.}, at: [] v4l2_m2m_fop_poll+0x8c/0x100 [ 56.036532] #2: (&(&q->done_lock)->rlock){....}, at: [] v4l2_m2m_poll+0x103/0x650 [ 56.045900] irq event stamp: 7682 [ 56.049328] hardirqs last enabled at (7681): [] _raw_spin_unlock_irqrestore+0x82/0xd0 [ 56.059451] hardirqs last disabled at (7682): [] _raw_spin_lock_irqsave+0x74/0xd0 [ 56.068623] softirqs last enabled at (4364): [] __do_softirq+0x644/0x9a2 [ 56.077248] softirqs last disabled at (4343): [] irq_exit+0x15f/0x1a0 [ 56.085457] Preemption disabled at: [ 56.085466] [] v4l2_m2m_poll+0x103/0x650 [ 56.094751] CPU: 1 PID: 8318 Comm: syz-executor584 Not tainted 4.14.265-syzkaller #0 [ 56.102609] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.111936] Call Trace: [ 56.114672] dump_stack+0x14b/0x1e7 [ 56.118273] ? v4l2_m2m_poll+0x103/0x650 [ 56.122316] ___might_sleep.cold.19+0x1f1/0x265 [ 56.126961] __might_sleep+0x93/0xb0 [ 56.130649] kmem_cache_alloc+0x2a1/0x3e0 [ 56.134778] ep_ptable_queue_proc+0xbd/0x3d0 [ 56.139163] v4l2_m2m_poll+0x4c5/0x650 [ 56.143025] v4l2_m2m_fop_poll+0x9a/0x100 [ 56.147160] ? v4l2_m2m_ctx_release+0x30/0x30 [ 56.151633] v4l2_poll+0x122/0x1f0 [ 56.155149] SyS_epoll_ctl+0x13c6/0x27e0 [ 56.159185] ? SyS_epoll_create+0x20/0x20 [ 56.163304] ? __fd_install+0x1f0/0x5b0 [ 56.167249] ? get_unused_fd_flags+0xd0/0xd0 [ 56.171630] ? anon_inodefs_mount+0x30/0x30 [ 56.175924] ? __lockdep_init_map+0x105/0x550 [ 56.180400] ? ep_send_events_proc+0x9c0/0x9c0 [ 56.184965] ? do_syscall_64+0x4c/0x5b0 [ 56.188909] ? SyS_epoll_create+0x20/0x20 [ 56.193029] do_syscall_64+0x1c7/0x5b0 [ 56.196885] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 56.201707] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 56.206879] RIP: 0033:0x7fbca734fd09 [ 56.210571] RSP: 002b:00007fffac9b37d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e9 [ 56.218254] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbca734fd09 [ 56.225495] RDX: 0000000000000003 RSI: 0000000000000001 RDI: 0000000000000004 [ 56.232739] RBP: 00007fbca7313eb0 R08: 0000000000000000 R09: 0000000000000000 [ 56.239979] R10: 00000000200000c0 R11: 0000000000000246 R12: 00007fbca7313f40 [ 56.247491] R13: 000000000000000