BUG: sleeping function called from invalid context at mm/slab.h:419 in_atomic(): 1, irqs_disabled(): 1, pid: 11459, name: syz-executor.2 3 locks held by syz-executor.2/11459: #0: (&ep->mtx){+.+.}, at: [] SYSC_epoll_ctl fs/eventpoll.c:2080 [inline] #0: (&ep->mtx){+.+.}, at: [] SyS_epoll_ctl+0x516/0x2780 fs/eventpoll.c:2002 #1: (&dev->dev_mutex){+.+.}, at: [] v4l2_m2m_fop_poll+0x91/0x110 drivers/media/v4l2-core/v4l2-mem2mem.c:802 #2: (&(&q->done_lock)->rlock){....}, at: [] v4l2_m2m_poll+0x116/0x670 drivers/media/v4l2-core/v4l2-mem2mem.c:536 irq event stamp: 236 hardirqs last enabled at (235): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (235): [] _raw_spin_unlock_irqrestore+0x79/0xe0 kernel/locking/spinlock.c:192 hardirqs last disabled at (236): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (236): [] _raw_spin_lock_irqsave+0x66/0xc0 kernel/locking/spinlock.c:160 softirqs last enabled at (0): [] copy_process.part.0+0x12d0/0x71c0 kernel/fork.c:1734 softirqs last disabled at (0): [< (null)>] (null) Preemption disabled at: [< (null)>] (null) CPU: 1 PID: 11459 Comm: syz-executor.2 Not tainted 4.14.260-syzkaller #0 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+0x1b2/0x281 lib/dump_stack.c:58 ___might_sleep.cold+0x235/0x250 kernel/sched/core.c:6041 slab_pre_alloc_hook mm/slab.h:419 [inline] slab_alloc mm/slab.c:3376 [inline] kmem_cache_alloc+0x284/0x3c0 mm/slab.c:3550 ep_ptable_queue_proc+0x9e/0x370 fs/eventpoll.c:1255 poll_wait include/linux/poll.h:50 [inline] v4l2_m2m_poll+0x583/0x670 drivers/media/v4l2-core/v4l2-mem2mem.c:538 v4l2_m2m_fop_poll+0xa4/0x110 drivers/media/v4l2-core/v4l2-mem2mem.c:804 v4l2_poll+0x133/0x1d0 drivers/media/v4l2-core/v4l2-dev.c:342 ep_item_poll fs/eventpoll.c:885 [inline] ep_insert fs/eventpoll.c:1490 [inline] SYSC_epoll_ctl fs/eventpoll.c:2117 [inline] SyS_epoll_ctl+0x14af/0x2780 fs/eventpoll.c:2002 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7fb19c905e99 RSP: 002b:00007fb19b27b168 EFLAGS: 00000246 ORIG_RAX: 00000000000000e9 RAX: ffffffffffffffda RBX: 00007fb19ca18f60 RCX: 00007fb19c905e99 RDX: 0000000000000003 RSI: 0000000000000001 RDI: 0000000000000004 RBP: 00007fb19c95fff1 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000200000c0 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffea9bdcfaf R14: 00007fb19b27b300 R15: 0000000000022000 block nbd5: Attempted send on invalid socket print_req_error: I/O error, dev nbd5, sector 0 XFS (nbd5): SB validate failed with error -5. block nbd5: shutting down sockets overlayfs: fs on 'file0' does not support file handles, falling back to index=off. block nbd0: shutting down sockets overlayfs: fs on './file0' does not support file handles, falling back to index=off. block nbd5: shutting down sockets overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: fs on './file0' does not support file handles, falling back to index=off. block nbd5: shutting down sockets EXT4-fs (loop4): mounted filesystem without journal. Opts: max_dir_size_kb=0x0000000000000000,,errors=continue block nbd0: shutting down sockets block nbd5: shutting down sockets block nbd0: shutting down sockets overlayfs: fs on 'file0' does not support file handles, falling back to index=off. capability: warning: `syz-executor.3' uses deprecated v2 capabilities in a way that may be insecure EXT4-fs (loop4): mounted filesystem without journal. Opts: max_dir_size_kb=0x0000000000000000,,errors=continue overlayfs: failed to resolve './file1': -2 overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: fs on './file0' does not support file handles, falling back to index=off. EXT4-fs (loop4): mounted filesystem without journal. Opts: max_dir_size_kb=0x0000000000000000,,errors=continue EXT4-fs (loop4): mounted filesystem without journal. Opts: max_dir_size_kb=0x0000000000000000,,errors=continue ip6_tables: ip6tables: counters copy to user failed while replacing table Cannot find add_set index 0 as target Cannot find add_set index 0 as target Cannot find add_set index 0 as target Cannot find add_set index 0 as target BTRFS: device fsid f90cac8b-044b-4fa8-8bee-4b8d3da88dc2 devid 1 transid 7 /dev/loop3 BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents syz-executor.2 uses obsolete (PF_INET,SOCK_PACKET) BTRFS error (device loop3): bad tree block start 0 1052672 BTRFS error (device loop3): failed to read chunk root device syzkaller1 entered promiscuous mode BTRFS error (device loop3): open_ctree failed EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue BTRFS: device label :Ïé+áôåƒqÄz¦¯¤ˆÖXªQƒ¯þ0‰ devid 1099511627779 transid 7 /dev/loop5 BTRFS error (device loop5): superblock checksum mismatch BTRFS error (device loop5): open_ctree failed audit: type=1804 audit(1640796026.037:20): pid=12230 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir442678709/syzkaller.QuTZN0/101/bus" dev="sda1" ino=14287 res=1