BUG: sleeping function called from invalid context at mm/slab.h:419 in_atomic(): 1, irqs_disabled(): 1, pid: 11005, name: syz-executor.3 3 locks held by syz-executor.3/11005: #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: 304 hardirqs last enabled at (303): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (303): [] _raw_spin_unlock_irqrestore+0x79/0xe0 kernel/locking/spinlock.c:192 hardirqs last disabled at (304): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (304): [] _raw_spin_lock_irqsave+0x66/0xc0 kernel/locking/spinlock.c:160 softirqs last enabled at (284): [] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (261): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (261): [] irq_exit+0x193/0x240 kernel/softirq.c:409 Preemption disabled at: [< (null)>] (null) CPU: 1 PID: 11005 Comm: syz-executor.3 Not tainted 4.14.258-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: 0033:0x7f240865ce99 RSP: 002b:00007f2406fd2168 EFLAGS: 00000246 ORIG_RAX: 00000000000000e9 RAX: ffffffffffffffda RBX: 00007f240876ff60 RCX: 00007f240865ce99 RDX: 0000000000000003 RSI: 0000000000000001 RDI: 0000000000000004 RBP: 00007f24086b6ff1 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000200000c0 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe3cd1589f R14: 00007f2406fd2300 R15: 0000000000022000 EXT4-fs (loop0): Quota format mount options ignored when QUOTA feature is enabled EXT4-fs (loop0): ext4_check_descriptors: Checksum for group 0 failed (60935!=0) EXT4-fs (loop0): orphan cleanup on readonly fs EXT4-fs error (device loop0): ext4_orphan_get:1265: comm syz-executor.0: bad orphan inode 33554432 EXT4-fs (loop0): mounted filesystem without journal. Opts: jqfmt=vfsv1,,errors=continue vhci_hcd: invalid port number 0 vhci_hcd: invalid port number 0 EXT4-fs (loop0): Quota format mount options ignored when QUOTA feature is enabled EXT4-fs (loop0): ext4_check_descriptors: Checksum for group 0 failed (60935!=0) EXT4-fs (loop0): orphan cleanup on readonly fs vhci_hcd: invalid port number 0 EXT4-fs error (device loop0): ext4_orphan_get:1265: comm syz-executor.0: bad orphan inode 33554432 EXT4-fs (loop0): mounted filesystem without journal. Opts: jqfmt=vfsv1,,errors=continue EXT4-fs (loop0): Quota format mount options ignored when QUOTA feature is enabled vhci_hcd: invalid port number 0 EXT4-fs (loop0): ext4_check_descriptors: Checksum for group 0 failed (60935!=0) EXT4-fs (loop0): orphan cleanup on readonly fs EXT4-fs error (device loop0): ext4_orphan_get:1265: comm syz-executor.0: bad orphan inode 33554432 EXT4-fs (loop0): mounted filesystem without journal. Opts: jqfmt=vfsv1,,errors=continue EXT4-fs (loop0): Quota format mount options ignored when QUOTA feature is enabled EXT4-fs (loop0): ext4_check_descriptors: Checksum for group 0 failed (60935!=0) EXT4-fs (loop0): orphan cleanup on readonly fs EXT4-fs error (device loop0): ext4_orphan_get:1265: comm syz-executor.0: bad orphan inode 33554432 EXT4-fs (loop0): mounted filesystem without journal. Opts: jqfmt=vfsv1,,errors=continue netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. IPVS: ftp: loaded support on port[0] = 21 EXT4-fs (sda1): Unrecognized mount option "f" or missing value netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. EXT4-fs (sda1): Unrecognized mount option "f" or missing value EXT4-fs (sda1): Unrecognized mount option "f" or missing value EXT4-fs (sda1): Unrecognized mount option "f" or missing value UDF-fs: error (device loop5): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop5): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop5): udf_load_vrs: No anchor found print_req_error: I/O error, dev loop2, sector 0 UDF-fs: Scanning with blocksize 512 failed print_req_error: I/O error, dev loop2, sector 0 Buffer I/O error on dev loop2, logical block 0, async page read