BUG: sleeping function called from invalid context at mm/slab.h:422 in_atomic(): 1, irqs_disabled(): 1, pid: 10763, name: syz-executor.3 3 locks held by syz-executor.3/10763: #0: 000000007a4c88bf (&ep->mtx){+.+.}, at: __do_sys_epoll_ctl fs/eventpoll.c:2075 [inline] #0: 000000007a4c88bf (&ep->mtx){+.+.}, at: __se_sys_epoll_ctl+0x5d2/0x2b90 fs/eventpoll.c:1997 #1: 000000009349ccb6 (&dev->dev_mutex){+.+.}, at: v4l2_m2m_fop_poll+0x91/0x110 drivers/media/v4l2-core/v4l2-mem2mem.c:1056 #2: 000000008e9e37b6 (&(&q->done_lock)->rlock){....}, at: v4l2_m2m_poll+0x140/0x720 drivers/media/v4l2-core/v4l2-mem2mem.c:623 irq event stamp: 410 hardirqs last enabled at (409): [] trace_hardirqs_on_thunk+0x1a/0x1c hardirqs last disabled at (410): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (410): [] _raw_spin_lock_irqsave+0x66/0xc0 kernel/locking/spinlock.c:152 softirqs last enabled at (408): [] __do_softirq+0x678/0x980 kernel/softirq.c:318 softirqs last disabled at (277): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (277): [] irq_exit+0x215/0x260 kernel/softirq.c:412 Preemption disabled at: [<0000000000000000>] (null) CPU: 0 PID: 10763 Comm: syz-executor.3 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 ___might_sleep.cold+0x235/0x250 kernel/sched/core.c:6192 slab_pre_alloc_hook mm/slab.h:422 [inline] slab_alloc mm/slab.c:3383 [inline] kmem_cache_alloc+0x26d/0x370 mm/slab.c:3557 ep_ptable_queue_proc+0xaf/0x390 fs/eventpoll.c:1242 poll_wait include/linux/poll.h:51 [inline] v4l2_m2m_poll+0x633/0x720 drivers/media/v4l2-core/v4l2-mem2mem.c:625 v4l2_m2m_fop_poll+0xa4/0x110 drivers/media/v4l2-core/v4l2-mem2mem.c:1058 v4l2_poll+0x146/0x1f0 drivers/media/v4l2-core/v4l2-dev.c:350 vfs_poll include/linux/poll.h:90 [inline] ep_item_poll+0x14a/0x3e0 fs/eventpoll.c:890 ep_insert fs/eventpoll.c:1479 [inline] __do_sys_epoll_ctl fs/eventpoll.c:2112 [inline] __se_sys_epoll_ctl+0x1b04/0x2b90 fs/eventpoll.c:1997 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f0861d0fe99 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f0860685168 EFLAGS: 00000246 ORIG_RAX: 00000000000000e9 RAX: ffffffffffffffda RBX: 00007f0861e22f60 RCX: 00007f0861d0fe99 RDX: 0000000000000003 RSI: 0000000000000001 RDI: 0000000000000004 RBP: 00007f0861d69ff1 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000200000c0 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc8693e17f R14: 00007f0860685300 R15: 0000000000022000 kvm: vcpu 0: requested 128 ns lapic timer period limited to 200000 ns ntfs: (device loop4): read_ntfs_boot_sector(): Primary boot sector is invalid. ntfs: (device loop4): read_ntfs_boot_sector(): Mount option errors=recover not used. Aborting without trying to recover. ntfs: (device loop4): ntfs_fill_super(): Not an NTFS volume. XFS (loop1): Invalid device [./file0], error=-2 xt_TCPMSS: Only works on TCP SYN packets xt_TCPMSS: Only works on TCP SYN packets kvm: vcpu 0: requested 128 ns lapic timer period limited to 200000 ns XFS (loop1): Invalid device [./file0], error=-2 ntfs: (device loop4): read_ntfs_boot_sector(): Primary boot sector is invalid. ntfs: (device loop4): read_ntfs_boot_sector(): Mount option errors=recover not used. Aborting without trying to recover. ntfs: (device loop4): ntfs_fill_super(): Not an NTFS volume. XFS (loop1): Invalid device [./file0], error=-2 xt_TCPMSS: Only works on TCP SYN packets XFS (loop1): Invalid device [./file0], error=-2 xt_TCPMSS: Only works on TCP SYN packets kvm: vcpu 0: requested 128 ns lapic timer period limited to 200000 ns ntfs: (device loop4): read_ntfs_boot_sector(): Primary boot sector is invalid. squashfs: SQUASHFS error: Can't find a SQUASHFS superblock on loop0 device ip_vti0 entered promiscuous mode device vlan2 entered promiscuous mode device ip_vti0 left promiscuous mode kauditd_printk_skb: 2 callbacks suppressed audit: type=1800 audit(1641336795.354:8): pid=11020 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="bus" dev="sda1" ino=14142 res=0 device ip_vti0 entered promiscuous mode audit: type=1800 audit(1641336796.604:9): pid=11110 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="bus" dev="sda1" ino=14149 res=0 device vlan2 entered promiscuous mode device ip_vti0 left promiscuous mode audit: type=1800 audit(1641336798.545:10): pid=11157 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="bus" dev="sda1" ino=14149 res=0 audit: type=1800 audit(1641336800.085:11): pid=11183 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="bus" dev="sda1" ino=14170 res=0 device ip_vti0 entered promiscuous mode device vlan2 entered promiscuous mode device ip_vti0 left promiscuous mode