BUG: sleeping function called from invalid context at mm/slab.h:419 in_atomic(): 1, irqs_disabled(): 1, pid: 11521, name: syz-executor.5 3 locks held by syz-executor.5/11521: #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: 332 hardirqs last enabled at (331): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (331): [] _raw_spin_unlock_irqrestore+0x79/0xe0 kernel/locking/spinlock.c:192 hardirqs last disabled at (332): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (332): [] _raw_spin_lock_irqsave+0x66/0xc0 kernel/locking/spinlock.c:160 softirqs last enabled at (194): [] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (175): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (175): [] irq_exit+0x193/0x240 kernel/softirq.c:409 Preemption disabled at: [< (null)>] (null) CPU: 0 PID: 11521 Comm: syz-executor.5 Not tainted 4.14.259-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: 0033:0x7fbb68f78e99 RSP: 002b:00007fbb678ee168 EFLAGS: 00000246 ORIG_RAX: 00000000000000e9 RAX: ffffffffffffffda RBX: 00007fbb6908bf60 RCX: 00007fbb68f78e99 RDX: 0000000000000003 RSI: 0000000000000001 RDI: 0000000000000004 RBP: 00007fbb68fd2ff1 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000200000c0 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc1b62020f R14: 00007fbb678ee300 R15: 0000000000022000 BUG: sleeping function called from invalid context at mm/slab.h:419 in_atomic(): 1, irqs_disabled(): 1, pid: 11545, name: syz-executor.5 3 locks held by syz-executor.5/11545: #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: 252 hardirqs last enabled at (251): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (251): [] _raw_spin_unlock_irqrestore+0x79/0xe0 kernel/locking/spinlock.c:192 hardirqs last disabled at (252): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (252): [] _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: 11545 Comm: syz-executor.5 Tainted: G W 4.14.259-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: 0033:0x7fbb68f78e99 RSP: 002b:00007fbb678ee168 EFLAGS: 00000246 ORIG_RAX: 00000000000000e9 RAX: ffffffffffffffda RBX: 00007fbb6908bf60 RCX: 00007fbb68f78e99 RDX: 0000000000000003 RSI: 0000000000000001 RDI: 0000000000000004 RBP: 00007fbb68fd2ff1 R08: 0000000000000000 R09: 0000000000000000 overlayfs: filesystem on './bus' not supported as upperdir R10: 00000000200000c0 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc1b62020f R14: 00007fbb678ee300 R15: 0000000000022000 overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir netlink: 4 bytes leftover after parsing attributes in process `syz-executor.1'. overlayfs: filesystem on './bus' not supported as upperdir overlayfs: upperdir is in-use by another mount, mount with '-o index=off' to override exclusive upperdir protection. print_req_error: I/O error, dev loop5, sector 0 Bluetooth: hci5 command 0x0405 tx timeout FAT-fs (loop4): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) FAT-fs (loop4): Directory bread(block 1986) failed FAT-fs (loop4): Directory bread(block 1987) failed FAT-fs (loop4): Directory bread(block 1988) failed FAT-fs (loop4): Directory bread(block 1989) failed FAT-fs (loop4): Directory bread(block 1990) failed FAT-fs (loop4): Directory bread(block 1991) failed FAT-fs (loop4): Directory bread(block 1992) failed FAT-fs (loop4): Directory bread(block 1993) failed FAT-fs (loop4): Directory bread(block 1994) failed FAT-fs (loop4): Directory bread(block 1995) failed (syz-executor.3,11835,0):ocfs2_parse_options:1498 ERROR: Invalid heartbeat mount options (syz-executor.3,11835,0):ocfs2_fill_super:1217 ERROR: status = -22 audit: type=1326 audit(1640527721.534:6): auid=4294967295 uid=0 gid=0 ses=4294967295 pid=11853 comm="syz-executor.0" exe="/root/syz-executor.0" sig=9 arch=c000003e syscall=231 compat=0 ip=0x7fe46c18ce99 code=0x0