input: syz1 as /devices/virtual/input/input8488 BUG: sleeping function called from invalid context at mm/slab.h:422 in_atomic(): 1, irqs_disabled(): 1, pid: 3973, name: syz-executor.4 3 locks held by syz-executor.4/3973: #0: 00000000b36bf3b3 (&ep->mtx){+.+.}, at: __do_sys_epoll_ctl fs/eventpoll.c:2075 [inline] #0: 00000000b36bf3b3 (&ep->mtx){+.+.}, at: __se_sys_epoll_ctl+0x5d2/0x2b90 fs/eventpoll.c:1997 #1: 000000001afb759c (&dev->dev_mutex){+.+.}, at: v4l2_m2m_fop_poll+0x91/0x110 drivers/media/v4l2-core/v4l2-mem2mem.c:1056 #2: 000000008f83b0ee (&(&q->done_lock)->rlock){....}, at: v4l2_m2m_poll+0x140/0x720 drivers/media/v4l2-core/v4l2-mem2mem.c:623 irq event stamp: 390 hardirqs last enabled at (389): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (389): [] _raw_spin_unlock_irqrestore+0x79/0xe0 kernel/locking/spinlock.c:184 hardirqs last disabled at (390): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (390): [] _raw_spin_lock_irqsave+0x66/0xc0 kernel/locking/spinlock.c:152 softirqs last enabled at (132): [] __do_softirq+0x678/0x980 kernel/softirq.c:318 softirqs last disabled at (41): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (41): [] irq_exit+0x215/0x260 kernel/softirq.c:412 Preemption disabled at: [<0000000000000000>] (null) CPU: 0 PID: 3973 Comm: syz-executor.4 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: 0033:0x7fb9741a9e99 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:00007fb972b1f168 EFLAGS: 00000246 ORIG_RAX: 00000000000000e9 RAX: ffffffffffffffda RBX: 00007fb9742bcf60 RCX: 00007fb9741a9e99 RDX: 0000000000000003 RSI: 0000000000000001 RDI: 0000000000000006 RBP: 00007fb974203ff1 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000200000c0 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd269551af R14: 00007fb972b1f300 R15: 0000000000022000 input: syz1 as /devices/virtual/input/input8489 input: syz1 as /devices/virtual/input/input8491 input: syz1 as /devices/virtual/input/input8492 input: syz1 as /devices/virtual/input/input8493 EXT4-fs: failed to create workqueue EXT4-fs (loop1): mount failed input: syz1 as /devices/virtual/input/input8495 input: syz1 as /devices/virtual/input/input8496 input: syz1 as /devices/virtual/input/input8498 input: syz1 as /devices/virtual/input/input8499 input: syz1 as /devices/virtual/input/input8500 input: syz1 as /devices/virtual/input/input8502 input: syz1 as /devices/virtual/input/input8503 input: syz1 as /devices/virtual/input/input8505 vhci_hcd vhci_hcd.0: pdev(5) rhport(0) sockfd(4) vhci_hcd vhci_hcd.0: devid(0) speed(1) speed_str(low-speed) input: syz1 as /devices/virtual/input/input8506 input: syz1 as /devices/virtual/input/input8507 vhci_hcd vhci_hcd.0: Device attached vhci_hcd: connection closed vhci_hcd: stop threads vhci_hcd: release socket vhci_hcd: disconnect device input: syz1 as /devices/virtual/input/input8509 input: syz1 as /devices/virtual/input/input8510 input: syz1 as /devices/virtual/input/input8512 input: syz1 as /devices/virtual/input/input8513 input: syz1 as /devices/virtual/input/input8514 vhci_hcd vhci_hcd.0: pdev(5) rhport(0) sockfd(4) vhci_hcd vhci_hcd.0: devid(0) speed(1) speed_str(low-speed) input: syz1 as /devices/virtual/input/input8516 input: syz1 as /devices/virtual/input/input8515 vhci_hcd vhci_hcd.0: Device attached vhci_hcd: connection closed vhci_hcd: stop threads vhci_hcd: release socket input: syz1 as /devices/virtual/input/input8518 vhci_hcd: disconnect device usb 19-1: new low-speed USB device number 2 using vhci_hcd usb 19-1: enqueue for inactive port 0 usb 19-1: enqueue for inactive port 0 usb 19-1: enqueue for inactive port 0 vhci_hcd vhci_hcd.0: pdev(5) rhport(0) sockfd(4) vhci_hcd vhci_hcd.0: devid(0) speed(1) speed_str(low-speed) input: syz1 as /devices/virtual/input/input8521 input: syz1 as /devices/virtual/input/input8519 vhci_hcd vhci_hcd.0: Device attached vhci_hcd: connection closed vhci_hcd: stop threads vhci_hcd: release socket vhci_hcd: disconnect device input: syz1 as /devices/virtual/input/input8522 vhci_hcd: vhci_device speed not set input: syz1 as /devices/virtual/input/input8524 input: syz1 as /devices/virtual/input/input8523 input: syz1 as /devices/virtual/input/input8527 IPVS: ftp: loaded support on port[0] = 21 input: syz1 as /devices/virtual/input/input8528 input: syz1 as /devices/virtual/input/input8529 syz-executor.4 (4602) used greatest stack depth: 22880 bytes left input: syz1 as /devices/virtual/input/input8530 input: syz1 as /devices/virtual/input/input8532 input: syz1 as /devices/virtual/input/input8531 IPVS: ftp: loaded support on port[0] = 21 input: syz1 as /devices/virtual/input/input8534 IPVS: ftp: loaded support on port[0] = 21 input: syz1 as /devices/virtual/input/input8536 input: syz1 as /devices/virtual/input/input8535 syz-executor.1 (4757) used greatest stack depth: 22560 bytes left input: syz1 as /devices/virtual/input/input8538 overlayfs: unrecognized mount option "fowner=00000000000000000000" or missing value