device ifb0 entered promiscuous mode INFO: task syz-executor7:373 blocked for more than 120 seconds. Not tainted 4.17.0-rc7+ #72 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor7 D20152 373 4574 0x00000004 Call Trace: context_switch kernel/sched/core.c:2859 [inline] __schedule+0x801/0x1e30 kernel/sched/core.c:3501 schedule+0xef/0x430 kernel/sched/core.c:3545 io_schedule+0x1c/0x70 kernel/sched/core.c:5165 __blkdev_direct_IO_simple+0x7fc/0xfb0 fs/block_dev.c:241 blkdev_direct_IO+0xb5f/0x1100 fs/block_dev.c:428 generic_file_read_iter+0x510/0x2f00 mm/filemap.c:2341 blkdev_read_iter+0x120/0x190 fs/block_dev.c:1930 call_read_iter include/linux/fs.h:1778 [inline] generic_file_splice_read+0x552/0x910 fs/splice.c:307 do_splice_to+0x12e/0x190 fs/splice.c:880 splice_direct_to_actor+0x268/0x8d0 fs/splice.c:952 do_splice_direct+0x2cc/0x400 fs/splice.c:1061 do_sendfile+0x60f/0xe00 fs/read_write.c:1440 __do_sys_sendfile64 fs/read_write.c:1495 [inline] __se_sys_sendfile64 fs/read_write.c:1487 [inline] __x64_sys_sendfile64+0x155/0x240 fs/read_write.c:1487 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455a09 RSP: 002b:00007f2e34d0cc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f2e34d0d6d4 RCX: 0000000000455a09 RDX: 0000000020000040 RSI: 0000000000000013 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 000000001b7889b2 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000579 R14: 00000000006fc3f8 R15: 0000000000000000 Showing all locks held in the system: 2 locks held by khungtaskd/892: #0: 0000000087569446 (rcu_read_lock){....}, at: check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] #0: 0000000087569446 (rcu_read_lock){....}, at: watchdog+0x1ff/0xf60 kernel/hung_task.c:249 #1: 0000000050630caf (tasklist_lock){.+.+}, at: debug_show_all_locks+0xde/0x34a kernel/locking/lockdep.c:4470 2 locks held by getty/4492: #0: 00000000be14cc92 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000b32c4a5b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4493: #0: 0000000011fd9a43 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000005c485307 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4494: #0: 00000000ed9f0a9f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000ec7e28dd (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4495: #0: 00000000034e4915 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000813121e2 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4496: #0: 0000000002fb493d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000a33887f4 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4497: #0: 00000000e0b66996 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000003df8fcb6 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4498: #0: 00000000870dadb4 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000003aa984f8 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 892 Comm: khungtaskd Not tainted 4.17.0-rc7+ #72 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+0x1b9/0x294 lib/dump_stack.c:113 nmi_cpu_backtrace.cold.4+0x19/0xce lib/nmi_backtrace.c:103 nmi_trigger_cpumask_backtrace+0x151/0x192 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline] check_hung_task kernel/hung_task.c:132 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline] watchdog+0xc10/0xf60 kernel/hung_task.c:249 kthread+0x345/0x410 kernel/kthread.c:240 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 2388 Comm: udevd Not tainted 4.17.0-rc7+ #72 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_acquire+0xa78/0x5140 kernel/locking/lockdep.c:3434 RSP: 0018:ffff8801caf4f3c0 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: ffffffff89be0868 RCX: 0000000000000001 RDX: 1ffff100395e8915 RSI: ffff8801caf448b8 RDI: ffffffff89be0878 RBP: ffff8801caf4f750 R08: 0000000000001e68 R09: 0000000000000000 R10: ffff8801caf448b8 R11: ffff8801caf44080 R12: 1ffff100395e9ea0 R13: 0000000000000000 R14: 05bc14afc5dd28c2 R15: 0000000000000001 FS: 00007f5077a637a0(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000001cadae000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1dc/0x520 kernel/locking/lockdep.c:3920 seqcount_lockdep_reader_access include/linux/seqlock.h:81 [inline] read_seqcount_begin include/linux/seqlock.h:164 [inline] ktime_get_ts64+0x147/0x510 kernel/time/timekeeping.c:876 ep_set_mstimeout fs/eventpoll.c:1718 [inline] ep_poll+0x4ff/0x11d0 fs/eventpoll.c:1749 do_epoll_wait+0x1b0/0x200 fs/eventpoll.c:2191 __do_sys_epoll_wait fs/eventpoll.c:2201 [inline] __se_sys_epoll_wait fs/eventpoll.c:2198 [inline] __x64_sys_epoll_wait+0x97/0xf0 fs/eventpoll.c:2198 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f5077177943 RSP: 002b:00007ffd4d5af468 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8 RAX: ffffffffffffffda RBX: 0000000000000bb8 RCX: 00007f5077177943 RDX: 0000000000000008 RSI: 00007ffd4d5af560 RDI: 000000000000000a RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000bb8 R11: 0000000000000246 R12: 0000000000000003 R13: 0000000000000000 R14: 00000000026195a0 R15: 0000000002615250 Code: 0f 85 ba 31 00 00 8b 0d d7 19 ad 07 85 c9 0f 84 62 f7 ff ff 48 b8 00 00 00 00 00 fc ff df 48 8b 54 24 78 48 c1 ea 03 80 3c 02 00 <0f> 85 fd 32 00 00 48 8b 94 24 88 00 00 00 4d 89 b3 28 08 00 00