R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000015 R13: 00000000004bbc77 R14: 00000000004c8e50 R15: 0000000000000001 INFO: task syz-executor1:10192 blocked for more than 120 seconds. Not tainted 4.18.0-rc2+ #117 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor1 D24672 10192 4542 0x00000004 Call Trace: context_switch kernel/sched/core.c:2862 [inline] __schedule+0x87c/0x1ed0 kernel/sched/core.c:3504 schedule+0xfb/0x450 kernel/sched/core.c:3548 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline] rwsem_down_read_failed+0x362/0x600 kernel/locking/rwsem-xadd.c:286 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0xc3/0x1d0 kernel/locking/rwsem.c:26 __get_super.part.12+0x20f/0x2e0 fs/super.c:695 __get_super include/linux/spinlock.h:310 [inline] get_super+0x2d/0x50 fs/super.c:724 fsync_bdev+0x17/0xc0 fs/block_dev.c:468 blkdev_flushbuf block/ioctl.c:436 [inline] blkdev_ioctl+0x10dc/0x2030 block/ioctl.c:521 block_ioctl+0xee/0x130 fs/block_dev.c:1880 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:684 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701 __do_sys_ioctl fs/ioctl.c:708 [inline] __se_sys_ioctl fs/ioctl.c:706 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:706 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455a99 Code: Bad RIP value. RSP: 002b:00007f6b7101ac68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f6b7101b6d4 RCX: 0000000000455a99 RDX: 0000000000000014 RSI: 0000000000001261 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004bdf9b R14: 00000000004cc3a8 R15: 0000000000000000 Showing all locks held in the system: 1 lock held by khungtaskd/899: #0: 000000005b1dc901 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x428 kernel/locking/lockdep.c:4461 1 lock held by rsyslogd/4401: #0: 00000000008267ab (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766 2 locks held by getty/4491: #0: 000000001107380d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 0000000092b3ab35 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2131 2 locks held by getty/4492: #0: 0000000001b54925 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000e6129aef (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2131 2 locks held by getty/4493: #0: 000000007cd2b030 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000e13a6004 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2131 2 locks held by getty/4494: #0: 000000003582daff (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000a33727ad (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2131 2 locks held by getty/4495: #0: 0000000057dc3893 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 0000000020a47256 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2131 2 locks held by getty/4496: #0: 00000000a9172427 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 0000000015fcd96c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2131 2 locks held by getty/4497: #0: 00000000a266f73a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000fb290b3b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2131 1 lock held by syz-executor0/10161: 1 lock held by syz-executor1/10192: #0: 000000003de53325 (&type->s_umount_key#71){.+.+}, at: __get_super.part.12+0x20f/0x2e0 fs/super.c:695 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 899 Comm: khungtaskd Not tainted 4.18.0-rc2+ #117 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+0x1c9/0x2b4 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_uninterruptible_tasks kernel/hung_task.c:196 [inline] watchdog+0x9c4/0xf80 kernel/hung_task.c:252 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: 10161 Comm: syz-executor0 Not tainted 4.18.0-rc2+ #117 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:match_held_lock+0x2e8/0x8d0 kernel/locking/lockdep.c:3495 Code: fc 48 b9 00 00 00 00 00 fc ff df c6 04 08 f8 4d 85 ff 75 4a 31 c0 48 ba 00 00 00 00 00 fc ff df 48 01 d3 48 c7 03 00 00 00 00 <48> c7 43 08 00 00 00 00 48 8b 75 d0 65 48 33 34 25 28 00 00 00 0f RSP: 0018:ffff880166eff068 EFLAGS: 00000086 RAX: 0000000000000000 RBX: ffffed002cddfe12 RCX: ffffc90001e1c000 RDX: dffffc0000000000 RSI: ffffffff88f92660 RDI: ffff8801aa040c1a RBP: ffff880166eff158 R08: ffff8801aa0403c0 R09: ffffed003b5e46d6 R10: 0000000000000003 R11: 0000000000000001 R12: ffff8801aa0403c0 R13: ffff8801aa040bf8 R14: ffff880166eff130 R15: 0000000000000000 FS: 00007fbf61016700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000263b000 CR3: 00000001c3f11000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __lock_is_held+0xb5/0x140 kernel/locking/lockdep.c:3744 lock_is_held_type+0x121/0x210 kernel/locking/lockdep.c:3962 lock_is_held include/linux/lockdep.h:344 [inline] ___might_sleep+0x2d2/0x330 kernel/sched/core.c:6155 __might_sleep+0x95/0x190 kernel/sched/core.c:6143 lock_page include/linux/pagemap.h:481 [inline] pagecache_get_page+0x787/0xe40 mm/filemap.c:1554 find_or_create_page include/linux/pagemap.h:322 [inline] grow_dev_page fs/buffer.c:940 [inline] grow_buffers fs/buffer.c:1009 [inline] __getblk_slow fs/buffer.c:1036 [inline] __getblk_gfp+0x3bb/0xb10 fs/buffer.c:1313 __bread_gfp+0x2d/0x310 fs/buffer.c:1347 sb_bread include/linux/buffer_head.h:307 [inline] isofs_fill_super+0x8bf/0x3720 fs/isofs/inode.c:671 mount_bdev+0x30c/0x3e0 fs/super.c:1174 isofs_mount+0x34/0x40 fs/isofs/inode.c:1563 mount_fs+0xae/0x328 fs/super.c:1277 vfs_kern_mount.part.34+0xdc/0x4e0 fs/namespace.c:1037 vfs_kern_mount fs/namespace.c:1027 [inline] do_new_mount fs/namespace.c:2518 [inline] do_mount+0x581/0x30e0 fs/namespace.c:2848 ksys_mount+0x12d/0x140 fs/namespace.c:3064 __do_sys_mount fs/namespace.c:3078 [inline] __se_sys_mount fs/namespace.c:3075 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3075 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4584ca Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 dd 8f fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 ba 8f fb ff c3 66 0f 1f 84 00 00 00 00 00 RSP: 002b:00007fbf61015a88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fbf61015b30 RCX: 00000000004584ca RDX: 00007fbf61015ad0 RSI: 0000000020000040 RDI: 00007fbf61015af0 RBP: 0000000020000040 R08: 00007fbf61015b30 R09: 00007fbf61015ad0 R10: 0000000000000041 R11: 0000000000000206 R12: 0000000000000015 R13: 0000000000000041 R14: 00000000004d32d8 R15: 0000000000000000 INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.015 msecs