INFO: task syz-executor1:15042 blocked for more than 120 seconds. Not tainted 4.18.0-rc2+ #116 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor1 D25336 15042 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: 35 48 00 48 89 04 24 48 c7 44 24 08 1d 00 00 00 e8 8c 71 fd ff e8 37 6a fd ff 0f b6 44 24 2f 83 e0 1f 48 89 04 24 e8 b6 6f fd e8 81 6a fd ff e8 5c 68 fd ff 48 8d 05 0c 35 48 00 48 89 04 24 RSP: 002b:00007fe89974ec68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fe89974f6d4 RCX: 0000000000455a99 RDX: 0000000020000380 RSI: 0000000000001261 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004be0a4 R14: 00000000004cc4c8 R15: 0000000000000000 INFO: task syz-executor1:15060 blocked for more than 120 seconds. Not tainted 4.18.0-rc2+ #116 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor1 D25784 15060 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: 35 48 00 48 89 04 24 48 c7 44 24 08 1d 00 00 00 e8 8c 71 fd ff e8 37 6a fd ff 0f b6 44 24 2f 83 e0 1f 48 89 04 24 e8 b6 6f fd e8 81 6a fd ff e8 5c 68 fd ff 48 8d 05 0c 35 48 00 48 89 04 24 RSP: 002b:00007fe89970cc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fe89970d6d4 RCX: 0000000000455a99 RDX: 0000000020000380 RSI: 0000000000001261 RDI: 0000000000000014 RBP: 000000000072bff0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004be0a4 R14: 00000000004cc4c8 R15: 0000000000000002 Showing all locks held in the system: 1 lock held by khungtaskd/899: #0: 00000000f71ac8c7 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x428 kernel/locking/lockdep.c:4461 1 lock held by rsyslogd/4399: 2 locks held by getty/4489: #0: 00000000e589a078 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000ea14f1cf (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2131 2 locks held by getty/4490: #0: 000000000c88a29b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000002f85689f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2131 2 locks held by getty/4491: #0: 000000006a098222 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000ac59b1cf (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2131 2 locks held by getty/4492: #0: 000000008342b9a0 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000984c8a21 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2131 2 locks held by getty/4493: #0: 00000000d9e226f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000c7224b43 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2131 2 locks held by getty/4494: #0: 000000006225d913 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000004c152015 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2131 2 locks held by getty/4495: #0: 000000006ac359ce (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 0000000089894575 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2131 1 lock held by syz-executor4/14946: 1 lock held by syz-executor1/15042: #0: 000000003794eaac (&type->s_umount_key#44){++++}, at: __get_super.part.12+0x20f/0x2e0 fs/super.c:695 1 lock held by syz-executor1/15060: #0: 000000003794eaac (&type->s_umount_key#44){++++}, at: __get_super.part.12+0x20f/0x2e0 fs/super.c:695 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 899 Comm: khungtaskd Not tainted 4.18.0-rc2+ #116 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 14946 Comm: syz-executor4 Not tainted 4.18.0-rc2+ #116 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:trace_hardirqs_on_caller+0x2f0/0x5c0 kernel/locking/lockdep.c:2870 Code: df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 b8 02 00 00 48 83 3d b0 0a 93 07 00 0f 84 94 02 00 00 9c 58 0f 1f 44 00 00 f6 c4 02 <0f> 85 38 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 da 83 e3 07 RSP: 0018:ffff8801c98ef0b8 EFLAGS: 00000046 RAX: 0000000000000082 RBX: ffffffff8aa4ab60 RCX: ffffc9000541f000 RDX: 1ffffffff11e3614 RSI: ffffffff81d4aa2b RDI: ffffffff88f1b0a0 RBP: ffff8801c98ef0c8 R08: ffff8801b597e4c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff81d4aa30 R13: dffffc0000000000 R14: 000000000000000f R15: 0000000000000000 FS: 00007f2585774700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000bef000 CR3: 00000001b8e18000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: trace_hardirqs_on+0xd/0x10 kernel/locking/lockdep.c:2894 lookup_bh_lru fs/buffer.c:1271 [inline] __find_get_block+0x2c0/0xe60 fs/buffer.c:1283 __getblk_slow fs/buffer.c:1032 [inline] __getblk_gfp+0x2be/0xb10 fs/buffer.c:1313 __bread_gfp+0x2d/0x310 fs/buffer.c:1347 sb_bread include/linux/buffer_head.h:307 [inline] fat__get_entry+0x59c/0xa30 fs/fat/dir.c:101 fat_get_entry fs/fat/dir.c:129 [inline] fat_get_short_entry+0x13c/0x2c0 fs/fat/dir.c:876 fat_subdirs+0x13c/0x290 fs/fat/dir.c:942 fat_read_root fs/fat/inode.c:1417 [inline] fat_fill_super+0x29d0/0x4400 fs/fat/inode.c:1847 vfat_fill_super+0x31/0x40 fs/fat/namei_vfat.c:1054 mount_bdev+0x30c/0x3e0 fs/super.c:1174 vfat_mount+0x34/0x40 fs/fat/namei_vfat.c:1061 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:00007f2585773a88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f2585773b30 RCX: 00000000004584ca RDX: 00007f2585773ad0 RSI: 0000000020000100 RDI: 00007f2585773af0 RBP: 0000000020000100 R08: 00007f2585773b30 R09: 00007f2585773ad0 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000013 R13: 0000000000000000 R14: 00000000004d33b0 R15: 0000000000000000