INFO: task syz-executor2:8735 blocked for more than 120 seconds. Not tainted 4.18.0-rc1+ #108 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor2 D24424 8735 4564 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 invalidate_partition+0x35/0x60 block/genhd.c:1554 drop_partitions.isra.13+0xe8/0x200 block/partition-generic.c:440 rescan_partitions+0x75/0x910 block/partition-generic.c:513 __blkdev_reread_part+0x1ad/0x230 block/ioctl.c:173 blkdev_reread_part+0x26/0x40 block/ioctl.c:193 loop_reread_partitions+0x163/0x190 drivers/block/loop.c:645 loop_set_status+0xb95/0x1010 drivers/block/loop.c:1201 loop_set_status64+0xaa/0x100 drivers/block/loop.c:1319 lo_ioctl+0x8e2/0x1d10 drivers/block/loop.c:1435 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x9cd/0x2030 block/ioctl.c:601 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: 0033:0x455b29 Code: Bad RIP value. RSP: 002b:00007fca1bccbc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fca1bccc6d4 RCX: 0000000000455b29 RDX: 0000000020000380 RSI: 0000000000004c04 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004be140 R14: 00000000004cc148 R15: 0000000000000000 INFO: task blkid:8738 blocked for more than 120 seconds. Not tainted 4.18.0-rc1+ #108 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. blkid D23984 8738 22427 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 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3606 __mutex_lock_common kernel/locking/mutex.c:834 [inline] __mutex_lock+0xede/0x1820 kernel/locking/mutex.c:894 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:909 __blkdev_get+0x19b/0x13c0 fs/block_dev.c:1463 blkdev_get+0xc1/0xb50 fs/block_dev.c:1614 blkdev_open+0x1fb/0x280 fs/block_dev.c:1772 do_dentry_open+0x818/0xe40 fs/open.c:794 vfs_open+0x139/0x230 fs/open.c:908 do_last fs/namei.c:3399 [inline] path_openat+0x174a/0x4e10 fs/namei.c:3540 do_filp_open+0x255/0x380 fs/namei.c:3574 do_sys_open+0x584/0x760 fs/open.c:1101 __do_sys_open fs/open.c:1119 [inline] __se_sys_open fs/open.c:1114 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1114 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f0b61fab120 Code: Bad RIP value. RSP: 002b:00007ffde75fdbd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0b61fab120 RDX: 00007ffde75fef40 RSI: 0000000000000000 RDI: 00007ffde75fef40 RBP: 0000000000000000 R08: 0000000000000078 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000011b6030 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000005 INFO: task syz-executor4:8743 blocked for more than 120 seconds. Not tainted 4.18.0-rc1+ #108 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor4 D24488 8743 25027 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 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3606 __mutex_lock_common kernel/locking/mutex.c:834 [inline] __mutex_lock+0xede/0x1820 kernel/locking/mutex.c:894 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:909 __blkdev_get+0x19b/0x13c0 fs/block_dev.c:1463 blkdev_get+0xc1/0xb50 fs/block_dev.c:1614 blkdev_open+0x1fb/0x280 fs/block_dev.c:1772 do_dentry_open+0x818/0xe40 fs/open.c:794 vfs_open+0x139/0x230 fs/open.c:908 do_last fs/namei.c:3399 [inline] path_openat+0x174a/0x4e10 fs/namei.c:3540 do_filp_open+0x255/0x380 fs/namei.c:3574 do_sys_open+0x584/0x760 fs/open.c:1101 __do_sys_open fs/open.c:1119 [inline] __se_sys_open fs/open.c:1114 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1114 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x40fd81 Code: 48 83 c4 38 c3 0f 1f 40 00 be c8 00 00 00 bf 01 00 00 00 e8 41 b6 ff ff 48 85 c0 49 89 c5 74 47 bf d7 30 44 00 31 c0 49 83 c4 <01> e8 a9 12 01 00 48 8b 55 00 41 b9 de 2a 44 00 45 31 c0 31 c9 4c RSP: 002b:00007efecda9f7a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: cccccccccccccccd RCX: 000000000040fd81 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007efecda9f850 RBP: 000000000072bea0 R08: 000000000000000f R09: 0000000000000000 R10: 0000000020000340 R11: 0000000000000293 R12: 00000000ffffffff R13: 00000000004c220b R14: 00000000004d30a8 R15: 0000000000000000 Showing all locks held in the system: 1 lock held by khungtaskd/898: #0: 00000000c51a2787 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x428 kernel/locking/lockdep.c:4461 1 lock held by rsyslogd/4427: 2 locks held by getty/4517: #0: 000000009f54e400 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000c61e2fd8 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2131 2 locks held by getty/4518: #0: 00000000720fb2b0 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000002e7aab47 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2131 2 locks held by getty/4519: #0: 000000003492180f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 0000000000d75b04 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2131 2 locks held by getty/4520: #0: 00000000661b3b72 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000a1a941a6 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2131 2 locks held by getty/4521: #0: 0000000007a0bb6f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000002e66e6dd (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2131 2 locks held by getty/4522: #0: 000000003a5fc8ec (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000c71126fe (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2131 2 locks held by getty/4523: #0: 000000002026d9cf (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000f315cb7b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2131 1 lock held by syz-executor0/8727: 3 locks held by syz-executor2/8735: #0: 0000000056477f84 (&lo->lo_ctl_mutex/1){+.+.}, at: lo_ioctl+0x91/0x1d10 drivers/block/loop.c:1405 #1: 000000002c3a517d (&bdev->bd_mutex){+.+.}, at: blkdev_reread_part+0x1e/0x40 block/ioctl.c:192 #2: 000000002e22f345 (&type->s_umount_key#78){.+.+}, at: __get_super.part.12+0x20f/0x2e0 fs/super.c:695 1 lock held by blkid/8738: #0: 000000002c3a517d (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x19b/0x13c0 fs/block_dev.c:1463 1 lock held by syz-executor4/8743: #0: 000000002c3a517d (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x19b/0x13c0 fs/block_dev.c:1463 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 898 Comm: khungtaskd Not tainted 4.18.0-rc1+ #108 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: 8727 Comm: syz-executor0 Not tainted 4.18.0-rc1+ #108 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_acquire+0x6/0x5020 kernel/locking/lockdep.c:3294 Code: e9 c7 fd ff ff e8 7a cd 5a 00 e9 e8 fe ff ff e8 70 cd 5a 00 e9 48 ff ff ff 90 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 57 <41> 89 cf 41 56 41 55 49 89 fd 41 54 45 89 cc 53 65 4c 8b 34 25 40 RSP: 0018:ffff8801cf6feab0 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 1ffff10039edfd62 RCX: 0000000000000002 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff88f92620 RBP: ffff8801cf6feab8 R08: 0000000000000000 R09: 0000000000000000 R10: ffff8801bc778380 R11: 0000000000000000 R12: ffff8801bc778380 R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f7671e02700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000001ceff3000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1e4/0x540 kernel/locking/lockdep.c:3924 rcu_lock_acquire include/linux/rcupdate.h:245 [inline] rcu_read_lock include/linux/rcupdate.h:631 [inline] find_get_entry+0x122/0xbb0 mm/filemap.c:1428 pagecache_get_page+0x11e/0xe40 mm/filemap.c:1541 find_get_page_flags include/linux/pagemap.h:278 [inline] __find_get_block_slow fs/buffer.c:205 [inline] __find_get_block+0x5f5/0xe60 fs/buffer.c:1287 __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] hfs_mdb_get+0x523/0x22fa fs/hfs/mdb.c:87 hfs_fill_super+0x1132/0x18c0 fs/hfs/super.c:413 mount_bdev+0x30c/0x3e0 fs/super.c:1174 hfs_mount+0x34/0x40 fs/hfs/super.c:463 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: 0033:0x45855a 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:00007f7671e01a88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000002000e200 RCX: 000000000045855a RDX: 00007f7671e01ad0 RSI: 00000000200001c0 RDI: 00007f7671e01af0 RBP: 0000000000000892 R08: 00007f7671e01b30 R09: 00007f7671e01ad0 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000015 R13: 0000000000000892 R14: 00000000004d2e08 R15: 0000000000000001 INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.313 msecs