INFO: task syz-executor.5:24497 blocked for more than 143 seconds. Not tainted 5.2.0-rc5+ #31 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28112 24497 25419 0x00004004 Call Trace: context_switch kernel/sched/core.c:2818 [inline] __schedule+0x7cb/0x1560 kernel/sched/core.c:3445 schedule+0xa8/0x260 kernel/sched/core.c:3509 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:495 [inline] rwsem_down_read_failed+0x213/0x460 kernel/locking/rwsem-xadd.c:515 __down_read kernel/locking/rwsem.h:178 [inline] down_read+0xa5/0x1e0 kernel/locking/rwsem.c:26 __get_super.part.0+0x203/0x2e0 fs/super.c:788 __get_super include/linux/spinlock.h:338 [inline] get_super+0x2e/0x50 fs/super.c:817 fsync_bdev+0x19/0xd0 fs/block_dev.c:523 invalidate_partition+0x36/0x60 block/genhd.c:1601 drop_partitions block/partition-generic.c:450 [inline] rescan_partitions+0xef/0xa20 block/partition-generic.c:523 __blkdev_get+0x1213/0x1660 fs/block_dev.c:1594 blkdev_get+0xc4/0x990 fs/block_dev.c:1664 blkdev_open+0x205/0x290 fs/block_dev.c:1822 do_dentry_open+0x4df/0x1250 fs/open.c:778 vfs_open+0xa0/0xd0 fs/open.c:887 do_last fs/namei.c:3416 [inline] path_openat+0x10e9/0x46d0 fs/namei.c:3533 do_filp_open+0x1a1/0x280 fs/namei.c:3563 do_sys_open+0x3fe/0x5d0 fs/open.c:1070 __do_sys_open fs/open.c:1088 [inline] __se_sys_open fs/open.c:1083 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1083 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4131b1 Code: 44 00 48 89 ee 48 89 df 48 85 c0 4c 0f 45 c8 45 31 c0 31 c9 e8 30 59 00 00 85 c0 41 89 c7 75 a5 48 89 ef e8 71 81 ff ff 49 8b <3c> 24 31 c9 48 89 c2 be 01 00 00 00 e8 9e be 00 00 85 c0 41 89 c7 RSP: 002b:00007fe7a67a47a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 00000000004131b1 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007fe7a67a4850 RBP: 000000000075bf20 R08: 000000000000000f R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007fe7a67a56d4 R13: 00000000004c852c R14: 00000000004dedf8 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1043: #0: 000000000b18b7ee (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5149 1 lock held by rsyslogd/9584: 2 locks held by getty/9706: #0: 0000000047f99849 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000dcbf37ab (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/9707: #0: 00000000051732a8 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000008b3d6915 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/9708: #0: 0000000040435afc (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000fabc0e92 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/9709: #0: 000000009b35fb7f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000008d4d61bd (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/9710: #0: 000000005b6f555b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000091bcb757 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/9711: #0: 00000000369e0526 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000efde6606 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/9712: #0: 00000000fdcbe5f1 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000028518678 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.0/24488: 2 locks held by syz-executor.5/24497: #0: 00000000fe8331ec (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x19b/0x1660 fs/block_dev.c:1510 #1: 0000000062031bd5 (&type->s_umount_key#78){.+.+}, at: __get_super.part.0+0x203/0x2e0 fs/super.c:788 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1043 Comm: khungtaskd Not tainted 5.2.0-rc5+ #31 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+0x172/0x1f0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1be/0x236 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:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0x9b7/0xec0 kernel/hung_task.c:289 kthread+0x354/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 24488 Comm: syz-executor.0 Not tainted 5.2.0-rc5+ #31 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__sanitizer_cov_trace_pc+0x3b/0x50 kernel/kcov.c:107 Code: 65 8b 15 40 3c 91 7e 81 e2 00 01 1f 00 75 2b 8b 90 e0 12 00 00 83 fa 02 75 20 48 8b 88 e8 12 00 00 8b 80 e4 12 00 00 48 8b 11 <48> 83 c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 5d c3 0f 1f 00 65 RSP: 0018:ffff8880561df5e0 EFLAGS: 00000246 RAX: 0000000000040000 RBX: ffff8880561df6c8 RCX: ffffc9001187e000 RDX: 000000000003ffff RSI: ffffffff8719f08c RDI: 0000000000000005 RBP: ffff8880561df5e0 R08: ffff888087940340 R09: ffffed1015d26c70 R10: ffffed1015d26c6f R11: ffff8880ae93637b R12: ffff88808f7f6002 R13: ffff8880561df6e0 R14: 0000000000000001 R15: ffff88808f7f6002 FS: 00007f2325d78700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 0000000063e3a000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: xa_is_internal include/linux/xarray.h:169 [inline] xa_is_node include/linux/xarray.h:1188 [inline] xas_start+0xdc/0x560 lib/xarray.c:188 xas_load+0x21/0x150 lib/xarray.c:232 find_get_entry+0x144/0x770 mm/filemap.c:1506 pagecache_get_page+0x4c/0x850 mm/filemap.c:1608 find_get_page_flags include/linux/pagemap.h:266 [inline] __find_get_block_slow fs/buffer.c:207 [inline] __find_get_block fs/buffer.c:1296 [inline] __find_get_block+0x4ff/0xcf0 fs/buffer.c:1290 __getblk_slow fs/buffer.c:1041 [inline] __getblk_gfp+0x1b1/0x970 fs/buffer.c:1322 __bread_gfp+0x2f/0x300 fs/buffer.c:1356 sb_bread include/linux/buffer_head.h:307 [inline] read_raw_super_block+0x1b5/0x1a10 fs/f2fs/super.c:2889 f2fs_fill_super+0x1fe/0x5ac0 fs/f2fs/super.c:3118 mount_bdev+0x304/0x3c0 fs/super.c:1346 f2fs_mount+0x35/0x40 fs/f2fs/super.c:3539 legacy_get_tree+0x108/0x220 fs/fs_context.c:661 vfs_get_tree+0x8e/0x390 fs/super.c:1476 do_new_mount fs/namespace.c:2791 [inline] do_mount+0x138c/0x1c00 fs/namespace.c:3111 ksys_mount+0xdb/0x150 fs/namespace.c:3320 __do_sys_mount fs/namespace.c:3334 [inline] __se_sys_mount fs/namespace.c:3331 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3331 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4592c9 Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f2325d77c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00000000004592c9 RDX: 00000000200000c0 RSI: 0000000020000040 RDI: 0000000020000000 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2325d786d4 R13: 00000000004c570b R14: 00000000004d9aa0 R15: 00000000ffffffff