RAX: ffffffffffffffda RBX: 00007fb0ebc53c90 RCX: 0000000000457e29 RDX: 0000000020000000 RSI: 0000000024966af3 RDI: 0000000000000002 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000246 R12: 00007fb0ebc546d4 R13: 00000000004c3a0d R14: 00000000004d6968 R15: 0000000000000003 INFO: task syz-executor.2:14299 blocked for more than 140 seconds. Not tainted 5.0.0-rc8+ #1 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D29728 14299 7860 0x00000004 Call Trace: context_switch kernel/sched/core.c:2844 [inline] __schedule+0x817/0x1cc0 kernel/sched/core.c:3485 schedule+0x92/0x180 kernel/sched/core.c:3529 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:287 [inline] rwsem_down_read_failed+0x213/0x420 kernel/locking/rwsem-xadd.c:304 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+0x49/0x90 kernel/locking/rwsem.c:26 __get_super.part.0+0x203/0x2e0 fs/super.c:699 __get_super include/linux/spinlock.h:329 [inline] __get_super_thawed+0x13a/0x2d0 fs/super.c:736 get_super_thawed+0x18/0x20 fs/super.c:760 quotactl_block fs/quota/quota.c:818 [inline] kernel_quotactl+0x1e8/0x13d0 fs/quota/quota.c:872 __do_sys_quotactl fs/quota/quota.c:893 [inline] __se_sys_quotactl fs/quota/quota.c:890 [inline] __x64_sys_quotactl+0x97/0xf0 fs/quota/quota.c:890 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457e29 Code: Bad RIP value. RSP: 002b:00007f173277cc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000457e29 RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000000000000 RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f173277d6d4 R13: 00000000004c4a45 R14: 00000000004d8438 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1040: #0: 0000000010b4172b (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:4389 1 lock held by rsyslogd/7707: #0: 0000000045e27a56 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:795 2 locks held by getty/7819: #0: 0000000084b4cbdd (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000e192a715 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/7820: #0: 000000001736284f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000003d8dc583 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/7821: #0: 00000000db020e73 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000001960d8f6 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/7822: #0: 000000007fa593eb (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000e6c1195f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/7823: #0: 000000005e9fa17d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000006a52a9b6 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/7824: #0: 00000000db3733f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000007baa07b1 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/7825: #0: 00000000ff90ebb1 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000008eccc9ea (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by syz-executor.2/14271: 1 lock held by syz-executor.2/14299: #0: 00000000003121ec (&type->s_umount_key#75){.+.+}, at: __get_super.part.0+0x203/0x2e0 fs/super.c:699 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1040 Comm: khungtaskd Not tainted 5.0.0-rc8+ #1 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:203 [inline] watchdog+0x9df/0xee0 kernel/hung_task.c:287 kthread+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 14271 Comm: syz-executor.2 Not tainted 5.0.0-rc8+ #1 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:pagecache_get_page+0x49a/0x740 mm/filemap.c:1605 Code: ff 41 f7 d4 41 83 e4 01 44 89 e6 e8 e0 1f e6 ff 45 84 e4 0f 84 79 fd ff ff e8 92 1e e6 ff 41 81 cd 00 01 00 00 e9 68 fd ff ff 81 1e e6 ff 4c 89 e7 e8 79 ca 05 00 e9 01 fd ff ff e8 6f 1e e6 RSP: 0018:ffff888087987818 EFLAGS: 00000202 RAX: 0000000000000002 RBX: 0000000000000001 RCX: ffffffff8189bda5 RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000005 RBP: ffff888087987868 R08: ffff888054f0c380 R09: 0000000000000002 R10: ffffed1015d25bcf R11: ffff8880ae92de7b R12: ffffea0001e7bf00 R13: 0000000000000008 R14: 0000000000000008 R15: dffffc0000000000 FS: 00007f173279e700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 000000008715a000 CR4: 00000000001406e0 Call Trace: find_or_create_page include/linux/pagemap.h:322 [inline] grow_dev_page fs/buffer.c:948 [inline] grow_buffers fs/buffer.c:1017 [inline] __getblk_slow fs/buffer.c:1044 [inline] __getblk_gfp+0x27e/0x960 fs/buffer.c:1321 __bread_gfp+0x2f/0x300 fs/buffer.c:1355 sb_bread include/linux/buffer_head.h:307 [inline] udf_tread+0xf1/0x140 fs/udf/misc.c:44 udf_check_vsd fs/udf/super.c:686 [inline] udf_load_vrs+0x409/0xc80 fs/udf/super.c:1919 udf_fill_super+0x7d8/0x16d1 fs/udf/super.c:2132 mount_bdev+0x307/0x3c0 fs/super.c:1159 udf_mount+0x35/0x40 fs/udf/super.c:131 mount_fs+0x106/0x3ff fs/super.c:1258 vfs_kern_mount.part.0+0x6f/0x410 fs/namespace.c:959 vfs_kern_mount fs/namespace.c:949 [inline] do_new_mount fs/namespace.c:2513 [inline] do_mount+0x581/0x2d30 fs/namespace.c:2845 ksys_mount+0xdb/0x150 fs/namespace.c:3061 __do_sys_mount fs/namespace.c:3075 [inline] __se_sys_mount fs/namespace.c:3072 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3072 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457e29 Code: ad b8 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 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f173279dc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000457e29 RDX: 0000000020000100 RSI: 0000000020000080 RDI: 00000000200002c0 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f173279e6d4 R13: 00000000004c3bf7 R14: 00000000004d6e00 R15: 00000000ffffffff