INFO: task syz-executor434:19580 blocked for more than 140 seconds. Not tainted 4.19.80 #0 kobject: 'loop0' (000000007e212fbb): kobject_uevent_env kobject: 'loop0' (000000007e212fbb): fill_kobj_path: path = '/devices/virtual/block/loop0' "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor434 D28840 19580 7903 0x00000004 kobject: 'loop0' (000000007e212fbb): kobject_uevent_env kobject: 'loop0' (000000007e212fbb): fill_kobj_path: path = '/devices/virtual/block/loop0' Call Trace: UDF-fs: warning (device loop0): udf_load_vrs: No VRS found UDF-fs: Scanning with blocksize 512 failed context_switch kernel/sched/core.c:2826 [inline] __schedule+0x866/0x1dc0 kernel/sched/core.c:3515 UDF-fs: warning (device loop0): udf_load_vrs: No VRS found UDF-fs: Scanning with blocksize 1024 failed UDF-fs: warning (device loop0): udf_load_vrs: No VRS found UDF-fs: Scanning with blocksize 2048 failed schedule+0x92/0x1c0 kernel/sched/core.c:3559 UDF-fs: warning (device loop0): udf_load_vrs: No VRS found __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:589 [inline] rwsem_down_write_failed+0x774/0xc30 kernel/locking/rwsem-xadd.c:618 UDF-fs: Scanning with blocksize 4096 failed call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 kobject: 'loop0' (000000007e212fbb): kobject_uevent_env kobject: 'loop0' (000000007e212fbb): fill_kobj_path: path = '/devices/virtual/block/loop0' __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0x53/0x90 kernel/locking/rwsem.c:72 grab_super+0xaf/0x2c0 fs/super.c:383 kobject: 'loop0' (000000007e212fbb): kobject_uevent_env kobject: 'loop0' (000000007e212fbb): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (000000007e212fbb): kobject_uevent_env kobject: 'loop0' (000000007e212fbb): fill_kobj_path: path = '/devices/virtual/block/loop0' UDF-fs: warning (device loop0): udf_load_vrs: No VRS found UDF-fs: Scanning with blocksize 512 failed UDF-fs: warning (device loop0): udf_load_vrs: No VRS found sget_userns+0x357/0xd30 fs/super.c:511 UDF-fs: Scanning with blocksize 1024 failed UDF-fs: warning (device loop0): udf_load_vrs: No VRS found sget+0x10c/0x150 fs/super.c:570 UDF-fs: Scanning with blocksize 2048 failed mount_bdev+0xff/0x3c0 fs/super.c:1131 UDF-fs: warning (device loop0): udf_load_vrs: No VRS found udf_mount+0x35/0x40 fs/udf/super.c:131 UDF-fs: Scanning with blocksize 4096 failed mount_fs+0xa8/0x31f fs/super.c:1261 vfs_kern_mount.part.0+0x6f/0x410 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2469 [inline] do_mount+0x53e/0x2bc0 fs/namespace.c:2799 kobject: 'loop0' (000000007e212fbb): kobject_uevent_env kobject: 'loop0' (000000007e212fbb): fill_kobj_path: path = '/devices/virtual/block/loop0' ksys_mount+0xdb/0x150 fs/namespace.c:3015 kobject: 'loop0' (000000007e212fbb): kobject_uevent_env kobject: 'loop0' (000000007e212fbb): fill_kobj_path: path = '/devices/virtual/block/loop0' __do_sys_mount fs/namespace.c:3029 [inline] __se_sys_mount fs/namespace.c:3026 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3026 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 UDF-fs: warning (device loop0): udf_load_vrs: No VRS found entry_SYSCALL_64_after_hwframe+0x49/0xbe UDF-fs: Scanning with blocksize 512 failed RIP: 0033:0x44a789 UDF-fs: warning (device loop0): udf_load_vrs: No VRS found Code: 4d cb 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 1b cb fb ff c3 66 2e 0f 1f 84 00 00 00 00 UDF-fs: Scanning with blocksize 1024 failed UDF-fs: warning (device loop0): udf_load_vrs: No VRS found UDF-fs: Scanning with blocksize 2048 failed RSP: 002b:00007f7c5a06cdb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 UDF-fs: warning (device loop0): udf_load_vrs: No VRS found RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 000000000044a789 UDF-fs: Scanning with blocksize 4096 failed RDX: 00000000200001c0 RSI: 0000000020000180 RDI: 0000000020000140 kobject: 'loop0' (000000007e212fbb): kobject_uevent_env RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000 kobject: 'loop0' (000000007e212fbb): fill_kobj_path: path = '/devices/virtual/block/loop0' R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc2c R13: 00007ffeb715481f R14: 00007f7c5a06d9c0 R15: 0000000000000000 kobject: 'loop0' (000000007e212fbb): kobject_uevent_env kobject: 'loop0' (000000007e212fbb): fill_kobj_path: path = '/devices/virtual/block/loop0' Showing all locks held in the system: 1 lock held by khungtaskd/1037: #0: 00000000d26a7517 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:4438 1 lock held by rsyslogd/7413: kobject: 'loop0' (000000007e212fbb): kobject_uevent_env #0: 00000000cf31d5ee (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:767 kobject: 'loop0' (000000007e212fbb): fill_kobj_path: path = '/devices/virtual/block/loop0' 2 locks held by getty/7535: #0: 00000000321286fa (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 UDF-fs: warning (device loop0): udf_load_vrs: No VRS found UDF-fs: Scanning with blocksize 512 failed #1: 00000000d5738cfa (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7536: UDF-fs: warning (device loop0): udf_load_vrs: No VRS found UDF-fs: Scanning with blocksize 1024 failed #0: 000000002d863058 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000ea62a411 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 UDF-fs: warning (device loop0): udf_load_vrs: No VRS found UDF-fs: Scanning with blocksize 2048 failed 2 locks held by getty/7537: #0: 000000004c822780 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000403b5f66 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 UDF-fs: warning (device loop0): udf_load_vrs: No VRS found 2 locks held by getty/7538: UDF-fs: Scanning with blocksize 4096 failed #0: 0000000046cb779f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000c146ba5c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7539: #0: 00000000dad79ec9 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 kobject: 'loop0' (000000007e212fbb): kobject_uevent_env kobject: 'loop0' (000000007e212fbb): fill_kobj_path: path = '/devices/virtual/block/loop0' #1: 000000008388e628 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7540: kobject: 'loop0' (000000007e212fbb): kobject_uevent_env kobject: 'loop0' (000000007e212fbb): fill_kobj_path: path = '/devices/virtual/block/loop0' #0: 000000005e212118 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 UDF-fs: warning (device loop0): udf_load_vrs: No VRS found #1: 000000009cf083bc (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 UDF-fs: Scanning with blocksize 512 failed UDF-fs: warning (device loop0): udf_load_vrs: No VRS found 2 locks held by getty/7541: #0: 000000001c56b467 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 UDF-fs: Scanning with blocksize 1024 failed UDF-fs: warning (device loop0): udf_load_vrs: No VRS found UDF-fs: Scanning with blocksize 2048 failed #1: 0000000054296831 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 1 lock held by syz-executor434/9276: UDF-fs: warning (device loop0): udf_load_vrs: No VRS found 1 lock held by syz-executor434/11889: UDF-fs: Scanning with blocksize 4096 failed 1 lock held by syz-executor434/12563: 1 lock held by syz-executor434/16164: 2 locks held by syz-executor434/19580: #0: 000000004f32b2ca (&bdev->bd_fsfreeze_mutex){+.+.}, at: mount_bdev+0x93/0x3c0 fs/super.c:1125 #1: 0000000052d90c5b (&type->s_umount_key#52){+.+.}, at: grab_super+0xaf/0x2c0 fs/super.c:383 kobject: 'loop0' (000000007e212fbb): kobject_uevent_env kobject: 'loop0' (000000007e212fbb): fill_kobj_path: path = '/devices/virtual/block/loop0' 1 lock held by syz-executor434/19582: 2 locks held by blkid/25784: #0: 000000000c924958 (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x19b/0x1660 fs/block_dev.c:1471 #1: 00000000d26a7517 (rcu_read_lock){....}, at: trace_sched_stat_runtime include/trace/events/sched.h:423 [inline] #1: 00000000d26a7517 (rcu_read_lock){....}, at: update_curr+0x2cc/0x8a0 kernel/sched/fair.c:828 ============================================= kobject: 'loop0' (000000007e212fbb): kobject_uevent_env NMI backtrace for cpu 1 CPU: 1 PID: 1037 Comm: khungtaskd Not tainted 4.19.80 #0 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+0x1b0/0x1f8 lib/nmi_backtrace.c:62 kobject: 'loop0' (000000007e212fbb): fill_kobj_path: path = '/devices/virtual/block/loop0' 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+0x354/0x420 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 12563 Comm: syz-executor434 Not tainted 4.19.80 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x50 kernel/kcov.c:100 Code: 65 ea ff 48 c7 05 d4 41 cd 08 00 00 00 00 e9 ca e9 ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 48 89 e5 48 8b 75 08 <65> 48 8b 04 25 40 ee 01 00 65 8b 15 78 26 97 7e 81 e2 00 01 1f 00 RSP: 0018:ffff8880922ff658 EFLAGS: 00000202 RAX: 0000000000000000 RBX: ffff8880a9c133f0 RCX: ffffffff81b848fe RDX: 0000000000000001 RSI: ffffffff81b84a13 RDI: 0000000000000001 RBP: ffff8880922ff658 R08: ffff88807b4042c0 R09: 0000000000000001 R10: ffffed1015d04732 R11: ffff8880ae823993 R12: dffffc0000000000 R13: 0000000000000106 R14: 0000000000000000 R15: 0000000000000001 FS: 00007f7c5a04c700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9376b2f000 CR3: 000000008e0c9000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: init_page_buffers+0x353/0x470 fs/buffer.c:912 grow_dev_page fs/buffer.c:955 [inline] grow_buffers fs/buffer.c:1017 [inline] __getblk_slow fs/buffer.c:1044 [inline] __getblk_gfp+0x798/0x970 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_read_tagged+0x50/0x530 fs/udf/misc.c:210 udf_check_anchor_block+0x1ef/0x680 fs/udf/super.c:1755 udf_scan_anchors+0x1cf/0x680 fs/udf/super.c:1795 udf_find_anchor fs/udf/super.c:1852 [inline] udf_load_vrs+0x67f/0xc80 fs/udf/super.c:1917 udf_fill_super+0x7cb/0x16f5 fs/udf/super.c:2112 mount_bdev+0x304/0x3c0 fs/super.c:1158 udf_mount+0x35/0x40 fs/udf/super.c:131 mount_fs+0xa8/0x31f fs/super.c:1261 vfs_kern_mount.part.0+0x6f/0x410 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2469 [inline] do_mount+0x53e/0x2bc0 fs/namespace.c:2799 ksys_mount+0xdb/0x150 fs/namespace.c:3015 __do_sys_mount fs/namespace.c:3029 [inline] __se_sys_mount fs/namespace.c:3026 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3026 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x44a789 Code: 4d cb 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 1b cb fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f7c5a04bdb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000006dbc38 RCX: 000000000044a789 RDX: 00000000200001c0 RSI: 0000000020000180 RDI: 0000000020000140 RBP: 00000000006dbc30 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc3c R13: 00007ffeb715481f R14: 00007f7c5a04c9c0 R15: 0000000000000000 UDF-fs: warning (device loop0): udf_load_vrs: No VRS found