UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256 UDF-fs: Scanning with blocksize 2048 failed UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512 UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop11): udf_load_vrs: No anchor found INFO: task syz-executor803:8628 blocked for more than 140 seconds. UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256, location=256 kobject: 'loop5' (00000000ebc0996d): kobject_uevent_env UDF-fs: Scanning with blocksize 1024 failed UDF-fs: warning (device loop7): udf_load_vrs: No anchor found UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256, location=256 Not tainted 5.0.0-rc2+ #33 kobject: 'loop5' (00000000ebc0996d): fill_kobj_path: path = '/devices/virtual/block/loop5' "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. UDF-fs: Scanning with blocksize 2048 failed UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512, location=512 syz-executor803 D26776 8628 8583 0x00000004 UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512 Call Trace: UDF-fs: warning (device loop9): udf_load_vrs: No anchor found UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512, location=512 context_switch kernel/sched/core.c:2831 [inline] __schedule+0x897/0x1e60 kernel/sched/core.c:3472 UDF-fs: Scanning with blocksize 4096 failed UDF-fs: warning (device loop7): udf_load_vrs: No anchor found UDF-fs: warning (device loop11): udf_load_vrs: No anchor found UDF-fs: warning (device loop9): udf_fill_super: No partition found (1) UDF-fs: Scanning with blocksize 4096 failed UDF-fs: Scanning with blocksize 2048 failed UDF-fs: warning (device loop7): udf_fill_super: No partition found (1) kobject: 'loop4' (00000000946e24c5): kobject_uevent_env kobject: 'loop4' (00000000946e24c5): fill_kobj_path: path = '/devices/virtual/block/loop4' UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256, location=256 schedule+0xfe/0x350 kernel/sched/core.c:3516 kobject: 'loop3' (00000000f2fe9be7): kobject_uevent_env UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512, location=512 UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512 kobject: 'loop4' (00000000946e24c5): kobject_uevent_env UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop11): udf_load_vrs: No anchor found kobject: 'loop4' (00000000946e24c5): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000f2fe9be7): fill_kobj_path: path = '/devices/virtual/block/loop3' UDF-fs: warning (device loop9): udf_load_vrs: No anchor found UDF-fs: warning (device loop7): udf_load_vrs: No anchor found __rwsem_down_write_failed_common+0xa4d/0x1620 kernel/locking/rwsem-xadd.c:577 UDF-fs: Scanning with blocksize 4096 failed UDF-fs: Scanning with blocksize 512 failed UDF-fs: Scanning with blocksize 512 failed UDF-fs: warning (device loop11): udf_fill_super: No partition found (1) kobject: 'loop3' (00000000f2fe9be7): kobject_uevent_env UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256, location=256 kobject: 'loop3' (00000000f2fe9be7): fill_kobj_path: path = '/devices/virtual/block/loop3' UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop11): udf_load_vrs: No anchor found UDF-fs: Scanning with blocksize 512 failed UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512 rwsem_down_write_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:606 UDF-fs: warning (device loop11): udf_load_vrs: No anchor found call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 UDF-fs: Scanning with blocksize 1024 failed __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0xa5/0x130 kernel/locking/rwsem.c:72 UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256, location=256 grab_super+0xbf/0x410 fs/super.c:384 UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop11): udf_load_vrs: No anchor found sget_userns+0x442/0xf50 fs/super.c:512 UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256, location=256 UDF-fs: Scanning with blocksize 2048 failed UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512, location=512 UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256 UDF-fs: warning (device loop9): udf_load_vrs: No anchor found UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop11): udf_load_vrs: No anchor found UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512, location=512 UDF-fs: Scanning with blocksize 1024 failed UDF-fs: Scanning with blocksize 4096 failed UDF-fs: warning (device loop7): udf_load_vrs: No anchor found UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256, location=256 UDF-fs: warning (device loop11): udf_fill_super: No partition found (1) UDF-fs: Scanning with blocksize 1024 failed UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512, location=512 UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256 UDF-fs: warning (device loop9): udf_load_vrs: No anchor found UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512, location=512 UDF-fs: Scanning with blocksize 2048 failed sget+0x10c/0x150 fs/super.c:571 UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256, location=256 UDF-fs: warning (device loop7): udf_load_vrs: No anchor found mount_bdev+0xff/0x3c0 fs/super.c:1132 UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512, location=512 UDF-fs: Scanning with blocksize 2048 failed udf_mount+0x35/0x40 fs/udf/super.c:131 mount_fs+0x123/0x43a fs/super.c:1258 UDF-fs: warning (device loop9): udf_load_vrs: No anchor found UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256 UDF-fs: Scanning with blocksize 4096 failed vfs_kern_mount.part.0+0xdb/0x570 fs/namespace.c:959 UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop9): udf_fill_super: No partition found (1) UDF-fs: warning (device loop7): udf_load_vrs: No anchor found vfs_kern_mount fs/namespace.c:949 [inline] do_new_mount fs/namespace.c:2513 [inline] do_mount+0x58e/0x3330 fs/namespace.c:2847 UDF-fs: Scanning with blocksize 4096 failed UDF-fs: warning (device loop7): udf_fill_super: No partition found (1) ksys_mount+0xdb/0x150 fs/namespace.c:3063 __do_sys_mount fs/namespace.c:3077 [inline] __se_sys_mount fs/namespace.c:3074 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3074 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x44ab59 Code: 7d 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 4b cb fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fb59f4e7ce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000006dcc58 RCX: 000000000044ab59 RDX: 0000000020000100 RSI: 0000000020000080 RDI: 00000000200002c0 RBP: 00000000006dcc50 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc5c R13: 00007fff3f236c2f R14: 00007fb59f4e89c0 R15: 00000000006dcd2c INFO: task syz-executor803:8633 blocked for more than 140 seconds. Not tainted 5.0.0-rc2+ #33 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor803 D26776 8633 8582 0x00000004 Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x897/0x1e60 kernel/sched/core.c:3472 schedule+0xfe/0x350 kernel/sched/core.c:3516 __rwsem_down_write_failed_common+0xa4d/0x1620 kernel/locking/rwsem-xadd.c:577 rwsem_down_write_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:606 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0xa5/0x130 kernel/locking/rwsem.c:72 grab_super+0xbf/0x410 fs/super.c:384 sget_userns+0x442/0xf50 fs/super.c:512 sget+0x10c/0x150 fs/super.c:571 mount_bdev+0xff/0x3c0 fs/super.c:1132 udf_mount+0x35/0x40 fs/udf/super.c:131 mount_fs+0x123/0x43a fs/super.c:1258 vfs_kern_mount.part.0+0xdb/0x570 fs/namespace.c:959 vfs_kern_mount fs/namespace.c:949 [inline] do_new_mount fs/namespace.c:2513 [inline] do_mount+0x58e/0x3330 fs/namespace.c:2847 ksys_mount+0xdb/0x150 fs/namespace.c:3063 __do_sys_mount fs/namespace.c:3077 [inline] __se_sys_mount fs/namespace.c:3074 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3074 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x44ab59 Code: 7d 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 4b cb fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fb59f508ce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000006dcc48 RCX: 000000000044ab59 RDX: 0000000020000100 RSI: 0000000020000080 RDI: 00000000200002c0 RBP: 00000000006dcc40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc4c R13: 00007fff3f236c2f R14: 00007fb59f5099c0 R15: 00000000006dcd2c INFO: task syz-executor803:8632 blocked for more than 140 seconds. kobject: 'loop4' (00000000946e24c5): kobject_uevent_env Not tainted 5.0.0-rc2+ #33 kobject: 'loop4' (00000000946e24c5): fill_kobj_path: path = '/devices/virtual/block/loop4' "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor803 D26776 8632 8581 0x00000004 kobject: 'loop5' (00000000ebc0996d): kobject_uevent_env kobject: 'loop5' (00000000ebc0996d): fill_kobj_path: path = '/devices/virtual/block/loop5' Call Trace: print_req_error: 195 callbacks suppressed print_req_error: I/O error, dev loop9, sector 64 flags 0 print_req_error: I/O error, dev loop7, sector 64 flags 0 print_req_error: I/O error, dev loop9, sector 256 flags 0 print_req_error: I/O error, dev loop7, sector 256 flags 0 UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256 context_switch kernel/sched/core.c:2831 [inline] __schedule+0x897/0x1e60 kernel/sched/core.c:3472 print_req_error: I/O error, dev loop11, sector 64 flags 0 kobject: 'loop4' (00000000946e24c5): kobject_uevent_env print_req_error: I/O error, dev loop9, sector 512 flags 0 UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512, location=512 kobject: 'loop4' (00000000946e24c5): fill_kobj_path: path = '/devices/virtual/block/loop4' UDF-fs: warning (device loop9): udf_load_vrs: No anchor found print_req_error: I/O error, dev loop7, sector 512 flags 0 UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512, location=512 UDF-fs: Scanning with blocksize 512 failed print_req_error: I/O error, dev loop9, sector 64 flags 0 UDF-fs: warning (device loop7): udf_load_vrs: No anchor found print_req_error: I/O error, dev loop11, sector 256 flags 0 UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256, location=256 print_req_error: I/O error, dev loop11, sector 512 flags 0 UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512 UDF-fs: Scanning with blocksize 512 failed schedule+0xfe/0x350 kernel/sched/core.c:3516 UDF-fs: warning (device loop11): udf_load_vrs: No anchor found UDF-fs: Scanning with blocksize 512 failed __rwsem_down_write_failed_common+0xa4d/0x1620 kernel/locking/rwsem-xadd.c:577 UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512, location=512 rwsem_down_write_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:606 UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256, location=256 UDF-fs: warning (device loop7): udf_load_vrs: No anchor found call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0xa5/0x130 kernel/locking/rwsem.c:72 UDF-fs: Scanning with blocksize 1024 failed UDF-fs: warning (device loop11): udf_load_vrs: No anchor found UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256 grab_super+0xbf/0x410 fs/super.c:384 UDF-fs: Scanning with blocksize 1024 failed UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512, location=512 UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop7): udf_load_vrs: No anchor found sget_userns+0x442/0xf50 fs/super.c:512 UDF-fs: warning (device loop11): udf_load_vrs: No anchor found UDF-fs: Scanning with blocksize 2048 failed UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256, location=256 UDF-fs: error (device loop7): udf_read_tagged: read failed, block=256, location=256 UDF-fs: Scanning with blocksize 2048 failed UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512, location=512 UDF-fs: error (device loop7): udf_read_tagged: read failed, block=512, location=512 UDF-fs: error (device loop11): udf_read_tagged: read failed, block=256, location=256 UDF-fs: warning (device loop7): udf_load_vrs: No anchor found UDF-fs: warning (device loop9): udf_load_vrs: No anchor found UDF-fs: Scanning with blocksize 4096 failed UDF-fs: error (device loop11): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop7): udf_fill_super: No partition found (1) UDF-fs: Scanning with blocksize 1024 failed UDF-fs: warning (device loop11): udf_load_vrs: No anchor found UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256, location=256 UDF-fs: Scanning with blocksize 4096 failed UDF-fs: warning (device loop11): udf_fill_super: No partition found (1) UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop9): udf_load_vrs: No anchor found sget+0x10c/0x150 fs/super.c:571 mount_bdev+0xff/0x3c0 fs/super.c:1132 udf_mount+0x35/0x40 fs/udf/super.c:131 UDF-fs: Scanning with blocksize 2048 failed mount_fs+0x123/0x43a fs/super.c:1258 UDF-fs: error (device loop9): udf_read_tagged: read failed, block=256, location=256 vfs_kern_mount.part.0+0xdb/0x570 fs/namespace.c:959 UDF-fs: error (device loop9): udf_read_tagged: read failed, block=512, location=512 UDF-fs: warning (device loop9): udf_load_vrs: No anchor found vfs_kern_mount fs/namespace.c:949 [inline] do_new_mount fs/namespace.c:2513 [inline] do_mount+0x58e/0x3330 fs/namespace.c:2847 UDF-fs: Scanning with blocksize 4096 failed UDF-fs: warning (device loop9): udf_fill_super: No partition found (1) ksys_mount+0xdb/0x150 fs/namespace.c:3063 __do_sys_mount fs/namespace.c:3077 [inline] __se_sys_mount fs/namespace.c:3074 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3074 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x44ab59 Code: 7d 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 4b cb fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fb59f4e7ce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000006dcc58 RCX: 000000000044ab59 RDX: 0000000020000100 RSI: 0000000020000080 RDI: 00000000200002c0 RBP: 00000000006dcc50 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc5c R13: 00007fff3f236c2f R14: 00007fb59f4e89c0 R15: 00000000006dcd2c Showing all locks held in the system: 1 lock held by khungtaskd/1040: #0: 000000004f3320ac (rcu_read_lock){....}, at: debug_show_all_locks+0xc6/0x41d kernel/locking/lockdep.c:4389 1 lock held by rsyslogd/8429: #0: 00000000c930eb51 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1b3/0x1f0 fs/file.c:795 2 locks held by getty/8551: #0: 000000000df86f10 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000038ef30f5 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 2 locks held by getty/8552: #0: 00000000442b86b5 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000a09d5b92 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 2 locks held by getty/8553: #0: 000000008b74e211 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000ce7e8801 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 2 locks held by getty/8554: #0: 00000000f7c268d8 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000009ace3a8f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 2 locks held by getty/8555: #0: 000000003bd41137 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000075a6692 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 2 locks held by getty/8556: #0: 0000000073c98a0b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000a4745bde (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 2 locks held by getty/8557: #0: 00000000749102c9 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000ce4b9fc2 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 1 lock held by syz-executor803/8596: 2 locks held by syz-executor803/8628: #0: 000000008da206e7 (&bdev->bd_fsfreeze_mutex){+.+.}, at: mount_bdev+0x93/0x3c0 fs/super.c:1126 #1: 000000004555a3cd (&type->s_umount_key#52){+.+.}, at: grab_super+0xbf/0x410 fs/super.c:384 1 lock held by syz-executor803/8594: 2 locks held by syz-executor803/8633: #0: 000000000e255cb0 (&bdev->bd_fsfreeze_mutex){+.+.}, at: mount_bdev+0x93/0x3c0 fs/super.c:1126 #1: 00000000a268cd3f (&type->s_umount_key#52){+.+.}, at: grab_super+0xbf/0x410 fs/super.c:384 1 lock held by syz-executor803/8598: 2 locks held by syz-executor803/8632: #0: 00000000a5e1ca0c (&bdev->bd_fsfreeze_mutex){+.+.}, at: mount_bdev+0x93/0x3c0 fs/super.c:1126 #1: 00000000a8b2191a (&type->s_umount_key#52){+.+.}, at: grab_super+0xbf/0x410 fs/super.c:384 2 locks held by syz-executor803/12078: #0: 00000000f19fb5d9 (&bdev->bd_mutex){+.+.}, at: __blkdev_put+0xbb/0x830 fs/block_dev.c:1806 #1: 000000001e70e4ef (loop_ctl_mutex){+.+.}, at: lo_release+0x1f/0x200 drivers/block/loop.c:1741 1 lock held by syz-executor803/12084: #0: 000000004038d88e (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x19b/0x1400 fs/block_dev.c:1489 2 locks held by syz-executor803/12073: #0: 0000000070b697a6 (&bdev->bd_mutex){+.+.}, at: __blkdev_put+0xbb/0x830 fs/block_dev.c:1806 #1: 000000001e70e4ef (loop_ctl_mutex){+.+.}, at: lo_release+0x1f/0x200 drivers/block/loop.c:1741 1 lock held by syz-executor803/12077: #0: 000000001e70e4ef (loop_ctl_mutex){+.+.}, at: __loop_clr_fd+0x88/0xc90 drivers/block/loop.c:1046 1 lock held by syz-executor803/12086: #0: 000000003cb63823 (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x19b/0x1400 fs/block_dev.c:1489 2 locks held by syz-executor803/12075: #0: 00000000c35d043e (&bdev->bd_mutex){+.+.}, at: __blkdev_put+0xbb/0x830 fs/block_dev.c:1806 #1: 000000001e70e4ef (loop_ctl_mutex){+.+.}, at: lo_release+0x1f/0x200 drivers/block/loop.c:1741 2 locks held by blkid/12079: #0: 000000004038d88e (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x19b/0x1400 fs/block_dev.c:1489 #1: 000000001e70e4ef (loop_ctl_mutex){+.+.}, at: lo_open+0x1d/0xd0 drivers/block/loop.c:1722 2 locks held by blkid/12080: #0: 000000003cb63823 (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x19b/0x1400 fs/block_dev.c:1489 #1: 000000001e70e4ef (loop_ctl_mutex){+.+.}, at: lo_open+0x1d/0xd0 drivers/block/loop.c:1722 kobject: 'loop4' (00000000946e24c5): kobject_uevent_env ============================================= kobject: 'loop4' (00000000946e24c5): fill_kobj_path: path = '/devices/virtual/block/loop4' NMI backtrace for cpu 1 CPU: 1 PID: 1040 Comm: khungtaskd Not tainted 5.0.0-rc2+ #33 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+0x1db/0x2d0 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+0xbbb/0x1170 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 1 to CPUs 0: INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.374 msecs NMI backtrace for cpu 0 CPU: 0 PID: 12079 Comm: blkid Not tainted 5.0.0-rc2+ #33 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_acquire+0x281/0x4a30 kernel/locking/lockdep.c:3279 Code: 83 bc 24 98 00 00 00 00 0f 85 50 08 00 00 4c 03 94 24 88 00 00 00 44 89 fe 66 81 e6 ff 1f 49 8d 42 20 48 89 c2 48 89 44 24 78 <48> b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 14 02 84 d2 74 09 RSP: 0018:ffff8880944ceec0 EFLAGS: 00000002 RAX: ffff8880a88b4ae0 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff8880a88b4ae0 RSI: 0000000000000057 RDI: ffff8880a88b4ac0 RBP: ffff8880944cf148 R08: 0000000000000000 R09: 0000000000000001 R10: ffff8880a88b4ac0 R11: ffffffff89a88680 R12: ffff8880a88b4240 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000057 FS: 00007f0f86c85740(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe3a80ecc8 CR3: 000000008f5dc000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3841 __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0x12f/0x1670 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 kernfs_dop_revalidate+0x9f/0x3c0 fs/kernfs/dir.c:570 d_revalidate fs/namei.c:767 [inline] d_revalidate fs/namei.c:764 [inline] lookup_fast+0xbf0/0x1260 fs/namei.c:1620 walk_component+0x110/0x26a0 fs/namei.c:1806 link_path_walk.part.0+0xa57/0x1550 fs/namei.c:2141 link_path_walk fs/namei.c:2072 [inline] path_openat+0x222/0x5650 fs/namei.c:3533 do_filp_open+0x26f/0x370 fs/namei.c:3564 do_sys_open+0x59a/0x7c0 fs/open.c:1063 __do_sys_open fs/open.c:1081 [inline] __se_sys_open fs/open.c:1076 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1076 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f0f8658d120 Code: 48 8b 15 1b 4d 2b 00 f7 d8 64 89 02 83 c8 ff c3 90 90 90 90 90 90 90 90 90 90 83 3d d5 a4 2b 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 5e 8c 01 00 48 89 04 24 RSP: 002b:00007ffe3a80ecc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007ffe3a80fd10 RCX: 00007f0f8658d120 RDX: 00007ffe3a80ece2 RSI: 0000000000000000 RDI: 00007ffe3a80ecd0 RBP: 0000000000000705 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe3a810d88 R13: 0000000000000000 R14: 00007f0f86a6e820 R15: 00007f0f868642a2