overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir INFO: task syz-executor.1:9092 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 overlayfs: filesystem on './bus' not supported as upperdir "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. overlayfs: filesystem on './bus' not supported as upperdir syz-executor.1 D28648 9092 8121 0x00000004 overlayfs: filesystem on './bus' not supported as upperdir Call Trace: overlayfs: filesystem on './bus' not supported as upperdir context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir schedule+0x8d/0x1b0 kernel/sched/core.c:3561 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:589 [inline] rwsem_down_write_failed+0x3aa/0x760 kernel/locking/rwsem-xadd.c:618 overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir BFS-fs: bfs_fill_super(): No BFS filesystem on loop4 (magic=adface00) overlayfs: filesystem on './bus' not supported as upperdir call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0x4f/0x90 kernel/locking/rwsem.c:72 overlayfs: filesystem on './bus' not supported as upperdir inode_lock include/linux/fs.h:748 [inline] fuse_flush+0x1fd/0x5b0 fs/fuse/file.c:421 overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir filp_close+0xb4/0x160 fs/open.c:1162 overlayfs: filesystem on './bus' not supported as upperdir __close_fd+0x133/0x200 fs/file.c:636 __do_sys_close fs/open.c:1181 [inline] __se_sys_close fs/open.c:1179 [inline] __x64_sys_close+0x69/0x100 fs/open.c:1179 overlayfs: filesystem on './bus' not supported as upperdir do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 overlayfs: filesystem on './bus' not supported as upperdir entry_SYSCALL_64_after_hwframe+0x49/0xbe overlayfs: filesystem on './bus' not supported as upperdir RIP: 0033:0x7ff5adece43b Code: Bad RIP value. overlayfs: filesystem on './bus' not supported as upperdir RSP: 002b:00007ffc94b47b50 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007ff5adece43b overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir RDX: 0000001b2f020000 RSI: 0000001b2f025e64 RDI: 0000000000000004 overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir RBP: 00007ff5ae03f980 R08: 0000000000000000 R09: 000000003253460c overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir R10: 001659a3a0c5da82 R11: 0000000000000293 R12: 000000000008ec2c overlayfs: filesystem on './bus' not supported as upperdir R13: 00007ffc94b47c50 R14: 00007ff5ae03df80 R15: 0000000000000032 overlayfs: filesystem on './bus' not supported as upperdir INFO: task syz-executor.1:9114 blocked for more than 140 seconds. overlayfs: filesystem on './bus' not supported as upperdir Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. overlayfs: filesystem on './bus' not supported as upperdir syz-executor.1 D28520 9114 8121 0x00000004 Call Trace: overlayfs: filesystem on './bus' not supported as upperdir context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir schedule+0x8d/0x1b0 kernel/sched/core.c:3561 fuse_wait_on_page_writeback fs/fuse/file.c:383 [inline] fuse_wait_on_page_writeback.isra.0+0x11b/0x170 fs/fuse/file.c:379 overlayfs: filesystem on './bus' not supported as upperdir fuse_launder_page fs/fuse/file.c:2033 [inline] fuse_launder_page+0xb6/0xe0 fs/fuse/file.c:2026 do_launder_page mm/truncate.c:655 [inline] invalidate_inode_pages2_range+0x795/0x1110 mm/truncate.c:725 overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir fuse_finish_open+0x2e2/0x590 fs/fuse/file.c:182 fuse_open_common+0x254/0x2c0 fs/fuse/file.c:222 do_dentry_open+0x4aa/0x1160 fs/open.c:796 do_last fs/namei.c:3421 [inline] path_openat+0x793/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_sys_open+0x3b3/0x520 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7ff5adf1c669 Code: Bad RIP value. RSP: 002b:00007ff5ac86f168 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00007ff5ae03e050 RCX: 00007ff5adf1c669 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200001c0 RBP: 00007ff5adf77560 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc94b47aef R14: 00007ff5ac86f300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1570: #0: 00000000d3e3030b (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by in:imklog/7735: #0: 000000009cfdffd0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 2 locks held by kworker/1:3/8976: #0: 000000005328d597 ((wq_completion)"rcu_gp"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 00000000ea9c0b8d ((work_completion)(&rew.rew_work)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 5 locks held by kworker/u4:38/17852: #0: 00000000367d078a ((wq_completion)"%s""netns"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 00000000234c1666 (net_cleanup_work){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 #2: 0000000061f47c6e (pernet_ops_rwsem){++++}, at: cleanup_net+0xa8/0x8b0 net/core/net_namespace.c:521 #3: 000000004948ac4c (rtnl_mutex){+.+.}, at: ip6gre_exit_batch_net+0x82/0x6c0 net/ipv6/ip6_gre.c:1632 #4: 00000000fb37767c (rcu_preempt_state.exp_mutex){+.+.}, at: exp_funnel_lock kernel/rcu/tree_exp.h:297 [inline] #4: 00000000fb37767c (rcu_preempt_state.exp_mutex){+.+.}, at: _synchronize_rcu_expedited+0x4dc/0x6f0 kernel/rcu/tree_exp.h:667 1 lock held by syz-executor.1/9092: #0: 000000001afb4732 (&sb->s_type->i_mutex_key#34){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] #0: 000000001afb4732 (&sb->s_type->i_mutex_key#34){+.+.}, at: fuse_flush+0x1fd/0x5b0 fs/fuse/file.c:421 2 locks held by syz-executor.1/9114: #0: 00000000d0bb34ef (sb_writers#26){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 00000000d0bb34ef (sb_writers#26){.+.+}, at: mnt_want_write+0x3a/0xb0 fs/namespace.c:360 #1: 000000001afb4732 (&sb->s_type->i_mutex_key#34){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] #1: 000000001afb4732 (&sb->s_type->i_mutex_key#34){+.+.}, at: fuse_open_common+0x1bc/0x2c0 fs/fuse/file.c:215 1 lock held by syz-executor.1/18158: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 kthread+0x33f/0x460 kernel/kthread.c:259 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: 8097 Comm: syz-fuzzer Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 RIP: 0033:0x4137cd Code: c1 e8 0d 48 25 ff 1f 00 00 48 8b 94 c2 00 00 20 00 48 89 f0 eb 02 31 d2 48 89 54 24 20 48 85 d2 0f 84 8e 00 00 00 40 8a 72 63 <40> 80 fe 01 75 13 4c 8b 42 18 4c 39 c0 72 0a 0f 1f 40 00 48 39 42 RSP: 002b:000000c00017fe48 EFLAGS: 00000206 RAX: 000000c00eb207e0 RBX: 000000c00eb24340 RCX: 0000000000000008 RDX: 00007fb50d097fc0 RSI: 000000c00eb20701 RDI: 0000000000836ae0 RBP: 000000c00017fe70 R08: 0000000000000001 R09: 00007fb50d31021a R10: ffffffffffffc4a0 R11: 00007fb50d3b6fff R12: 000000c00eb24340 R13: 000000c00eb207e0 R14: 000000c000082b60 R15: 00007fb50b4c3f1c FS: 000000c00037c890 GS: 0000000000000000