INFO: task syz-executor.4:9976 can't die for more than 143 seconds. syz-executor.4 D27840 9976 7556 0x00004004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 io_schedule+0x17/0x60 kernel/sched/core.c:5806 bit_wait_io+0x12/0x90 kernel/sched/wait_bit.c:209 __wait_on_bit+0x5e/0x190 kernel/sched/wait_bit.c:49 out_of_line_wait_on_bit+0xd5/0x110 kernel/sched/wait_bit.c:64 wait_on_bit_io include/linux/wait_bit.h:101 [inline] __wait_on_buffer fs/buffer.c:122 [inline] wait_on_buffer include/linux/buffer_head.h:354 [inline] __bread_slow fs/buffer.c:1249 [inline] __bread_gfp+0x2b2/0x370 fs/buffer.c:1430 sb_bread include/linux/buffer_head.h:307 [inline] bfs_fill_super+0x178/0xeb0 fs/bfs/inode.c:332 mount_bdev+0x305/0x3c0 fs/super.c:1417 legacy_get_tree+0x105/0x220 fs/fs_context.c:622 vfs_get_tree+0x89/0x2f0 fs/super.c:1547 do_new_mount fs/namespace.c:2813 [inline] do_mount+0x1306/0x1b30 fs/namespace.c:3138 __do_sys_mount fs/namespace.c:3347 [inline] __se_sys_mount fs/namespace.c:3324 [inline] __x64_sys_mount+0x18f/0x230 fs/namespace.c:3324 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca29 Code: Bad RIP value. RSP: 002b:00007f0ba8416c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000004f6280 RCX: 000000000045ca29 RDX: 00000000200000c0 RSI: 0000000020000040 RDI: 0000000020000000 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000751 R14: 00000000004ca3aa R15: 00007f0ba84176d4 INFO: task syz-executor.4:9976 blocked for more than 143 seconds. Not tainted 5.7.0-rc1-next-20200415-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D27840 9976 7556 0x00004004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 io_schedule+0x17/0x60 kernel/sched/core.c:5806 bit_wait_io+0x12/0x90 kernel/sched/wait_bit.c:209 __wait_on_bit+0x5e/0x190 kernel/sched/wait_bit.c:49 out_of_line_wait_on_bit+0xd5/0x110 kernel/sched/wait_bit.c:64 wait_on_bit_io include/linux/wait_bit.h:101 [inline] __wait_on_buffer fs/buffer.c:122 [inline] wait_on_buffer include/linux/buffer_head.h:354 [inline] __bread_slow fs/buffer.c:1249 [inline] __bread_gfp+0x2b2/0x370 fs/buffer.c:1430 sb_bread include/linux/buffer_head.h:307 [inline] bfs_fill_super+0x178/0xeb0 fs/bfs/inode.c:332 mount_bdev+0x305/0x3c0 fs/super.c:1417 legacy_get_tree+0x105/0x220 fs/fs_context.c:622 vfs_get_tree+0x89/0x2f0 fs/super.c:1547 do_new_mount fs/namespace.c:2813 [inline] do_mount+0x1306/0x1b30 fs/namespace.c:3138 __do_sys_mount fs/namespace.c:3347 [inline] __se_sys_mount fs/namespace.c:3324 [inline] __x64_sys_mount+0x18f/0x230 fs/namespace.c:3324 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca29 Code: Bad RIP value. RSP: 002b:00007f0ba8416c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000004f6280 RCX: 000000000045ca29 RDX: 00000000200000c0 RSI: 0000000020000040 RDI: 0000000020000000 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000751 R14: 00000000004ca3aa R15: 00007f0ba84176d4 Showing all locks held in the system: 1 lock held by khungtaskd/1167: #0: ffffffff899befc0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5754 1 lock held by in:imklog/6879: #0: ffff8880a9345af0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:826 1 lock held by syz-executor.4/9976: #0: ffff88805c96e0e0 (&type->s_umount_key#51/1){+.+.}-{3:3}, at: alloc_super+0x1b3/0x9d0 fs/super.c:229 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1167 Comm: khungtaskd Not tainted 5.7.0-rc1-next-20200415-syzkaller #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+0x188/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x231/0x27e lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:147 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:249 [inline] watchdog+0xde3/0x14e0 kernel/hung_task.c:333 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4279 Comm: systemd-journal Not tainted 5.7.0-rc1-next-20200415-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:163 [inline] RIP: 0010:unwind_next_frame+0x243/0x19d0 arch/x86/kernel/unwind_orc.c:407 Code: 53 ff 39 d0 0f 83 30 01 00 00 48 ba 00 00 00 00 00 fc ff df 89 c6 48 8d 3c b5 dc 45 73 8b 49 89 f8 49 c1 e8 03 45 0f b6 04 10 <48> 89 fa 83 e2 07 83 c2 03 44 38 c2 7c 32 45 84 c0 74 2d 48 89 74 RSP: 0018:ffffc90004c6f770 EFLAGS: 00000802 RAX: 000000000000b12b RBX: 1ffff9200098def6 RCX: ffffffff81b12b46 RDX: dffffc0000000000 RSI: 000000000000b12b RDI: ffffffff8b760a88 RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8afd2e44 R10: 0000000000028664 R11: 000000000007001f R12: ffffc90004c6f890 R13: ffffc90004c6f87d R14: ffffc90004c6f898 R15: ffffc90004c6f848 FS: 00007f5b21ef38c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2072fa5000 CR3: 0000000092d9e000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: arch_stack_walk+0x74/0xd0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:123 save_stack+0x1b/0x40 mm/kasan/common.c:49 set_track mm/kasan/common.c:57 [inline] kasan_set_free_info mm/kasan/common.c:317 [inline] __kasan_slab_free+0xf7/0x140 mm/kasan/common.c:456 __cache_free mm/slab.c:3426 [inline] kmem_cache_free+0x7f/0x320 mm/slab.c:3694 putname+0xe1/0x120 fs/namei.c:259 filename_parentat.isra.0+0x38c/0x400 fs/namei.c:2403 filename_create+0x9e/0x4a0 fs/namei.c:3427 user_path_create fs/namei.c:3502 [inline] do_mkdirat+0xa0/0x280 fs/namei.c:3640 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x7f5b211af687 Code: 00 b8 ff ff ff ff c3 0f 1f 40 00 48 8b 05 09 d8 2b 00 64 c7 00 5f 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 d7 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007ffc1ce82cf8 EFLAGS: 00000293 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007ffc1ce85c10 RCX: 00007f5b211af687 RDX: 00007f5b21c20a00 RSI: 00000000000001ed RDI: 000055d9ca8a28a0 RBP: 00007ffc1ce82d30 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000069 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ffc1ce85c10 R15: 00007ffc1ce83220