INFO: task syz-executor.3:16367 blocked for more than 143 seconds. Not tainted 5.10.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:28856 pid:16367 ppid: 8482 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x8eb/0x21b0 kernel/sched/core.c:5078 schedule+0xcf/0x270 kernel/sched/core.c:5157 rwsem_down_write_slowpath+0x809/0x1220 kernel/locking/rwsem.c:1106 __down_write_common kernel/locking/rwsem.c:1261 [inline] __down_write_common kernel/locking/rwsem.c:1258 [inline] __down_write kernel/locking/rwsem.c:1270 [inline] down_write_nested+0x136/0x150 kernel/locking/rwsem.c:1517 inode_lock_nested include/linux/fs.h:808 [inline] filename_create+0x15a/0x490 fs/namei.c:3467 user_path_create fs/namei.c:3525 [inline] do_mkdirat+0xa0/0x2d0 fs/namei.c:3665 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e149 RSP: 002b:00007f5bad4a2c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 000000000045e149 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000080 RBP: 000000000119c060 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c034 R13: 00007ffdff891b1f R14: 00007f5bad4a39c0 R15: 000000000119c034 INFO: task syz-executor.3:16370 blocked for more than 143 seconds. Not tainted 5.10.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:27768 pid:16370 ppid: 8482 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x8eb/0x21b0 kernel/sched/core.c:5078 schedule+0xcf/0x270 kernel/sched/core.c:5157 rwsem_down_write_slowpath+0x809/0x1220 kernel/locking/rwsem.c:1106 __down_write_common kernel/locking/rwsem.c:1261 [inline] __down_write_common kernel/locking/rwsem.c:1258 [inline] __down_write kernel/locking/rwsem.c:1270 [inline] down_write+0x132/0x150 kernel/locking/rwsem.c:1407 inode_lock include/linux/fs.h:773 [inline] lock_mount+0x8a/0x2e0 fs/namespace.c:2192 do_new_mount_fc fs/namespace.c:2818 [inline] do_new_mount fs/namespace.c:2877 [inline] path_mount+0x1787/0x20c0 fs/namespace.c:3205 do_mount fs/namespace.c:3218 [inline] __do_sys_mount fs/namespace.c:3426 [inline] __se_sys_mount fs/namespace.c:3403 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3403 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e149 RSP: 002b:00007f5bad481c68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045e149 RDX: 0000000020002100 RSI: 00000000200042c0 RDI: 0000000000000000 RBP: 000000000119c120 R08: 0000000020002140 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c0dc R13: 00007ffdff891b1f R14: 00007f5bad4829c0 R15: 000000000119c0dc Showing all locks held in the system: 1 lock held by ksoftirqd/0/10: 3 locks held by kworker/u4:1/22: 1 lock held by khungtaskd/1611: #0: ffffffff8b78e0e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x28c kernel/locking/lockdep.c:6254 1 lock held by in:imklog/8170: #0: ffff88802517b1b0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:947 2 locks held by syz-executor.3/16363: 2 locks held by syz-executor.3/16367: #0: ffff8880790da460 (sb_writers#19){.+.+}-{0:0}, at: filename_create+0x104/0x490 fs/namei.c:3462 #1: ffff888074e0f310 (&type->i_mutex_dir_key#9/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:808 [inline] #1: ffff888074e0f310 (&type->i_mutex_dir_key#9/1){+.+.}-{3:3}, at: filename_create+0x15a/0x490 fs/namei.c:3467 1 lock held by syz-executor.3/16370: #0: ffff888074e0f310 (&type->i_mutex_dir_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:773 [inline] #0: ffff888074e0f310 (&type->i_mutex_dir_key#9){++++}-{3:3}, at: lock_mount+0x8a/0x2e0 fs/namespace.c:2192 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1611 Comm: khungtaskd Not tainted 5.10.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x3c/0xef lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0xe36/0x10b0 kernel/hung_task.c:294 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4889 Comm: systemd-journal Not tainted 5.10.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:check_kcov_mode+0x7/0x40 kernel/kcov.c:163 Code: fe ff ff 48 89 df e8 78 e7 42 00 e9 a1 fe ff ff 48 8b 3c 24 e8 6a e7 42 00 e9 18 fe ff ff cc cc cc cc cc 65 8b 05 29 d8 8f 7e <89> c2 81 e2 00 01 00 00 a9 00 01 ff 00 74 10 31 c0 85 d2 74 15 8b RSP: 0018:ffffc900014c7a88 EFLAGS: 00000002 RAX: 0000000080000001 RBX: 00000000ffffef73 RCX: 00000000ffffef73 RDX: 1ffffffff16ec345 RSI: ffff888014f801c0 RDI: 0000000000000003 RBP: ffffc900014c7c50 R08: 00000000ffffef73 R09: ffffffff8b761a2f R10: ffffffff815a732d R11: 0000000000000001 R12: 00000000ffffef73 R13: 80000000ffffef73 R14: 0000000000000002 R15: ffffffff8b6ef6c8 FS: 00007fca4ba318c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fca48f65028 CR3: 0000000014ea5000 CR4: 00000000001526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: write_comp_data kernel/kcov.c:218 [inline] __sanitizer_cov_trace_cmp8+0x1d/0x70 kernel/kcov.c:264 get_desc_state kernel/printk/printk_ringbuffer.c:417 [inline] desc_read+0x26d/0x350 kernel/printk/printk_ringbuffer.c:529 desc_read_finalized_seq+0x81/0x1c0 kernel/printk/printk_ringbuffer.c:1752 prb_read kernel/printk/printk_ringbuffer.c:1800 [inline] _prb_read_valid+0x1cd/0x700 kernel/printk/printk_ringbuffer.c:1880 prb_read_valid+0x75/0xa0 kernel/printk/printk_ringbuffer.c:1929 devkmsg_read+0x13f/0x740 kernel/printk/printk.c:723 vfs_read+0x1b5/0x570 fs/read_write.c:494 ksys_read+0x12d/0x250 fs/read_write.c:634 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7fca4afc1210 Code: 73 01 c3 48 8b 0d 98 7d 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d b9 c1 20 00 00 75 10 b8 00 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 4e fc ff ff 48 89 04 24 RSP: 002b:00007fff5202fd48 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007fff520327c0 RCX: 00007fca4afc1210 RDX: 0000000000002000 RSI: 00007fff520305c0 RDI: 0000000000000009 RBP: 0000000000000000 R08: 0000000000000008 R09: 00007fff520710f0 R10: 0000000000023e82 R11: 0000000000000246 R12: 00007fff520305c0 R13: 00007fff52032718 R14: 0000561276095958 R15: 0005b6b434c1638f