INFO: task syz-executor.2:2962 blocked for more than 143 seconds. Not tainted 5.3.0-rc6+ #121 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D29408 2962 11216 0x00000004 Call Trace: context_switch kernel/sched/core.c:3254 [inline] __schedule+0x755/0x1580 kernel/sched/core.c:3880 schedule+0xd9/0x260 kernel/sched/core.c:3947 rwsem_down_write_slowpath+0x708/0xf60 kernel/locking/rwsem.c:1214 __down_write kernel/locking/rwsem.c:1365 [inline] down_write_nested+0x140/0x160 kernel/locking/rwsem.c:1597 inode_lock_nested include/linux/fs.h:813 [inline] filename_create+0x17c/0x4f0 fs/namei.c:3634 user_path_create fs/namei.c:3692 [inline] do_mkdirat+0xb5/0x2a0 fs/namei.c:3830 __do_sys_mkdir fs/namei.c:3854 [inline] __se_sys_mkdir fs/namei.c:3852 [inline] __x64_sys_mkdir+0x5c/0x80 fs/namei.c:3852 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459879 Code: 30 48 c7 44 24 38 00 00 00 00 48 c7 44 24 40 00 00 00 00 48 c7 44 24 48 00 00 00 00 e8 b0 67 ff ff 48 8b 44 24 50 48 8b 4c 24 <58> 48 89 01 48 8b 6c 24 60 48 83 c4 68 c3 e8 14 06 fd ff 0f 0b e8 RSP: 002b:00007f7704672c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000459879 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000040 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f77046736d4 R13: 00000000004bf081 R14: 00000000004da720 R15: 00000000ffffffff INFO: task syz-executor.2:2963 blocked for more than 143 seconds. Not tainted 5.3.0-rc6+ #121 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D29072 2963 11216 0x00000004 Call Trace: context_switch kernel/sched/core.c:3254 [inline] __schedule+0x755/0x1580 kernel/sched/core.c:3880 schedule+0xd9/0x260 kernel/sched/core.c:3947 rwsem_down_read_slowpath+0x4cc/0xfb0 kernel/locking/rwsem.c:1090 __down_read kernel/locking/rwsem.c:1320 [inline] down_read+0x1f4/0x3f0 kernel/locking/rwsem.c:1463 inode_lock_shared include/linux/fs.h:788 [inline] lookup_slow+0x4a/0x80 fs/namei.c:1685 walk_component+0x747/0x2000 fs/namei.c:1808 lookup_last fs/namei.c:2271 [inline] path_lookupat.isra.0+0x1f5/0x8d0 fs/namei.c:2316 filename_lookup+0x1b0/0x410 fs/namei.c:2346 user_path_at_empty+0x43/0x50 fs/namei.c:2606 user_path include/linux/namei.h:65 [inline] do_mount+0x150/0x1c30 fs/namespace.c:3049 ksys_mount+0xdb/0x150 fs/namespace.c:3320 __do_sys_mount fs/namespace.c:3334 [inline] __se_sys_mount fs/namespace.c:3331 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3331 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459879 Code: 30 48 c7 44 24 38 00 00 00 00 48 c7 44 24 40 00 00 00 00 48 c7 44 24 48 00 00 00 00 e8 b0 67 ff ff 48 8b 44 24 50 48 8b 4c 24 <58> 48 89 01 48 8b 6c 24 60 48 83 c4 68 c3 e8 14 06 fd ff 0f 0b e8 RSP: 002b:00007f7704651c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000459879 RDX: 0000000020000300 RSI: 0000000020000200 RDI: 0000000000000000 RBP: 000000000075c070 R08: 00000000200005c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f77046526d4 R13: 00000000004c5e2f R14: 00000000004da930 R15: 00000000ffffffff INFO: task syz-executor.2:2964 blocked for more than 143 seconds. Not tainted 5.3.0-rc6+ #121 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28656 2964 11216 0x00000004 Call Trace: context_switch kernel/sched/core.c:3254 [inline] __schedule+0x755/0x1580 kernel/sched/core.c:3880 schedule+0xd9/0x260 kernel/sched/core.c:3947 rwsem_down_read_slowpath+0x4cc/0xfb0 kernel/locking/rwsem.c:1090 __down_read kernel/locking/rwsem.c:1320 [inline] down_read+0x1f4/0x3f0 kernel/locking/rwsem.c:1463 inode_lock_shared include/linux/fs.h:788 [inline] lookup_slow+0x4a/0x80 fs/namei.c:1685 walk_component+0x747/0x2000 fs/namei.c:1808 lookup_last fs/namei.c:2271 [inline] path_lookupat.isra.0+0x1f5/0x8d0 fs/namei.c:2316 filename_lookup+0x1b0/0x410 fs/namei.c:2346 user_path_at_empty+0x43/0x50 fs/namei.c:2606 user_path_at include/linux/namei.h:60 [inline] ksys_chdir+0x98/0x1f0 fs/open.c:459 __do_sys_chdir fs/open.c:481 [inline] __se_sys_chdir fs/open.c:479 [inline] __x64_sys_chdir+0x31/0x40 fs/open.c:479 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459879 Code: 30 48 c7 44 24 38 00 00 00 00 48 c7 44 24 40 00 00 00 00 48 c7 44 24 48 00 00 00 00 e8 b0 67 ff ff 48 8b 44 24 50 48 8b 4c 24 <58> 48 89 01 48 8b 6c 24 60 48 83 c4 68 c3 e8 14 06 fd ff 0f 0b e8 RSP: 002b:00007f7704630c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000050 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000459879 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000000 RBP: 000000000075c118 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f77046316d4 R13: 00000000004bf0ea R14: 00000000004d1a20 R15: 00000000ffffffff INFO: lockdep is turned off. NMI backtrace for cpu 1 CPU: 1 PID: 1057 Comm: khungtaskd Not tainted 5.3.0-rc6+ #121 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+0x70/0xb2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x23b/0x28b 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:205 [inline] watchdog+0x9d0/0xef0 kernel/hung_task.c:289 kthread+0x361/0x430 kernel/kthread.c:255 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 skipped: idling at native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60