INFO: task syz-executor.4:14728 blocked for more than 143 seconds. Not tainted 5.15.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:28496 pid:14728 ppid: 6581 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0xb72/0x1460 kernel/sched/core.c:6287 schedule+0x14b/0x210 kernel/sched/core.c:6366 rwsem_down_write_slowpath+0xdb7/0x1490 kernel/locking/rwsem.c:1107 __down_write_common kernel/locking/rwsem.c:1262 [inline] __down_write kernel/locking/rwsem.c:1271 [inline] down_write_nested+0x171/0x180 kernel/locking/rwsem.c:1628 lock_rename+0x182/0x1a0 do_renameat2+0x75d/0x1450 fs/namei.c:4720 __do_sys_rename fs/namei.c:4825 [inline] __se_sys_rename fs/namei.c:4823 [inline] __x64_sys_rename+0x82/0x90 fs/namei.c:4823 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7ff37a9c7ae9 RSP: 002b:00007ff377efb188 EFLAGS: 00000246 ORIG_RAX: 0000000000000052 RAX: ffffffffffffffda RBX: 00007ff37aadb0e0 RCX: 00007ff37a9c7ae9 RDX: 0000000000000000 RSI: 00000000200004c0 RDI: 0000000020000480 RBP: 00007ff37aa21f25 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd5773760f R14: 00007ff377efb300 R15: 0000000000022000 INFO: task syz-executor.4:14732 blocked for more than 143 seconds. Not tainted 5.15.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:28304 pid:14732 ppid: 6581 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0xb72/0x1460 kernel/sched/core.c:6287 schedule+0x14b/0x210 kernel/sched/core.c:6366 rwsem_down_read_slowpath+0x541/0x980 kernel/locking/rwsem.c:993 __down_read_common+0xaa/0x450 kernel/locking/rwsem.c:1214 inode_lock_shared include/linux/fs.h:796 [inline] lookup_slow fs/namei.c:1673 [inline] walk_component+0x508/0x790 fs/namei.c:1970 lookup_last fs/namei.c:2425 [inline] path_lookupat+0x19d/0x6c0 fs/namei.c:2449 filename_lookup+0x270/0x640 fs/namei.c:2478 user_path_at_empty+0x40/0x1a0 fs/namei.c:2801 user_path_at include/linux/namei.h:57 [inline] do_mount fs/namespace.c:3328 [inline] __do_sys_mount fs/namespace.c:3539 [inline] __se_sys_mount+0x2cd/0x3c0 fs/namespace.c:3516 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7ff37a9c7ae9 RSP: 002b:00007ff377eda188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ff37aadb1a0 RCX: 00007ff37a9c7ae9 RDX: 0000000020000280 RSI: 0000000020000080 RDI: 0000000000000000 RBP: 00007ff37aa21f25 R08: 00000000200002c0 R09: 0000000000000000 R10: 0000000001000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd5773760f R14: 00007ff377eda300 R15: 0000000000022000 INFO: task syz-executor.4:14737 blocked for more than 144 seconds. Not tainted 5.15.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:28208 pid:14737 ppid: 6581 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0xb72/0x1460 kernel/sched/core.c:6287 schedule+0x14b/0x210 kernel/sched/core.c:6366 rwsem_down_read_slowpath+0x541/0x980 kernel/locking/rwsem.c:993 __down_read_common+0xaa/0x450 kernel/locking/rwsem.c:1214 inode_lock_shared include/linux/fs.h:796 [inline] lookup_slow fs/namei.c:1673 [inline] walk_component+0x508/0x790 fs/namei.c:1970 lookup_last fs/namei.c:2425 [inline] path_lookupat+0x19d/0x6c0 fs/namei.c:2449 filename_lookup+0x270/0x640 fs/namei.c:2478 user_path_at_empty+0x40/0x1a0 fs/namei.c:2801 do_readlinkat+0x11b/0x3b0 fs/stat.c:443 __do_sys_readlinkat fs/stat.c:470 [inline] __se_sys_readlinkat fs/stat.c:467 [inline] __x64_sys_readlinkat+0x96/0xb0 fs/stat.c:467 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7ff37a9c7ae9 RSP: 002b:00007ff377eb9188 EFLAGS: 00000246 ORIG_RAX: 000000000000010b RAX: ffffffffffffffda RBX: 00007ff37aadb260 RCX: 00007ff37a9c7ae9 RDX: 0000000020000380 RSI: 0000000020000240 RDI: 0000000000000005 RBP: 00007ff37aa21f25 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000000cf R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd5773760f R14: 00007ff377eb9300 R15: 0000000000022000 INFO: task syz-executor.4:14779 blocked for more than 144 seconds. Not tainted 5.15.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:26032 pid:14779 ppid: 6581 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0xb72/0x1460 kernel/sched/core.c:6287 schedule+0x14b/0x210 kernel/sched/core.c:6366 rwsem_down_read_slowpath+0x541/0x980 kernel/locking/rwsem.c:993 __down_read_common+0xaa/0x450 kernel/locking/rwsem.c:1214 inode_lock_shared include/linux/fs.h:796 [inline] lookup_slow fs/namei.c:1673 [inline] walk_component+0x508/0x790 fs/namei.c:1970 lookup_last fs/namei.c:2425 [inline] path_lookupat+0x19d/0x6c0 fs/namei.c:2449 filename_lookup+0x270/0x640 fs/namei.c:2478 user_path_at_empty+0x40/0x1a0 fs/namei.c:2801 user_path_at include/linux/namei.h:57 [inline] __do_sys_chdir fs/open.c:489 [inline] __se_sys_chdir+0xa4/0x2a0 fs/open.c:483 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7ff37a9c7ae9 RSP: 002b:00007ff377e98188 EFLAGS: 00000246 ORIG_RAX: 0000000000000050 RAX: ffffffffffffffda RBX: 00007ff37aadb320 RCX: 00007ff37a9c7ae9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000040 RBP: 00007ff37aa21f25 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd5773760f R14: 00007ff377e98300 R15: 0000000000022000 INFO: task syz-executor.4:14782 blocked for more than 144 seconds. Not tainted 5.15.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:27664 pid:14782 ppid: 6581 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0xb72/0x1460 kernel/sched/core.c:6287 schedule+0x14b/0x210 kernel/sched/core.c:6366 rwsem_down_write_slowpath+0xdb7/0x1490 kernel/locking/rwsem.c:1107 __down_write_common kernel/locking/rwsem.c:1262 [inline] __down_write kernel/locking/rwsem.c:1271 [inline] down_write+0x165/0x170 kernel/locking/rwsem.c:1518 inode_lock include/linux/fs.h:786 [inline] open_last_lookups fs/namei.c:3349 [inline] path_openat+0x84a/0x3670 fs/namei.c:3558 do_filp_open+0x277/0x4f0 fs/namei.c:3588 do_sys_openat2+0x13b/0x500 fs/open.c:1200 do_sys_open fs/open.c:1216 [inline] __do_sys_creat fs/open.c:1290 [inline] __se_sys_creat fs/open.c:1284 [inline] __x64_sys_creat+0x11f/0x160 fs/open.c:1284 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7ff37a9c7ae9 RSP: 002b:00007ff377e77188 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00007ff37aadb3e0 RCX: 00007ff37a9c7ae9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000140 RBP: 00007ff37aa21f25 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd5773760f R14: 00007ff377e77300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/26: #0: ffffffff8c91c980 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 1 lock held by kswapd1/262: 5 locks held by kworker/u4:3/986: 1 lock held by in:imklog/6232: #0: ffff8880784345f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:990 2 locks held by kworker/u4:1/609: #0: ffff8880b9d31558 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x25/0x110 kernel/sched/core.c:474 #1: ffff8880b9d1f888 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x4c1/0x780 kernel/sched/psi.c:880 2 locks held by syz-executor.4/14723: 2 locks held by syz-executor.4/14728: #0: ffff88807b9f4460 (sb_writers#15){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:376 #1: ffff88806c53e6c0 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: lock_rename+0x182/0x1a0 1 lock held by syz-executor.4/14732: #0: ffff88806c53e6c0 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:796 [inline] #0: ffff88806c53e6c0 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lookup_slow fs/namei.c:1673 [inline] #0: ffff88806c53e6c0 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: walk_component+0x508/0x790 fs/namei.c:1970 1 lock held by syz-executor.4/14737: #0: ffff88806c53e6c0 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:796 [inline] #0: ffff88806c53e6c0 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lookup_slow fs/namei.c:1673 [inline] #0: ffff88806c53e6c0 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: walk_component+0x508/0x790 fs/namei.c:1970 1 lock held by syz-executor.4/14779: #0: ffff88806c53e6c0 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:796 [inline] #0: ffff88806c53e6c0 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lookup_slow fs/namei.c:1673 [inline] #0: ffff88806c53e6c0 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: walk_component+0x508/0x790 fs/namei.c:1970 2 locks held by syz-executor.4/14782: #0: ffff88807b9f4460 (sb_writers#15){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:376 #1: ffff88806c53e6c0 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:786 [inline] #1: ffff88806c53e6c0 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: open_last_lookups fs/namei.c:3349 [inline] #1: ffff88806c53e6c0 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: path_openat+0x84a/0x3670 fs/namei.c:3558 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 26 Comm: khungtaskd Not tainted 5.15.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1dc/0x2d8 lib/dump_stack.c:106 nmi_cpu_backtrace+0x45f/0x490 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xc82/0xcd0 kernel/hung_task.c:295 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 6221 Comm: kworker/1:4 Not tainted 5.15.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: 0x0 (wg-crypt-wg1) RIP: 0010:get_running_cputimer include/linux/sched/cputime.h:87 [inline] RIP: 0010:account_group_exec_runtime include/linux/sched/cputime.h:172 [inline] RIP: 0010:update_curr+0x5d6/0xd00 kernel/sched/fair.c:854 Code: 08 00 74 08 48 89 df e8 a8 99 71 00 48 8b 2b 48 8d 9d 90 01 00 00 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 8a 04 08 <84> c0 0f 85 1f 01 00 00 83 3b 00 0f 84 c3 fd ff ff 48 8b 1c 24 48 RSP: 0018:ffffc9000d367a18 EFLAGS: 00000802 RAX: 1ffff1100f695100 RBX: ffff88807b4a8810 RCX: dffffc0000000000 RDX: 1ffff92001a6cf2c RSI: 0000000000000002 RDI: 0000000000000000 RBP: ffff88807b4a8680 R08: dffffc0000000000 R09: ffffed10173a64a2 R10: ffffed10173a64a2 R11: 0000000000000000 R12: ffff8880b9d31628 R13: 0000005cb3a9563b R14: 1ffff110173a62c5 R15: ffff888088fad690 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5b94390000 CR3: 00000000330af000 CR4: 00000000003526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: dequeue_entity+0x27/0xcd0 kernel/sched/fair.c:4392 dequeue_task_fair+0x28f/0x1390 kernel/sched/fair.c:5720 dequeue_task kernel/sched/core.c:1996 [inline] deactivate_task kernel/sched/core.c:2010 [inline] __schedule+0x63c/0x1460 kernel/sched/core.c:6241 schedule+0x14b/0x210 kernel/sched/core.c:6366 worker_thread+0xfd5/0x1320 kernel/workqueue.c:2465 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 ---------------- Code disassembly (best guess): 0: 08 00 or %al,(%rax) 2: 74 08 je 0xc 4: 48 89 df mov %rbx,%rdi 7: e8 a8 99 71 00 callq 0x7199b4 c: 48 8b 2b mov (%rbx),%rbp f: 48 8d 9d 90 01 00 00 lea 0x190(%rbp),%rbx 16: 48 89 d8 mov %rbx,%rax 19: 48 c1 e8 03 shr $0x3,%rax 1d: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 24: fc ff df 27: 8a 04 08 mov (%rax,%rcx,1),%al * 2a: 84 c0 test %al,%al <-- trapping instruction 2c: 0f 85 1f 01 00 00 jne 0x151 32: 83 3b 00 cmpl $0x0,(%rbx) 35: 0f 84 c3 fd ff ff je 0xfffffdfe 3b: 48 8b 1c 24 mov (%rsp),%rbx 3f: 48 rex.W