INFO: task syz-executor.5:30739 blocked for more than 143 seconds. Not tainted 5.15.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:27496 pid:30739 ppid: 30319 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0x940/0x26f0 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6425 __mutex_lock_common kernel/locking/mutex.c:669 [inline] __mutex_lock+0xa34/0x12f0 kernel/locking/mutex.c:729 io_uring_del_tctx_node+0x105/0x350 fs/io_uring.c:9706 io_uring_clean_tctx fs/io_uring.c:9722 [inline] io_uring_cancel_generic+0x5cb/0x760 fs/io_uring.c:9810 io_uring_files_cancel include/linux/io_uring.h:16 [inline] do_exit+0x265/0x2a30 kernel/exit.c:780 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x47f/0x2160 kernel/signal.c:2868 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f12388ec709 RSP: 002b:00007f1235e63188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: 0000000000000022 RBX: 00007f12389f0f60 RCX: 00007f12388ec709 RDX: 0000000000000000 RSI: 0000000000000022 RDI: 0000000000000003 RBP: 00007f1238946cb4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f1238f24b2f R14: 00007f1235e63300 R15: 0000000000022000 INFO: task syz-executor.5:30786 blocked for more than 143 seconds. Not tainted 5.15.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:28152 pid:30786 ppid: 30319 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0x940/0x26f0 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6425 __mutex_lock_common kernel/locking/mutex.c:669 [inline] __mutex_lock+0xa34/0x12f0 kernel/locking/mutex.c:729 io_uring_del_tctx_node+0x105/0x350 fs/io_uring.c:9706 io_uring_clean_tctx fs/io_uring.c:9722 [inline] io_uring_cancel_generic+0x5cb/0x760 fs/io_uring.c:9810 io_uring_files_cancel include/linux/io_uring.h:16 [inline] do_exit+0x265/0x2a30 kernel/exit.c:780 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x47f/0x2160 kernel/signal.c:2868 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f12388ec709 RSP: 002b:00007f1235e21218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f12389f10e8 RCX: 00007f12388ec709 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f12389f10e8 RBP: 00007f12389f10e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f12389f10ec R13: 00007f1238f24b2f R14: 00007f1235e21300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/26: #0: ffffffff8b97fe60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 1 lock held by in:imklog/6231: #0: ffff888073338870 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 1 lock held by syz-executor.5/30739: #0: ffff8880562480a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_uring_del_tctx_node+0x105/0x350 fs/io_uring.c:9706 1 lock held by syz-executor.5/30740: 1 lock held by syz-executor.5/30786: #0: ffff8880389540a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_uring_del_tctx_node+0x105/0x350 fs/io_uring.c:9706 1 lock held by syz-executor.5/30791: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 26 Comm: khungtaskd Not tainted 5.15.0-rc3-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+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1ae/0x220 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+0xc1d/0xf50 kernel/hung_task.c:295 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 2959 Comm: systemd-journal Not tainted 5.15.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__sanitizer_cov_trace_cmp4+0x6b/0x70 kernel/kcov.c:259 Code: 00 00 00 48 39 fe 72 22 44 89 c6 48 83 c2 01 48 89 4c 38 f0 48 c7 44 38 e0 04 00 00 00 48 89 74 38 e8 4e 89 54 c8 20 48 89 10 0f 1f 40 00 53 41 89 fb 41 89 f1 bf 03 00 00 00 65 48 8b 0c 25 RSP: 0018:ffffc900020afa10 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffffffff8b83f688 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff88807bb71c80 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff81724bfd R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffffffff8b83f680 R15: 0000000000000001 FS: 00007f029a09f8c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f02976fa000 CR3: 000000001c524000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: map_id_range_down_base kernel/user_namespace.c:288 [inline] map_id_range_down+0x10d/0x340 kernel/user_namespace.c:302 map_id_down kernel/user_namespace.c:317 [inline] make_kuid+0x1e/0x30 kernel/user_namespace.c:394 kuid_into_mnt include/linux/fs.h:1640 [inline] i_uid_into_mnt include/linux/fs.h:1668 [inline] acl_permission_check fs/namei.c:341 [inline] generic_permission+0x88/0x5b0 fs/namei.c:403 do_inode_permission fs/namei.c:464 [inline] inode_permission.part.0+0x95/0x440 fs/namei.c:524 inode_permission fs/namei.c:505 [inline] may_lookup fs/namei.c:1683 [inline] link_path_walk.part.0+0x277/0xd00 fs/namei.c:2239 link_path_walk fs/namei.c:2221 [inline] path_lookupat+0xc8/0x860 fs/namei.c:2448 filename_lookup+0x1c6/0x590 fs/namei.c:2478 user_path_at_empty+0x42/0x60 fs/namei.c:2801 user_path_at include/linux/namei.h:57 [inline] do_faccessat+0x127/0x850 fs/open.c:421 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f029935a9c7 Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007fff6b1ae7e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00007fff6b1b1700 RCX: 00007f029935a9c7 RDX: 00007f0299dcba00 RSI: 0000000000000000 RDI: 0000558bb17649a3 RBP: 00007fff6b1ae820 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fff6b1b1700 R15: 00007fff6b1aed10 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 00 00 add %al,(%rax) 2: 48 39 fe cmp %rdi,%rsi 5: 72 22 jb 0x29 7: 44 89 c6 mov %r8d,%esi a: 48 83 c2 01 add $0x1,%rdx e: 48 89 4c 38 f0 mov %rcx,-0x10(%rax,%rdi,1) 13: 48 c7 44 38 e0 04 00 movq $0x4,-0x20(%rax,%rdi,1) 1a: 00 00 1c: 48 89 74 38 e8 mov %rsi,-0x18(%rax,%rdi,1) 21: 4e 89 54 c8 20 mov %r10,0x20(%rax,%r9,8) 26: 48 89 10 mov %rdx,(%rax) * 29: c3 retq <-- trapping instruction 2a: 0f 1f 40 00 nopl 0x0(%rax) 2e: 53 push %rbx 2f: 41 89 fb mov %edi,%r11d 32: 41 89 f1 mov %esi,%r9d 35: bf 03 00 00 00 mov $0x3,%edi 3a: 65 gs 3b: 48 rex.W 3c: 8b .byte 0x8b 3d: 0c 25 or $0x25,%al