INFO: task syz-executor029:10386 blocked for more than 143 seconds. Not tainted 5.15.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor029 state:D stack:26288 pid:10386 ppid: 6539 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 schedule_timeout+0xac/0x300 kernel/time/timer.c:1857 do_wait_for_common+0x2da/0x480 kernel/sched/completion.c:85 __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x48/0x60 kernel/sched/completion.c:138 __flush_work kernel/workqueue.c:3083 [inline] __cancel_work_timer+0x562/0x710 kernel/workqueue.c:3170 p9_conn_destroy net/9p/trans_fd.c:886 [inline] p9_fd_close+0x248/0x3c0 net/9p/trans_fd.c:921 p9_client_destroy+0xde/0x700 net/9p/client.c:1090 v9fs_session_close+0x4d/0x200 fs/9p/v9fs.c:499 v9fs_kill_super+0x58/0x90 fs/9p/vfs_super.c:224 deactivate_locked_super+0xa7/0xf0 fs/super.c:335 v9fs_mount+0x70e/0x870 fs/9p/vfs_super.c:205 legacy_get_tree+0xea/0x180 fs/fs_context.c:610 vfs_get_tree+0x86/0x270 fs/super.c:1498 do_new_mount fs/namespace.c:2988 [inline] path_mount+0x1986/0x2c30 fs/namespace.c:3318 do_mount fs/namespace.c:3331 [inline] __do_sys_mount fs/namespace.c:3539 [inline] __se_sys_mount+0x308/0x3c0 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: 0033:0x7f5a715b7d49 RSP: 002b:00007f5a715692f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f5a7163f4c0 RCX: 00007f5a715b7d49 RDX: 0000000020000280 RSI: 0000000020000140 RDI: 0000000000000000 RBP: 00007f5a7160d07c R08: 00000000200005c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e R13: 6d6d3d6568636163 R14: 64663d736e617274 R15: 00007f5a7163f4c8 INFO: task syz-executor029:12748 blocked for more than 143 seconds. Not tainted 5.15.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor029 state:D stack:25680 pid:12748 ppid: 6540 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 schedule_timeout+0xac/0x300 kernel/time/timer.c:1857 do_wait_for_common+0x2da/0x480 kernel/sched/completion.c:85 __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x48/0x60 kernel/sched/completion.c:138 __flush_work kernel/workqueue.c:3083 [inline] __cancel_work_timer+0x562/0x710 kernel/workqueue.c:3170 p9_conn_destroy net/9p/trans_fd.c:886 [inline] p9_fd_close+0x248/0x3c0 net/9p/trans_fd.c:921 p9_client_destroy+0xde/0x700 net/9p/client.c:1090 v9fs_session_close+0x4d/0x200 fs/9p/v9fs.c:499 v9fs_kill_super+0x58/0x90 fs/9p/vfs_super.c:224 deactivate_locked_super+0xa7/0xf0 fs/super.c:335 v9fs_mount+0x70e/0x870 fs/9p/vfs_super.c:205 legacy_get_tree+0xea/0x180 fs/fs_context.c:610 vfs_get_tree+0x86/0x270 fs/super.c:1498 do_new_mount fs/namespace.c:2988 [inline] path_mount+0x1986/0x2c30 fs/namespace.c:3318 do_mount fs/namespace.c:3331 [inline] __do_sys_mount fs/namespace.c:3539 [inline] __se_sys_mount+0x308/0x3c0 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: 0033:0x7f5a715b7d49 RSP: 002b:00007f5a715692f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f5a7163f4c0 RCX: 00007f5a715b7d49 RDX: 0000000020000280 RSI: 0000000020000140 RDI: 0000000000000000 RBP: 00007f5a7160d07c R08: 00000000200005c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e R13: 6d6d3d6568636163 R14: 64663d736e617274 R15: 00007f5a7163f4c8 INFO: task syz-executor029:14156 blocked for more than 144 seconds. Not tainted 5.15.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor029 state:D stack:26064 pid:14156 ppid: 6535 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 schedule_timeout+0xac/0x300 kernel/time/timer.c:1857 do_wait_for_common+0x2da/0x480 kernel/sched/completion.c:85 __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x48/0x60 kernel/sched/completion.c:138 __flush_work kernel/workqueue.c:3083 [inline] __cancel_work_timer+0x562/0x710 kernel/workqueue.c:3170 p9_conn_destroy net/9p/trans_fd.c:886 [inline] p9_fd_close+0x248/0x3c0 net/9p/trans_fd.c:921 p9_client_destroy+0xde/0x700 net/9p/client.c:1090 v9fs_session_close+0x4d/0x200 fs/9p/v9fs.c:499 v9fs_kill_super+0x58/0x90 fs/9p/vfs_super.c:224 deactivate_locked_super+0xa7/0xf0 fs/super.c:335 v9fs_mount+0x70e/0x870 fs/9p/vfs_super.c:205 legacy_get_tree+0xea/0x180 fs/fs_context.c:610 vfs_get_tree+0x86/0x270 fs/super.c:1498 do_new_mount fs/namespace.c:2988 [inline] path_mount+0x1986/0x2c30 fs/namespace.c:3318 do_mount fs/namespace.c:3331 [inline] __do_sys_mount fs/namespace.c:3539 [inline] __se_sys_mount+0x308/0x3c0 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: 0033:0x7f5a715b7d49 RSP: 002b:00007f5a715692f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f5a7163f4c0 RCX: 00007f5a715b7d49 RDX: 0000000020000280 RSI: 0000000020000140 RDI: 0000000000000000 RBP: 00007f5a7160d07c R08: 00000000200005c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e R13: 6d6d3d6568636163 R14: 64663d736e617274 R15: 00007f5a7163f4c8 Showing all locks held in the system: 2 locks held by kworker/0:1/7: #0: ffff888011064d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7ca/0x1140 #1: ffffc90000cc7d20 ((work_completion)(&m->rq)){+.+.}-{0:0}, at: process_one_work+0x808/0x1140 kernel/workqueue.c:2272 1 lock held by khungtaskd/27: #0: ffffffff8c91c8c0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 2 locks held by kworker/0:3/1266: #0: ffff888011066538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x7ca/0x1140 #1: ffffc90005457d20 ((work_completion)(&rew.rew_work)){+.+.}-{0:0}, at: process_one_work+0x808/0x1140 kernel/workqueue.c:2272 1 lock held by in:imklog/6215: #0: ffff888024124af0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:990 2 locks held by kworker/1:2/6563: #0: ffff888011064d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7ca/0x1140 #1: ffffc900021cfd20 ((work_completion)(&m->rq)){+.+.}-{0:0}, at: process_one_work+0x808/0x1140 kernel/workqueue.c:2272 2 locks held by kworker/0:0/6599: #0: ffff888011064d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7ca/0x1140 #1: ffffc9000235fd20 ((work_completion)(&m->rq)){+.+.}-{0:0}, at: process_one_work+0x808/0x1140 kernel/workqueue.c:2272 1 lock held by syz-executor029/13719: #0: ffffffff8c9210a8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline] #0: ffffffff8c9210a8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x277/0x750 kernel/rcu/tree_exp.h:837 1 lock held by syz-executor029/13737: #0: ffffffff8c9210a8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:322 [inline] #0: ffffffff8c9210a8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x356/0x750 kernel/rcu/tree_exp.h:837 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.0-rc6-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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 13744 Comm: systemd-udevd Not tainted 5.15.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:check_kcov_mode kernel/kcov.c:165 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x2d/0x60 kernel/kcov.c:197 Code: 24 65 48 8b 0c 25 c0 ef 01 00 65 8b 15 14 66 7e 7e f7 c2 00 01 ff 00 74 11 f7 c2 00 01 00 00 74 35 83 b9 64 15 00 00 00 74 2c <8b> 91 40 15 00 00 83 fa 02 75 21 48 8b 91 48 15 00 00 48 8b 32 48 RSP: 0018:ffffc900021bf998 EFLAGS: 00000246 RAX: ffffffff83d9c340 RBX: 0000000000000000 RCX: ffff888023bc8000 RDX: 0000000080000000 RSI: 0000000000000004 RDI: 0000000000000020 RBP: 0000000000000004 R08: ffffffff83d9c332 R09: ffffffff83d9d971 R10: 0000000000000003 R11: ffff888023bc8000 R12: dffffc0000000000 R13: ffffc900021bfac0 R14: ffff888023b84200 R15: 0000000000000014 FS: 00007fe4680378c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe466e63780 CR3: 0000000025ade000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: tomoyo_check_path_acl+0x70/0x1c0 security/tomoyo/file.c:258 tomoyo_check_acl+0x137/0x430 security/tomoyo/domain.c:175 tomoyo_path_permission+0x1af/0x370 security/tomoyo/file.c:586 tomoyo_path_perm+0x3dd/0x660 security/tomoyo/file.c:838 tomoyo_path_unlink+0xcc/0x100 security/tomoyo/tomoyo.c:149 security_path_unlink+0xc3/0x140 security/security.c:1155 do_unlinkat+0x408/0xa10 fs/namei.c:4165 __do_sys_unlink fs/namei.c:4217 [inline] __se_sys_unlink fs/namei.c:4215 [inline] __x64_sys_unlink+0x45/0x50 fs/namei.c:4215 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: 0033:0x7fe466eab0e7 Code: f0 ff ff 73 01 c3 48 8b 0d ae bd 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 81 bd 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007ffe79b635a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe466eab0e7 RDX: 00303434392d7039 RSI: 000055608fee1460 RDI: 00007ffe79b635b0 RBP: 00007ffe79b63600 R08: 000055608fee10c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000055608fee1460 R13: 000055608fee2680 R14: 0000000000000003 R15: 000000000000000e ---------------- Code disassembly (best guess): 0: 24 65 and $0x65,%al 2: 48 8b 0c 25 c0 ef 01 mov 0x1efc0,%rcx 9: 00 a: 65 8b 15 14 66 7e 7e mov %gs:0x7e7e6614(%rip),%edx # 0x7e7e6625 11: f7 c2 00 01 ff 00 test $0xff0100,%edx 17: 74 11 je 0x2a 19: f7 c2 00 01 00 00 test $0x100,%edx 1f: 74 35 je 0x56 21: 83 b9 64 15 00 00 00 cmpl $0x0,0x1564(%rcx) 28: 74 2c je 0x56 * 2a: 8b 91 40 15 00 00 mov 0x1540(%rcx),%edx <-- trapping instruction 30: 83 fa 02 cmp $0x2,%edx 33: 75 21 jne 0x56 35: 48 8b 91 48 15 00 00 mov 0x1548(%rcx),%rdx 3c: 48 8b 32 mov (%rdx),%rsi 3f: 48 rex.W