FAULT_INJECTION: forcing a failure. name fail_usercopy, interval 1, probability 0, space 0, times 0 ====================================================== WARNING: possible circular locking dependency detected 6.11.0-rc7-syzkaller-00097-g196145c606d0 #0 Not tainted ------------------------------------------------------ syz.0.2420/15262 is trying to acquire lock: ffffffff8e613cb8 ((console_sem).lock){-.-.}-{2:2}, at: down_trylock+0x20/0xa0 kernel/locking/semaphore.c:139 but task is already holding lock: ffff8880b883e998 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xb0/0x140 kernel/sched/core.c:568 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&rq->__lock){-.-.}-{2:2}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759 _raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378 raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:560 raw_spin_rq_lock kernel/sched/sched.h:1415 [inline] rq_lock kernel/sched/sched.h:1714 [inline] task_fork_fair+0x61/0x1e0 kernel/sched/fair.c:12710 sched_cgroup_fork+0x37c/0x410 kernel/sched/core.c:4633 copy_process+0x2217/0x3dc0 kernel/fork.c:2483 kernel_clone+0x223/0x880 kernel/fork.c:2781 user_mode_thread+0x132/0x1a0 kernel/fork.c:2859 rest_init+0x23/0x300 init/main.c:712 start_kernel+0x47a/0x500 init/main.c:1103 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:507 x86_64_start_kernel+0x9f/0xa0 arch/x86/kernel/head64.c:488 common_startup_64+0x13e/0x147 -> #1 (&p->pi_lock){-.-.}-{2:2}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162 class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:551 [inline] try_to_wake_up+0xb0/0x1470 kernel/sched/core.c:4051 up+0x72/0x90 kernel/locking/semaphore.c:191 __up_console_sem kernel/printk/printk.c:340 [inline] __console_unlock kernel/printk/printk.c:2802 [inline] console_unlock+0x20d/0x4d0 kernel/printk/printk.c:3121 vprintk_emit+0x5dc/0x7c0 kernel/printk/printk.c:2348 _printk+0xd5/0x120 kernel/printk/printk.c:2373 __show_regs+0xf5/0x610 arch/x86/kernel/process_64.c:83 show_trace_log_lvl+0x3d4/0x520 arch/x86/kernel/dumpstack.c:301 __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 fail_dump lib/fault-inject.c:52 [inline] should_fail_ex+0x3b0/0x4e0 lib/fault-inject.c:153 should_failslab+0xac/0x100 mm/failslab.c:45 slab_pre_alloc_hook mm/slub.c:3945 [inline] slab_alloc_node mm/slub.c:4021 [inline] __do_kmalloc_node mm/slub.c:4161 [inline] __kmalloc_noprof+0xd8/0x400 mm/slub.c:4174 kmalloc_noprof include/linux/slab.h:685 [inline] tomoyo_realpath_from_path+0xcf/0x5e0 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_number_perm+0x23a/0x880 security/tomoyo/file.c:723 security_file_ioctl+0x75/0xb0 security/security.c:2791 __do_sys_ioctl fs/ioctl.c:901 [inline] __se_sys_ioctl+0x47/0x170 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 ((console_sem).lock){-.-.}-{2:2}: check_prev_add kernel/locking/lockdep.c:3133 [inline] check_prevs_add kernel/locking/lockdep.c:3252 [inline] validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3868 __lock_acquire+0x137a/0x2040 kernel/locking/lockdep.c:5142 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162 down_trylock+0x20/0xa0 kernel/locking/semaphore.c:139 __down_trylock_console_sem+0x109/0x250 kernel/printk/printk.c:323 console_trylock kernel/printk/printk.c:2755 [inline] console_trylock_spinning kernel/printk/printk.c:1958 [inline] vprintk_emit+0x2aa/0x7c0 kernel/printk/printk.c:2347 _printk+0xd5/0x120 kernel/printk/printk.c:2373 fail_dump lib/fault-inject.c:45 [inline] should_fail_ex+0x391/0x4e0 lib/fault-inject.c:153 strncpy_from_user+0x36/0x2e0 lib/strncpy_from_user.c:118 strncpy_from_user_nofault+0x71/0x140 mm/maccess.c:186 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:216 [inline] ____bpf_probe_read_user_str kernel/trace/bpf_trace.c:225 [inline] bpf_probe_read_user_str+0x2a/0x70 kernel/trace/bpf_trace.c:222 bpf_prog_bc7c5c6b9645592f+0x3d/0x3f bpf_dispatcher_nop_func include/linux/bpf.h:1243 [inline] __bpf_prog_run include/linux/filter.h:691 [inline] bpf_prog_run include/linux/filter.h:698 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2406 [inline] bpf_trace_run4+0x334/0x590 kernel/trace/bpf_trace.c:2449 __traceiter_sched_switch+0x98/0xd0 include/trace/events/sched.h:222 trace_sched_switch include/trace/events/sched.h:222 [inline] __schedule+0x253f/0x4a10 kernel/sched/core.c:6526 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6851 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707 do_msgsnd+0x124/0x13f0 ipc/msg.c:857 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: (console_sem).lock --> &p->pi_lock --> &rq->__lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&rq->__lock); lock(&p->pi_lock); lock(&rq->__lock); lock((console_sem).lock); *** DEADLOCK *** 2 locks held by syz.0.2420/15262: #0: ffff8880b883e998 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xb0/0x140 kernel/sched/core.c:568 #1: ffffffff8e738320 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline] #1: ffffffff8e738320 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline] #1: ffffffff8e738320 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2405 [inline] #1: ffffffff8e738320 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run4+0x244/0x590 kernel/trace/bpf_trace.c:2449 stack backtrace: CPU: 0 UID: 0 PID: 15262 Comm: syz.0.2420 Not tainted 6.11.0-rc7-syzkaller-00097-g196145c606d0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2186 check_prev_add kernel/locking/lockdep.c:3133 [inline] check_prevs_add kernel/locking/lockdep.c:3252 [inline] validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3868 __lock_acquire+0x137a/0x2040 kernel/locking/lockdep.c:5142 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162 down_trylock+0x20/0xa0 kernel/locking/semaphore.c:139 __down_trylock_console_sem+0x109/0x250 kernel/printk/printk.c:323 console_trylock kernel/printk/printk.c:2755 [inline] console_trylock_spinning kernel/printk/printk.c:1958 [inline] vprintk_emit+0x2aa/0x7c0 kernel/printk/printk.c:2347 _printk+0xd5/0x120 kernel/printk/printk.c:2373 fail_dump lib/fault-inject.c:45 [inline] should_fail_ex+0x391/0x4e0 lib/fault-inject.c:153 strncpy_from_user+0x36/0x2e0 lib/strncpy_from_user.c:118 strncpy_from_user_nofault+0x71/0x140 mm/maccess.c:186 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:216 [inline] ____bpf_probe_read_user_str kernel/trace/bpf_trace.c:225 [inline] bpf_probe_read_user_str+0x2a/0x70 kernel/trace/bpf_trace.c:222 bpf_prog_bc7c5c6b9645592f+0x3d/0x3f bpf_dispatcher_nop_func include/linux/bpf.h:1243 [inline] __bpf_prog_run include/linux/filter.h:691 [inline] bpf_prog_run include/linux/filter.h:698 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2406 [inline] bpf_trace_run4+0x334/0x590 kernel/trace/bpf_trace.c:2449 __traceiter_sched_switch+0x98/0xd0 include/trace/events/sched.h:222 trace_sched_switch include/trace/events/sched.h:222 [inline] __schedule+0x253f/0x4a10 kernel/sched/core.c:6526 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6851 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707 RIP: 0010:do_msgsnd+0x124/0x13f0 ipc/msg.c:857 Code: 00 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 2f ab 9b fd 48 8b 1b 48 83 c3 10 48 89 d8 48 c1 e8 03 42 80 3c 20 00 <74> 08 48 89 df e8 12 ab 9b fd 48 8b 03 48 89 44 24 40 48 8d 98 4c RSP: 0018:ffffc900097d7d40 EFLAGS: 00000246 RAX: 1ffff11003a5b41c RBX: ffff88801d2da0e0 RCX: ffff8880263fda00 RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffffc900097d7e48 RBP: ffffc900097d7f00 R08: 0000000000000000 R09: 1ffffffff1fee945 R10: dffffc0000000000 R11: fffffbfff1fee946 R12: dffffc0000000000 R13: 00000000200000c8 R14: 0000000000000000 R15: 0000000000000003 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f3e5137def9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f3e5221d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000045 RAX: ffffffffffffffda RBX: 00007f3e51536058 RCX: 00007f3e5137def9 RDX: 0000000000000008 RSI: 00000000200000c0 RDI: 0000000000000000 RBP: 00007f3e5221d090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000001 R14: 00007f3e51536058 R15: 00007ffcbe7d9758 CPU: 0 UID: 0 PID: 15262 Comm: syz.0.2420 Not tainted 6.11.0-rc7-syzkaller-00097-g196145c606d0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 fail_dump lib/fault-inject.c:52 [inline] should_fail_ex+0x3b0/0x4e0 lib/fault-inject.c:153 strncpy_from_user+0x36/0x2e0 lib/strncpy_from_user.c:118 strncpy_from_user_nofault+0x71/0x140 mm/maccess.c:186 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:216 [inline] ____bpf_probe_read_user_str kernel/trace/bpf_trace.c:225 [inline] bpf_probe_read_user_str+0x2a/0x70 kernel/trace/bpf_trace.c:222 bpf_prog_bc7c5c6b9645592f+0x3d/0x3f bpf_dispatcher_nop_func include/linux/bpf.h:1243 [inline] __bpf_prog_run include/linux/filter.h:691 [inline] bpf_prog_run include/linux/filter.h:698 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2406 [inline] bpf_trace_run4+0x334/0x590 kernel/trace/bpf_trace.c:2449 __traceiter_sched_switch+0x98/0xd0 include/trace/events/sched.h:222 trace_sched_switch include/trace/events/sched.h:222 [inline] __schedule+0x253f/0x4a10 kernel/sched/core.c:6526 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6851 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707 RIP: 0010:do_msgsnd+0x124/0x13f0 ipc/msg.c:857 Code: 00 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 2f ab 9b fd 48 8b 1b 48 83 c3 10 48 89 d8 48 c1 e8 03 42 80 3c 20 00 <74> 08 48 89 df e8 12 ab 9b fd 48 8b 03 48 89 44 24 40 48 8d 98 4c RSP: 0018:ffffc900097d7d40 EFLAGS: 00000246 RAX: 1ffff11003a5b41c RBX: ffff88801d2da0e0 RCX: ffff8880263fda00 RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffffc900097d7e48 RBP: ffffc900097d7f00 R08: 0000000000000000 R09: 1ffffffff1fee945 R10: dffffc0000000000 R11: fffffbfff1fee946 R12: dffffc0000000000 R13: 00000000200000c8 R14: 0000000000000000 R15: 0000000000000003 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f3e5137def9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f3e5221d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000045 RAX: ffffffffffffffda RBX: 00007f3e51536058 RCX: 00007f3e5137def9 RDX: 0000000000000008 RSI: 00000000200000c0 RDI: 0000000000000000 RBP: 00007f3e5221d090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000001 R14: 00007f3e51536058 R15: 00007ffcbe7d9758 audit: audit_backlog=65 > audit_backlog_limit=64 audit: audit_lost=259087 audit_rate_limit=0 audit_backlog_limit=64 audit: backlog limit exceeded audit: audit_backlog=65 > audit_backlog_limit=64 audit: audit_lost=259088 audit_rate_limit=0 audit_backlog_limit=64 audit: backlog limit exceeded ---------------- Code disassembly (best guess): 0: 00 48 89 add %cl,-0x77(%rax) 3: d8 48 c1 fmuls -0x3f(%rax) 6: e8 03 42 80 3c call 0x3c80420e b: 20 00 and %al,(%rax) d: 74 08 je 0x17 f: 48 89 df mov %rbx,%rdi 12: e8 2f ab 9b fd call 0xfd9bab46 17: 48 8b 1b mov (%rbx),%rbx 1a: 48 83 c3 10 add $0x10,%rbx 1e: 48 89 d8 mov %rbx,%rax 21: 48 c1 e8 03 shr $0x3,%rax 25: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) * 2a: 74 08 je 0x34 <-- trapping instruction 2c: 48 89 df mov %rbx,%rdi 2f: e8 12 ab 9b fd call 0xfd9bab46 34: 48 8b 03 mov (%rbx),%rax 37: 48 89 44 24 40 mov %rax,0x40(%rsp) 3c: 48 rex.W 3d: 8d .byte 0x8d 3e: 98 cwtl 3f: 4c rex.WR