FAULT_INJECTION: forcing a failure. name fail_usercopy, interval 1, probability 0, space 0, times 1 ====================================================== WARNING: possible circular locking dependency detected 5.15.178-syzkaller #0 Not tainted ------------------------------------------------------ syz.0.81/4627 is trying to acquire lock: ffffffff8c9fc538 ((console_sem).lock){....}-{2:2}, at: down_trylock+0x1c/0xa0 kernel/locking/semaphore.c:138 but task is already holding lock: ffff8880b8e3a318 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:475 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&rq->__lock){-.-.}-{2:2}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 _raw_spin_lock_nested+0x2d/0x40 kernel/locking/spinlock.c:368 raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:475 raw_spin_rq_lock kernel/sched/sched.h:1326 [inline] rq_lock kernel/sched/sched.h:1621 [inline] task_fork_fair+0x5d/0x350 kernel/sched/fair.c:11488 sched_cgroup_fork+0x2d3/0x330 kernel/sched/core.c:4463 copy_process+0x224a/0x3ef0 kernel/fork.c:2319 kernel_clone+0x210/0x960 kernel/fork.c:2603 kernel_thread+0x168/0x1e0 kernel/fork.c:2655 rest_init+0x21/0x330 init/main.c:706 start_kernel+0x48c/0x540 init/main.c:1140 secondary_startup_64_no_verify+0xb1/0xbb -> #1 (&p->pi_lock){-.-.}-{2:2}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162 try_to_wake_up+0xae/0x1300 kernel/sched/core.c:4027 up+0x6e/0x90 kernel/locking/semaphore.c:190 __up_console_sem+0x11a/0x1e0 kernel/printk/printk.c:256 console_unlock+0x1145/0x12b0 kernel/printk/printk.c:2760 vprintk_emit+0xbf/0x150 kernel/printk/printk.c:2274 dev_vprintk_emit+0x2aa/0x330 drivers/base/core.c:4638 dev_printk_emit+0xd9/0x120 drivers/base/core.c:4649 _dev_warn+0x11e/0x170 drivers/base/core.c:4705 firmware_fallback_sysfs+0x681/0xc90 drivers/base/firmware_loader/fallback.c:654 _request_firmware+0xc72/0x12c0 drivers/base/firmware_loader/main.c:876 request_firmware_work_func+0x126/0x270 drivers/base/firmware_loader/main.c:1127 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457 kthread+0x3f6/0x4f0 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 -> #0 ((console_sem).lock){....}-{2:2}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162 down_trylock+0x1c/0xa0 kernel/locking/semaphore.c:138 __down_trylock_console_sem+0x105/0x250 kernel/printk/printk.c:239 console_trylock kernel/printk/printk.c:2575 [inline] console_trylock_spinning+0x8a/0x3f0 kernel/printk/printk.c:1867 vprintk_emit+0xa6/0x150 kernel/printk/printk.c:2273 _printk+0xd1/0x120 kernel/printk/printk.c:2299 fail_dump lib/fault-inject.c:45 [inline] should_fail+0x36c/0x4c0 lib/fault-inject.c:146 strncpy_from_user+0x32/0x370 lib/strncpy_from_user.c:118 strncpy_from_user_nofault+0x6c/0x130 mm/maccess.c:295 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:194 [inline] ____bpf_probe_read_compat_str kernel/trace/bpf_trace.c:300 [inline] bpf_probe_read_compat_str+0xe4/0x180 kernel/trace/bpf_trace.c:296 bpf_prog_c1796171ffc7efef+0x35/0xe44 bpf_dispatcher_nop_func include/linux/bpf.h:790 [inline] __bpf_prog_run include/linux/filter.h:628 [inline] bpf_prog_run include/linux/filter.h:635 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:1878 [inline] bpf_trace_run3+0x1d1/0x380 kernel/trace/bpf_trace.c:1916 trace_sched_switch include/trace/events/sched.h:220 [inline] __schedule+0x1e8d/0x45b0 kernel/sched/core.c:6370 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6777 irqentry_exit+0x53/0x80 kernel/entry/common.c:432 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 lock_acquire+0x18/0x4f0 kernel/locking/lockdep.c:5591 __fs_reclaim_acquire mm/page_alloc.c:4580 [inline] fs_reclaim_acquire+0x83/0x120 mm/page_alloc.c:4594 might_alloc include/linux/sched/mm.h:206 [inline] slab_pre_alloc_hook+0x22/0xc0 mm/slab.h:492 slab_alloc_node mm/slub.c:3134 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc+0x3f/0x280 mm/slub.c:3233 getname_flags+0xb8/0x4e0 fs/namei.c:138 do_sys_openat2+0xd2/0x4f0 fs/open.c:1247 do_sys_open fs/open.c:1269 [inline] __do_sys_open fs/open.c:1277 [inline] __se_sys_open fs/open.c:1273 [inline] __x64_sys_open+0x221/0x270 fs/open.c:1273 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 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.0.81/4627: #0: ffff8880b8e3a318 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:475 #1: ffffffff8cb1fce0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:311 stack backtrace: CPU: 0 PID: 4627 Comm: syz.0.81 Not tainted 5.15.178-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 check_noncircular+0x2f8/0x3b0 kernel/locking/lockdep.c:2133 check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162 down_trylock+0x1c/0xa0 kernel/locking/semaphore.c:138 __down_trylock_console_sem+0x105/0x250 kernel/printk/printk.c:239 console_trylock kernel/printk/printk.c:2575 [inline] console_trylock_spinning+0x8a/0x3f0 kernel/printk/printk.c:1867 vprintk_emit+0xa6/0x150 kernel/printk/printk.c:2273 _printk+0xd1/0x120 kernel/printk/printk.c:2299 fail_dump lib/fault-inject.c:45 [inline] should_fail+0x36c/0x4c0 lib/fault-inject.c:146 strncpy_from_user+0x32/0x370 lib/strncpy_from_user.c:118 strncpy_from_user_nofault+0x6c/0x130 mm/maccess.c:295 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:194 [inline] ____bpf_probe_read_compat_str kernel/trace/bpf_trace.c:300 [inline] bpf_probe_read_compat_str+0xe4/0x180 kernel/trace/bpf_trace.c:296 bpf_prog_c1796171ffc7efef+0x35/0xe44 bpf_dispatcher_nop_func include/linux/bpf.h:790 [inline] __bpf_prog_run include/linux/filter.h:628 [inline] bpf_prog_run include/linux/filter.h:635 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:1878 [inline] bpf_trace_run3+0x1d1/0x380 kernel/trace/bpf_trace.c:1916 trace_sched_switch include/trace/events/sched.h:220 [inline] __schedule+0x1e8d/0x45b0 kernel/sched/core.c:6370 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6777 irqentry_exit+0x53/0x80 kernel/entry/common.c:432 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:lock_acquire+0x18/0x4f0 kernel/locking/lockdep.c:5591 Code: 00 00 65 8b 05 b1 a2 9f 7e a9 00 ff ff 00 0f 95 c0 c3 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 81 ec 20 01 00 00 <4c> 89 4c 24 28 4c 89 44 24 38 48 89 4c 24 30 89 54 24 1c 41 89 f6 RSP: 0018:ffffc900032cfae0 EFLAGS: 00000282 RAX: 0000000000000000 RBX: ffff888023b99dec RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8cbe0ac0 RBP: ffffc900032cfc30 R08: 0000000000000001 R09: 0000000000000000 R10: ffffffffffffffff R11: dffffc0000000001 R12: ffff8880175ea500 R13: 00000000ffffff9c R14: ffffc900032cfc98 R15: 0000000000000001 __fs_reclaim_acquire mm/page_alloc.c:4580 [inline] fs_reclaim_acquire+0x83/0x120 mm/page_alloc.c:4594 might_alloc include/linux/sched/mm.h:206 [inline] slab_pre_alloc_hook+0x22/0xc0 mm/slab.h:492 slab_alloc_node mm/slub.c:3134 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc+0x3f/0x280 mm/slub.c:3233 getname_flags+0xb8/0x4e0 fs/namei.c:138 do_sys_openat2+0xd2/0x4f0 fs/open.c:1247 do_sys_open fs/open.c:1269 [inline] __do_sys_open fs/open.c:1277 [inline] __se_sys_open fs/open.c:1273 [inline] __x64_sys_open+0x221/0x270 fs/open.c:1273 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fd939dd0169 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:00007fd938fff038 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007fd939fe9160 RCX: 00007fd939dd0169 RDX: 0000000000000000 RSI: 0000000000145142 RDI: 0000400000000240 RBP: 00007fd938fff090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 00007fd939fe9160 R15: 00007ffc7912b5e8 CPU: 0 PID: 4627 Comm: syz.0.81 Not tainted 5.15.178-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 fail_dump lib/fault-inject.c:52 [inline] should_fail+0x38a/0x4c0 lib/fault-inject.c:146 strncpy_from_user+0x32/0x370 lib/strncpy_from_user.c:118 strncpy_from_user_nofault+0x6c/0x130 mm/maccess.c:295 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:194 [inline] ____bpf_probe_read_compat_str kernel/trace/bpf_trace.c:300 [inline] bpf_probe_read_compat_str+0xe4/0x180 kernel/trace/bpf_trace.c:296 bpf_prog_c1796171ffc7efef+0x35/0xe44 bpf_dispatcher_nop_func include/linux/bpf.h:790 [inline] __bpf_prog_run include/linux/filter.h:628 [inline] bpf_prog_run include/linux/filter.h:635 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:1878 [inline] bpf_trace_run3+0x1d1/0x380 kernel/trace/bpf_trace.c:1916 trace_sched_switch include/trace/events/sched.h:220 [inline] __schedule+0x1e8d/0x45b0 kernel/sched/core.c:6370 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6777 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 65 8b 05 b1 a2 9f 7e mov %gs:0x7e9fa2b1(%rip),%eax # 0x7e9fa2ba 9: a9 00 ff ff 00 test $0xffff00,%eax e: 0f 95 c0 setne %al 11: c3 ret 12: 55 push %rbp 13: 48 89 e5 mov %rsp,%rbp 16: 41 57 push %r15 18: 41 56 push %r14 1a: 41 55 push %r13 1c: 41 54 push %r12 1e: 53 push %rbx 1f: 48 83 e4 e0 and $0xffffffffffffffe0,%rsp 23: 48 81 ec 20 01 00 00 sub $0x120,%rsp * 2a: 4c 89 4c 24 28 mov %r9,0x28(%rsp) <-- trapping instruction 2f: 4c 89 44 24 38 mov %r8,0x38(%rsp) 34: 48 89 4c 24 30 mov %rcx,0x30(%rsp) 39: 89 54 24 1c mov %edx,0x1c(%rsp) 3d: 41 89 f6 mov %esi,%r14d