FAULT_INJECTION: forcing a failure. name fail_usercopy, interval 1, probability 0, space 0, times 0 ====================================================== WARNING: possible circular locking dependency detected 6.1.129-syzkaller #0 Not tainted ------------------------------------------------------ syz.9.457/5985 is trying to acquire lock: ffffffff8d20a538 ((console_sem).lock){-...}-{2:2}, at: down_trylock+0x1c/0xa0 kernel/locking/semaphore.c:139 but task is already holding lock: ffff8880b8e3a9d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:537 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&rq->__lock){-.-.}-{2:2}: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 _raw_spin_lock_nested+0x2d/0x40 kernel/locking/spinlock.c:378 raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:537 raw_spin_rq_lock kernel/sched/sched.h:1355 [inline] rq_lock kernel/sched/sched.h:1645 [inline] task_fork_fair+0x5d/0x350 kernel/sched/fair.c:11886 sched_cgroup_fork+0x374/0x400 kernel/sched/core.c:4684 copy_process+0x2482/0x40a0 kernel/fork.c:2383 kernel_clone+0x222/0x920 kernel/fork.c:2681 user_mode_thread+0x140/0x1b0 kernel/fork.c:2757 rest_init+0x23/0x300 init/main.c:698 start_kernel+0x0/0x53f init/main.c:893 start_kernel+0x496/0x53f init/main.c:1140 secondary_startup_64_no_verify+0xcf/0xdb -> #1 (&p->pi_lock){-.-.}-{2:2}: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __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+0xad/0x1250 kernel/sched/core.c:4110 up+0x6e/0x90 kernel/locking/semaphore.c:191 __up_console_sem+0x11a/0x1e0 kernel/printk/printk.c:260 __console_unlock kernel/printk/printk.c:2697 [inline] console_unlock+0x591/0x7c0 kernel/printk/printk.c:2908 vprintk_emit+0x523/0x740 kernel/printk/printk.c:2303 dev_vprintk_emit+0x334/0x3d9 drivers/base/core.c:4932 dev_printk_emit+0xd9/0x118 drivers/base/core.c:4943 _dev_warn+0x11e/0x165 drivers/base/core.c:4999 firmware_fallback_sysfs+0x674/0x940 drivers/base/firmware_loader/fallback.c:229 _request_firmware+0xcf0/0x12b0 drivers/base/firmware_loader/main.c:884 request_firmware_work_func+0x126/0x270 drivers/base/firmware_loader/main.c:1135 process_one_work+0x917/0x1260 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 -> #0 ((console_sem).lock){-...}-{2:2}: check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __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:139 __down_trylock_console_sem+0x105/0x250 kernel/printk/printk.c:243 console_trylock kernel/printk/printk.c:2650 [inline] console_trylock_spinning kernel/printk/printk.c:1896 [inline] vprintk_emit+0x1ee/0x740 kernel/printk/printk.c:2302 _printk+0xd1/0x111 kernel/printk/printk.c:2328 fail_dump lib/fault-inject.c:45 [inline] should_fail_ex+0x387/0x4d0 lib/fault-inject.c:147 strncpy_from_user+0x32/0x360 lib/strncpy_from_user.c:118 strncpy_from_user_nofault+0x6c/0x130 mm/maccess.c:186 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:204 [inline] ____bpf_probe_read_user_str kernel/trace/bpf_trace.c:213 [inline] bpf_probe_read_user_str+0x26/0x70 kernel/trace/bpf_trace.c:210 bpf_prog_bc7c5c6b9645592f+0x35/0x37 bpf_dispatcher_nop_func include/linux/bpf.h:1000 [inline] __bpf_prog_run include/linux/filter.h:596 [inline] bpf_prog_run include/linux/filter.h:610 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2284 [inline] bpf_trace_run4+0x3c3/0x470 kernel/trace/bpf_trace.c:2325 __traceiter_sched_switch+0x91/0xc0 include/trace/events/sched.h:222 trace_sched_switch include/trace/events/sched.h:222 [inline] __schedule+0x2128/0x4570 kernel/sched/core.c:6557 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6872 irqentry_exit+0x53/0x80 kernel/entry/common.c:439 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 check_region_inline mm/kasan/generic.c:169 [inline] kasan_check_range+0x11/0x290 mm/kasan/generic.c:189 memset+0x1f/0x40 mm/kasan/shadow.c:44 __alloc_skb+0x193/0x2c0 net/core/skbuff.c:529 alloc_skb include/linux/skbuff.h:1271 [inline] netlink_dump+0x24a/0xc80 net/netlink/af_netlink.c:2191 __netlink_dump_start+0x529/0x6d0 net/netlink/af_netlink.c:2320 netlink_dump_start include/linux/netlink.h:269 [inline] packet_diag_handler_dump+0x1e2/0x290 net/packet/diag.c:242 sock_diag_rcv_msg+0x3be/0x5b0 netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2493 sock_diag_rcv+0x26/0x40 net/core/sock_diag.c:295 netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline] netlink_unicast+0x7e2/0x970 net/netlink/af_netlink.c:1337 netlink_sendmsg+0xa26/0xd60 net/netlink/af_netlink.c:1859 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] ____sys_sendmsg+0x5d3/0x9a0 net/socket.c:2519 ___sys_sendmsg net/socket.c:2573 [inline] __sys_sendmsg+0x2a9/0x390 net/socket.c:2602 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 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 *** 4 locks held by syz.9.457/5985: #0: ffffffff8e55a5e8 (sock_diag_mutex){+.+.}-{3:3}, at: sock_diag_rcv+0x17/0x40 net/core/sock_diag.c:294 #1: ffff888061fff690 (nlk_cb_mutex-SOCK_DIAG){+.+.}-{3:3}, at: __netlink_dump_start+0x136/0x6d0 net/netlink/af_netlink.c:2287 #2: ffff8880b8e3a9d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:537 #3: ffffffff8d32e680 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline] #3: ffffffff8d32e680 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline] #3: ffffffff8d32e680 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2283 [inline] #3: ffffffff8d32e680 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run4+0x16a/0x470 kernel/trace/bpf_trace.c:2325 stack backtrace: CPU: 0 PID: 5985 Comm: syz.9.457 Not tainted 6.1.129-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 check_noncircular+0x2fa/0x3b0 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __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:139 __down_trylock_console_sem+0x105/0x250 kernel/printk/printk.c:243 console_trylock kernel/printk/printk.c:2650 [inline] console_trylock_spinning kernel/printk/printk.c:1896 [inline] vprintk_emit+0x1ee/0x740 kernel/printk/printk.c:2302 _printk+0xd1/0x111 kernel/printk/printk.c:2328 fail_dump lib/fault-inject.c:45 [inline] should_fail_ex+0x387/0x4d0 lib/fault-inject.c:147 strncpy_from_user+0x32/0x360 lib/strncpy_from_user.c:118 strncpy_from_user_nofault+0x6c/0x130 mm/maccess.c:186 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:204 [inline] ____bpf_probe_read_user_str kernel/trace/bpf_trace.c:213 [inline] bpf_probe_read_user_str+0x26/0x70 kernel/trace/bpf_trace.c:210 bpf_prog_bc7c5c6b9645592f+0x35/0x37 bpf_dispatcher_nop_func include/linux/bpf.h:1000 [inline] __bpf_prog_run include/linux/filter.h:596 [inline] bpf_prog_run include/linux/filter.h:610 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2284 [inline] bpf_trace_run4+0x3c3/0x470 kernel/trace/bpf_trace.c:2325 __traceiter_sched_switch+0x91/0xc0 include/trace/events/sched.h:222 trace_sched_switch include/trace/events/sched.h:222 [inline] __schedule+0x2128/0x4570 kernel/sched/core.c:6557 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6872 irqentry_exit+0x53/0x80 kernel/entry/common.c:439 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:check_region_inline mm/kasan/generic.c:172 [inline] RIP: 0010:kasan_check_range+0x11/0x290 mm/kasan/generic.c:189 Code: ea ff ff ff c3 0f 0b b8 ea ff ff ff c3 cc cc cc cc cc cc cc cc cc cc cc cc 55 41 57 41 56 53 b0 01 48 85 f6 0f 84 9a 01 00 00 <48> 89 fd 48 01 f5 0f 82 5a 02 00 00 48 89 fd 48 c1 ed 2f 81 fd ff RSP: 0018:ffffc900036473f0 EFLAGS: 00000202 RAX: 0000000000001001 RBX: 00000000000000c8 RCX: ffffffff889e7fd3 RDX: 0000000000000001 RSI: 00000000000000c8 RDI: ffff888059096c80 RBP: ffff888059096c80 R08: 0000000000002000 R09: 0000000000000001 R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000 R13: ffff888059096c80 R14: 0000000000000000 R15: dffffc0000000000 memset+0x1f/0x40 mm/kasan/shadow.c:44 __alloc_skb+0x193/0x2c0 net/core/skbuff.c:529 alloc_skb include/linux/skbuff.h:1271 [inline] netlink_dump+0x24a/0xc80 net/netlink/af_netlink.c:2191 __netlink_dump_start+0x529/0x6d0 net/netlink/af_netlink.c:2320 netlink_dump_start include/linux/netlink.h:269 [inline] packet_diag_handler_dump+0x1e2/0x290 net/packet/diag.c:242 sock_diag_rcv_msg+0x3be/0x5b0 netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2493 sock_diag_rcv+0x26/0x40 net/core/sock_diag.c:295 netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline] netlink_unicast+0x7e2/0x970 net/netlink/af_netlink.c:1337 netlink_sendmsg+0xa26/0xd60 net/netlink/af_netlink.c:1859 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] ____sys_sendmsg+0x5d3/0x9a0 net/socket.c:2519 ___sys_sendmsg net/socket.c:2573 [inline] __sys_sendmsg+0x2a9/0x390 net/socket.c:2602 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fd55218d169 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:00007fd552ff6038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fd5523a5fa0 RCX: 00007fd55218d169 RDX: 0000000000000000 RSI: 0000400000000100 RDI: 0000000000000006 RBP: 00007fd552ff6090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 0000000000000000 R14: 00007fd5523a5fa0 R15: 00007ffcd7b09748 CPU: 0 PID: 5985 Comm: syz.9.457 Not tainted 6.1.129-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 fail_dump lib/fault-inject.c:52 [inline] should_fail_ex+0x3a6/0x4d0 lib/fault-inject.c:147 strncpy_from_user+0x32/0x360 lib/strncpy_from_user.c:118 strncpy_from_user_nofault+0x6c/0x130 mm/maccess.c:186 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:204 [inline] ____bpf_probe_read_user_str kernel/trace/bpf_trace.c:213 [inline] bpf_probe_read_user_str+0x26/0x70 kernel/trace/bpf_trace.c:210 bpf_prog_bc7c5c6b9645592f+0x35/0x37 bpf_dispatcher_nop_func include/linux/bpf.h:1000 [inline] __bpf_prog_run include/linux/filter.h:596 [inline] bpf_prog_run include/linux/filter.h:610 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2284 [inline] bpf_trace_run4+0x3c3/0x470 kernel/trace/bpf_trace.c:2325 __traceiter_sched_switch+0x91/0xc0 include/trace/events/sched.h:222 trace_sched_switch include/trace/events/sched.h:222 [inline] __schedule+0x2128/0x4570 kernel/sched/core.c:6557 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6872 irqentry_exit+0x53/0x80 kernel/entry/common.c:439 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:check_region_inline mm/kasan/generic.c:172 [inline] RIP: 0010:kasan_check_range+0x11/0x290 mm/kasan/generic.c:189 Code: ea ff ff ff c3 0f 0b b8 ea ff ff ff c3 cc cc cc cc cc cc cc cc cc cc cc cc 55 41 57 41 56 53 b0 01 48 85 f6 0f 84 9a 01 00 00 <48> 89 fd 48 01 f5 0f 82 5a 02 00 00 48 89 fd 48 c1 ed 2f 81 fd ff RSP: 0018:ffffc900036473f0 EFLAGS: 00000202 RAX: 0000000000001001 RBX: 00000000000000c8 RCX: ffffffff889e7fd3 RDX: 0000000000000001 RSI: 00000000000000c8 RDI: ffff888059096c80 RBP: ffff888059096c80 R08: 0000000000002000 R09: 0000000000000001 R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000 R13: ffff888059096c80 R14: 0000000000000000 R15: dffffc0000000000 memset+0x1f/0x40 mm/kasan/shadow.c:44 __alloc_skb+0x193/0x2c0 net/core/skbuff.c:529 alloc_skb include/linux/skbuff.h:1271 [inline] netlink_dump+0x24a/0xc80 net/netlink/af_netlink.c:2191 __netlink_dump_start+0x529/0x6d0 net/netlink/af_netlink.c:2320 netlink_dump_start include/linux/netlink.h:269 [inline] packet_diag_handler_dump+0x1e2/0x290 net/packet/diag.c:242 sock_diag_rcv_msg+0x3be/0x5b0 netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2493 sock_diag_rcv+0x26/0x40 net/core/sock_diag.c:295 netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline] netlink_unicast+0x7e2/0x970 net/netlink/af_netlink.c:1337 netlink_sendmsg+0xa26/0xd60 net/netlink/af_netlink.c:1859 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] ____sys_sendmsg+0x5d3/0x9a0 net/socket.c:2519 ___sys_sendmsg net/socket.c:2573 [inline] __sys_sendmsg+0x2a9/0x390 net/socket.c:2602 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fd55218d169 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:00007fd552ff6038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fd5523a5fa0 RCX: 00007fd55218d169 RDX: 0000000000000000 RSI: 0000400000000100 RDI: 0000000000000006 RBP: 00007fd552ff6090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 0000000000000000 R14: 00007fd5523a5fa0 R15: 00007ffcd7b09748 ---------------- Code disassembly (best guess), 3 bytes skipped: 0: ff c3 inc %ebx 2: 0f 0b ud2 4: b8 ea ff ff ff mov $0xffffffea,%eax 9: c3 ret a: cc int3 b: cc int3 c: cc int3 d: cc int3 e: cc int3 f: cc int3 10: cc int3 11: cc int3 12: cc int3 13: cc int3 14: cc int3 15: cc int3 16: 55 push %rbp 17: 41 57 push %r15 19: 41 56 push %r14 1b: 53 push %rbx 1c: b0 01 mov $0x1,%al 1e: 48 85 f6 test %rsi,%rsi 21: 0f 84 9a 01 00 00 je 0x1c1 * 27: 48 89 fd mov %rdi,%rbp <-- trapping instruction 2a: 48 01 f5 add %rsi,%rbp 2d: 0f 82 5a 02 00 00 jb 0x28d 33: 48 89 fd mov %rdi,%rbp 36: 48 c1 ed 2f shr $0x2f,%rbp 3a: 81 .byte 0x81 3b: fd std 3c: ff .byte 0xff