loop4: detected capacity change from 0 to 16 erofs: (device loop4): mounted with root inode @ nid 36. 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-rc5-syzkaller-00050-g3ec3f5fc4a91 #0 Not tainted ------------------------------------------------------ syz.4.1093/14543 is trying to acquire lock: ffffffff8e813cb8 ((console_sem).lock){-.-.}-{2:2}, at: down_trylock+0x20/0xa0 kernel/locking/semaphore.c:139 but task is already holding lock: ffff8880b933e9d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:560 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+0x37e/0x410 kernel/sched/core.c:4633 copy_process+0x2217/0x3dc0 kernel/fork.c:2483 kernel_clone+0x226/0x8f0 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:2801 [inline] console_unlock+0x22f/0x4d0 kernel/printk/printk.c:3120 vprintk_emit+0x5dc/0x7c0 kernel/printk/printk.c:2348 _printk+0xd5/0x120 kernel/printk/printk.c:2373 batadv_check_known_mac_addr+0x2bd/0x410 net/batman-adv/hard-interface.c:528 batadv_hard_if_event+0x3a5/0x1620 net/batman-adv/hard-interface.c:998 notifier_call_chain+0x1a1/0x3e0 kernel/notifier.c:93 call_netdevice_notifiers_extack net/core/dev.c:2032 [inline] call_netdevice_notifiers net/core/dev.c:2046 [inline] dev_set_mac_address+0x3d9/0x510 net/core/dev.c:9101 dev_set_mac_address_user+0x31/0x50 net/core/dev.c:9115 do_setlink+0x8b6/0x41f0 net/core/rtnetlink.c:2855 __rtnl_newlink net/core/rtnetlink.c:3696 [inline] rtnl_newlink+0x180d/0x20a0 net/core/rtnetlink.c:3743 rtnetlink_rcv_msg+0x741/0xcf0 net/core/rtnetlink.c:6647 netlink_rcv_skb+0x1e5/0x430 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline] netlink_unicast+0x7f8/0x990 net/netlink/af_netlink.c:1357 netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1901 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x223/0x270 net/socket.c:745 __sys_sendto+0x3a4/0x4f0 net/socket.c:2204 __do_sys_sendto net/socket.c:2216 [inline] __se_sys_sendto net/socket.c:2212 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2212 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:2754 [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/0x43 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+0x336/0x590 kernel/trace/bpf_trace.c:2449 __traceiter_sched_switch+0x9a/0xd0 include/trace/events/sched.h:222 trace_sched_switch include/trace/events/sched.h:222 [inline] __schedule+0x2591/0x4a60 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 stack_trace_consume_entry+0x117/0x280 kernel/stacktrace.c:94 arch_stack_walk+0x145/0x1b0 arch/x86/kernel/stacktrace.c:27 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:4158 [inline] __kmalloc_node_track_caller_noprof+0x225/0x440 mm/slub.c:4177 memdup_user+0x2b/0xc0 mm/util.c:226 strndup_user+0x68/0xc0 mm/util.c:285 copy_mount_string fs/namespace.c:3707 [inline] __do_sys_mount fs/namespace.c:4005 [inline] __se_sys_mount+0x9f/0x3c0 fs/namespace.c:3997 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.4.1093/14543: #0: ffff8880b933e9d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:560 #1: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline] #1: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline] #1: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2405 [inline] #1: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run4+0x244/0x590 kernel/trace/bpf_trace.c:2449 stack backtrace: CPU: 1 UID: 0 PID: 14543 Comm: syz.4.1093 Not tainted 6.11.0-rc5-syzkaller-00050-g3ec3f5fc4a91 #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:2754 [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/0x43 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+0x336/0x590 kernel/trace/bpf_trace.c:2449 __traceiter_sched_switch+0x9a/0xd0 include/trace/events/sched.h:222 trace_sched_switch include/trace/events/sched.h:222 [inline] __schedule+0x2591/0x4a60 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:stack_trace_consume_entry+0x117/0x280 kernel/stacktrace.c:94 Code: 48 c1 e8 03 80 3c 10 00 74 1a 4d 89 cf 48 89 df 49 89 d6 49 89 f5 e8 e8 9f 7b 00 4d 89 f9 4c 89 ee 4c 89 f2 48 89 33 41 8b 19 <41> 0f b6 04 14 84 c0 0f 85 34 01 00 00 3b 5d 00 0f 92 c0 48 83 c4 RSP: 0018:ffffc9000315f950 EFLAGS: 00000246 RAX: 1ffff9200062bf65 RBX: 0000000000000002 RCX: ffff888027869e00 RDX: dffffc0000000000 RSI: ffffffff81fa9b88 RDI: ffffc9000315fa8c RBP: ffffc9000315fa88 R08: 0000000000000001 R09: ffffc9000315fa90 R10: 0000000000000003 R11: ffffffff817f2f00 R12: 1ffff9200062bf51 R13: 1ffff9200062bf51 R14: 0000000000000002 R15: 1ffff9200062bf52 arch_stack_walk+0x145/0x1b0 arch/x86/kernel/stacktrace.c:27 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:4158 [inline] __kmalloc_node_track_caller_noprof+0x225/0x440 mm/slub.c:4177 memdup_user+0x2b/0xc0 mm/util.c:226 strndup_user+0x68/0xc0 mm/util.c:285 copy_mount_string fs/namespace.c:3707 [inline] __do_sys_mount fs/namespace.c:4005 [inline] __se_sys_mount+0x9f/0x3c0 fs/namespace.c:3997 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: 0033:0x7fd0bd179e79 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:00007fd0bcbbd038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fd0bd316130 RCX: 00007fd0bd179e79 RDX: 0000000020000080 RSI: 0000000020000300 RDI: 0000000000000000 RBP: 00007fd0bcbbd090 R08: 0000000020000480 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 00007fd0bd316130 R15: 00007ffd3a432198 CPU: 1 UID: 0 PID: 14543 Comm: syz.4.1093 Not tainted 6.11.0-rc5-syzkaller-00050-g3ec3f5fc4a91 #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/0x43 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+0x336/0x590 kernel/trace/bpf_trace.c:2449 __traceiter_sched_switch+0x9a/0xd0 include/trace/events/sched.h:222 trace_sched_switch include/trace/events/sched.h:222 [inline] __schedule+0x2591/0x4a60 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:stack_trace_consume_entry+0x117/0x280 kernel/stacktrace.c:94 Code: 48 c1 e8 03 80 3c 10 00 74 1a 4d 89 cf 48 89 df 49 89 d6 49 89 f5 e8 e8 9f 7b 00 4d 89 f9 4c 89 ee 4c 89 f2 48 89 33 41 8b 19 <41> 0f b6 04 14 84 c0 0f 85 34 01 00 00 3b 5d 00 0f 92 c0 48 83 c4 RSP: 0018:ffffc9000315f950 EFLAGS: 00000246 RAX: 1ffff9200062bf65 RBX: 0000000000000002 RCX: ffff888027869e00 RDX: dffffc0000000000 RSI: ffffffff81fa9b88 RDI: ffffc9000315fa8c RBP: ffffc9000315fa88 R08: 0000000000000001 R09: ffffc9000315fa90 R10: 0000000000000003 R11: ffffffff817f2f00 R12: 1ffff9200062bf51 R13: 1ffff9200062bf51 R14: 0000000000000002 R15: 1ffff9200062bf52 arch_stack_walk+0x145/0x1b0 arch/x86/kernel/stacktrace.c:27 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:4158 [inline] __kmalloc_node_track_caller_noprof+0x225/0x440 mm/slub.c:4177 memdup_user+0x2b/0xc0 mm/util.c:226 strndup_user+0x68/0xc0 mm/util.c:285 copy_mount_string fs/namespace.c:3707 [inline] __do_sys_mount fs/namespace.c:4005 [inline] __se_sys_mount+0x9f/0x3c0 fs/namespace.c:3997 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: 0033:0x7fd0bd179e79 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:00007fd0bcbbd038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fd0bd316130 RCX: 00007fd0bd179e79 RDX: 0000000020000080 RSI: 0000000020000300 RDI: 0000000000000000 RBP: 00007fd0bcbbd090 R08: 0000000020000480 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 00007fd0bd316130 R15: 00007ffd3a432198 erofs: (device loop4): z_erofs_fill_inode_lazy: invalid tail-packing pclustersize 0 erofs: (device loop4): z_erofs_fill_inode_lazy: invalid tail-packing pclustersize 0 erofs: (device loop4): z_erofs_read_folio: read error -117 @ 8200 of nid 36 ---------------- Code disassembly (best guess): 0: 48 c1 e8 03 shr $0x3,%rax 4: 80 3c 10 00 cmpb $0x0,(%rax,%rdx,1) 8: 74 1a je 0x24 a: 4d 89 cf mov %r9,%r15 d: 48 89 df mov %rbx,%rdi 10: 49 89 d6 mov %rdx,%r14 13: 49 89 f5 mov %rsi,%r13 16: e8 e8 9f 7b 00 call 0x7ba003 1b: 4d 89 f9 mov %r15,%r9 1e: 4c 89 ee mov %r13,%rsi 21: 4c 89 f2 mov %r14,%rdx 24: 48 89 33 mov %rsi,(%rbx) 27: 41 8b 19 mov (%r9),%ebx * 2a: 41 0f b6 04 14 movzbl (%r12,%rdx,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 34 01 00 00 jne 0x16b 37: 3b 5d 00 cmp 0x0(%rbp),%ebx 3a: 0f 92 c0 setb %al 3d: 48 rex.W 3e: 83 .byte 0x83 3f: c4 .byte 0xc4