================================ WARNING: inconsistent lock state 6.7.0-rc1-next-20231117-syzkaller #0 Not tainted -------------------------------- inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. syz-executor.4/5318 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff888078125358 (&sighand->siglock){?.+.}-{2:2}, at: __lock_task_sighand+0xc2/0x340 kernel/signal.c:1422 {HARDIRQ-ON-W} state was registered at: lock_acquire kernel/locking/lockdep.c:5753 [inline] lock_acquire+0x1b1/0x530 kernel/locking/lockdep.c:5718 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] class_spinlock_constructor include/linux/spinlock.h:530 [inline] ptrace_set_stopped kernel/ptrace.c:391 [inline] ptrace_attach+0x401/0x650 kernel/ptrace.c:478 __do_sys_ptrace+0x204/0x230 kernel/ptrace.c:1290 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x62/0x6a irq event stamp: 1306 hardirqs last enabled at (1305): [] __call_rcu_common.constprop.0+0x377/0x7a0 kernel/rcu/tree.c:2717 hardirqs last disabled at (1306): [] sysvec_apic_timer_interrupt+0xe/0xb0 arch/x86/kernel/apic/apic.c:1076 softirqs last enabled at (0): [] copy_process+0x244c/0x9770 kernel/fork.c:2466 softirqs last disabled at (0): [<0000000000000000>] 0x0 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&sighand->siglock); lock(&sighand->siglock); *** DEADLOCK *** 4 locks held by syz-executor.4/5318: #0: ffff88807d2abaa0 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:124 [inline] #0: ffff88807d2abaa0 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x15c/0x3c0 mm/util.c:554 #1: ffff88802a770038 (&new_timer->it_lock){-...}-{2:2}, at: posix_timer_fn+0x2d/0x3d0 kernel/time/posix-timers.c:318 #2: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline] #2: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline] #2: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: send_sigqueue+0x10c/0x840 kernel/signal.c:1978 #3: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline] #3: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline] #3: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: __lock_task_sighand+0x3f/0x340 kernel/signal.c:1405 stack backtrace: CPU: 1 PID: 5318 Comm: syz-executor.4 Not tainted 6.7.0-rc1-next-20231117-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_usage_bug kernel/locking/lockdep.c:3970 [inline] valid_state kernel/locking/lockdep.c:4012 [inline] mark_lock_irq kernel/locking/lockdep.c:4215 [inline] mark_lock+0x91a/0xc50 kernel/locking/lockdep.c:4677 mark_usage kernel/locking/lockdep.c:4563 [inline] __lock_acquire+0x1347/0x3b10 kernel/locking/lockdep.c:5090 lock_acquire kernel/locking/lockdep.c:5753 [inline] lock_acquire+0x1b1/0x530 kernel/locking/lockdep.c:5718 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x50 kernel/locking/spinlock.c:162 __lock_task_sighand+0xc2/0x340 kernel/signal.c:1422 lock_task_sighand include/linux/sched/signal.h:748 [inline] send_sigqueue+0x1d4/0x840 kernel/signal.c:1996 posix_timer_event kernel/time/posix-timers.c:298 [inline] posix_timer_fn+0x181/0x3d0 kernel/time/posix-timers.c:324 __run_hrtimer kernel/time/hrtimer.c:1688 [inline] __hrtimer_run_queues+0x20c/0xc20 kernel/time/hrtimer.c:1752 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1814 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1065 [inline] __sysvec_apic_timer_interrupt+0x10c/0x410 arch/x86/kernel/apic/apic.c:1082 sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1076 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:mt_in_rcu include/linux/maple_tree.h:791 [inline] RIP: 0010:mas_mat_destroy lib/maple_tree.c:991 [inline] RIP: 0010:mas_topiary_replace+0x1792/0x3600 lib/maple_tree.c:2645 Code: 60 4c 8b 20 48 b8 00 00 00 00 00 fc ff df 49 8d 7c 24 40 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e 26 17 00 00 <41> 8b 6c 24 40 48 8b 9c 24 a0 00 00 00 83 e5 02 48 85 db 0f 84 c6 RSP: 0018:ffffc9000b0e70d8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffffc9000b0e7288 RCX: ffffffff8a6f5258 RDX: 1ffff1100fa55730 RSI: ffffffff8a6f5267 RDI: ffff88807d2ab980 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000003 R10: 0000000000000003 R11: 0000000000000001 R12: ffff88807d2ab940 R13: 0000000000000003 R14: 0000000000000002 R15: dffffc0000000000 mas_wmb_replace lib/maple_tree.c:2659 [inline] mas_split.isra.0+0xab8/0x11a0 lib/maple_tree.c:3407 mas_commit_b_node.isra.0+0x894/0x14e0 lib/maple_tree.c:3460 mas_wr_bnode+0x187/0x220 lib/maple_tree.c:4175 mas_wr_modify lib/maple_tree.c:4213 [inline] mas_wr_store_entry.isra.0+0x6c4/0x1610 lib/maple_tree.c:4246 mas_store_prealloc+0xb6/0x2a0 lib/maple_tree.c:5444 mmap_region+0xd7c/0x2a90 mm/mmap.c:2887 do_mmap+0x890/0xef0 mm/mmap.c:1379 vm_mmap_pgoff+0x1a7/0x3c0 mm/util.c:556 ksys_mmap_pgoff+0x7d/0x5a0 mm/mmap.c:1425 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:93 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline] __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:86 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x62/0x6a RIP: 0033:0x7f355967cb23 Code: f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 41 89 ca 41 f7 c1 ff 0f 00 00 75 14 b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 25 c3 0f 1f 40 00 48 c7 c0 b0 ff ff ff 64 c7 RSP: 002b:00007fffb283d3e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007f35589ff6c0 RCX: 00007f355967cb23 RDX: 0000000000000000 RSI: 0000000000021000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 00000000ffffffff R09: 0000000000000000 R10: 0000000000020022 R11: 0000000000000246 R12: 00007fffb283d690 R13: ffffffffffffffc0 R14: 0000000000001000 R15: 0000000000000000 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 4c 8b 20 mov (%rax),%r12 3: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax a: fc ff df d: 49 8d 7c 24 40 lea 0x40(%r12),%rdi 12: 48 89 fa mov %rdi,%rdx 15: 48 c1 ea 03 shr $0x3,%rdx 19: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax 1d: 84 c0 test %al,%al 1f: 74 08 je 0x29 21: 3c 03 cmp $0x3,%al 23: 0f 8e 26 17 00 00 jle 0x174f * 29: 41 8b 6c 24 40 mov 0x40(%r12),%ebp <-- trapping instruction 2e: 48 8b 9c 24 a0 00 00 mov 0xa0(%rsp),%rbx 35: 00 36: 83 e5 02 and $0x2,%ebp 39: 48 85 db test %rbx,%rbx 3c: 0f .byte 0xf 3d: 84 c6 test %al,%dh