================================ WARNING: inconsistent lock state 6.7.0-rc1-next-20231117-syzkaller #0 Not tainted -------------------------------- inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. syz-executor.3/5092 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff88808036ca18 (&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: 1087006 hardirqs last enabled at (1087005): [] mod_lruvec_page_state include/linux/vmstat.h:569 [inline] hardirqs last enabled at (1087005): [] lruvec_stat_mod_folio include/linux/vmstat.h:645 [inline] hardirqs last enabled at (1087005): [] lruvec_stat_add_folio include/linux/vmstat.h:651 [inline] hardirqs last enabled at (1087005): [] pagetable_pte_ctor include/linux/mm.h:2931 [inline] hardirqs last enabled at (1087005): [] __pte_alloc_one include/asm-generic/pgalloc.h:71 [inline] hardirqs last enabled at (1087005): [] pte_alloc_one+0x2a9/0x370 arch/x86/mm/pgtable.c:33 hardirqs last disabled at (1087006): [] sysvec_apic_timer_interrupt+0xe/0xb0 arch/x86/kernel/apic/apic.c:1076 softirqs last enabled at (1086952): [] softirq_handle_end kernel/softirq.c:399 [inline] softirqs last enabled at (1086952): [] __do_softirq+0x591/0x8d5 kernel/softirq.c:582 softirqs last disabled at (1086785): [] invoke_softirq kernel/softirq.c:427 [inline] softirqs last disabled at (1086785): [] __irq_exit_rcu kernel/softirq.c:632 [inline] softirqs last disabled at (1086785): [] irq_exit_rcu+0xb5/0x120 kernel/softirq.c:644 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&sighand->siglock); lock(&sighand->siglock); *** DEADLOCK *** 11 locks held by syz-executor.3/5092: #0: ffffffff8d0af1b0 (dup_mmap_sem){.+.+}-{0:0}, at: dup_mmap kernel/fork.c:655 [inline] #0: ffffffff8d0af1b0 (dup_mmap_sem){.+.+}-{0:0}, at: dup_mm kernel/fork.c:1709 [inline] #0: ffffffff8d0af1b0 (dup_mmap_sem){.+.+}-{0:0}, at: copy_mm kernel/fork.c:1758 [inline] #0: ffffffff8d0af1b0 (dup_mmap_sem){.+.+}-{0:0}, at: copy_process+0x42a6/0x9770 kernel/fork.c:2520 #1: ffff888025898b20 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:124 [inline] #1: ffff888025898b20 (&mm->mmap_lock){++++}-{3:3}, at: dup_mmap kernel/fork.c:656 [inline] #1: ffff888025898b20 (&mm->mmap_lock){++++}-{3:3}, at: dup_mm kernel/fork.c:1709 [inline] #1: ffff888025898b20 (&mm->mmap_lock){++++}-{3:3}, at: copy_mm kernel/fork.c:1758 [inline] #1: ffff888025898b20 (&mm->mmap_lock){++++}-{3:3}, at: copy_process+0x42cc/0x9770 kernel/fork.c:2520 #2: ffff8880258994a0 (&mm->mmap_lock/1){+.+.}-{3:3}, at: mmap_write_lock_nested include/linux/mmap_lock.h:115 [inline] #2: ffff8880258994a0 (&mm->mmap_lock/1){+.+.}-{3:3}, at: dup_mmap kernel/fork.c:665 [inline] #2: ffff8880258994a0 (&mm->mmap_lock/1){+.+.}-{3:3}, at: dup_mm kernel/fork.c:1709 [inline] #2: ffff8880258994a0 (&mm->mmap_lock/1){+.+.}-{3:3}, at: copy_mm kernel/fork.c:1758 [inline] #2: ffff8880258994a0 (&mm->mmap_lock/1){+.+.}-{3:3}, at: copy_process+0x432c/0x9770 kernel/fork.c:2520 #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: __pte_offset_map+0x42/0x540 mm/pgtable-generic.c:285 #4: ffff88801d2bc438 (ptlock_ptr(ptdesc)#2){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] #4: ffff88801d2bc438 (ptlock_ptr(ptdesc)#2){+.+.}-{2:2}, at: __pte_offset_map_lock+0xf1/0x2f0 mm/pgtable-generic.c:373 #5: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline] #5: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline] #5: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: __pte_offset_map+0x42/0x540 mm/pgtable-generic.c:285 #6: ffff88807c8ec018 (ptlock_ptr(ptdesc)#2/1){+.+.}-{2:2}, at: copy_pte_range mm/memory.c:1052 [inline] #6: ffff88807c8ec018 (ptlock_ptr(ptdesc)#2/1){+.+.}-{2:2}, at: copy_pmd_range mm/memory.c:1180 [inline] #6: ffff88807c8ec018 (ptlock_ptr(ptdesc)#2/1){+.+.}-{2:2}, at: copy_pud_range mm/memory.c:1217 [inline] #6: ffff88807c8ec018 (ptlock_ptr(ptdesc)#2/1){+.+.}-{2:2}, at: copy_p4d_range mm/memory.c:1241 [inline] #6: ffff88807c8ec018 (ptlock_ptr(ptdesc)#2/1){+.+.}-{2:2}, at: copy_page_range+0xd1c/0x3c40 mm/memory.c:1339 #7: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline] #7: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline] #7: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: page_ext_get+0x34/0x310 mm/page_ext.c:508 #8: ffff8880720b4038 (&new_timer->it_lock){-...}-{2:2}, at: posix_timer_fn+0x2d/0x3d0 kernel/time/posix-timers.c:318 #9: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline] #9: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline] #9: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: send_sigqueue+0x10c/0x840 kernel/signal.c:1978 #10: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline] #10: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline] #10: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: __lock_task_sighand+0x3f/0x340 kernel/signal.c:1405 stack backtrace: CPU: 1 PID: 5092 Comm: syz-executor.3 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:__sanitizer_cov_trace_const_cmp1+0x0/0x20 kernel/kcov.c:289 Code: 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 48 8b 0c 24 48 89 f2 48 89 fe bf 06 00 00 00 e9 08 ff ff ff 0f 1f 84 00 00 00 00 00 0f 1e fa 48 8b 0c 24 40 0f b6 d6 40 0f b6 f7 bf 01 00 00 00 e9 RSP: 0018:ffffc900040df6d8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000048 RCX: ffffffff81e97a97 RDX: ffff888020f19dc0 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000007 R12: ffff888014c2b660 R13: 0000000000000001 R14: 0000000000000000 R15: dffffc0000000000 page_table_check_set.part.0+0x214/0x7f0 mm/page_table_check.c:117 page_table_check_set mm/page_table_check.c:196 [inline] __page_table_check_ptes_set+0x5e3/0xb70 mm/page_table_check.c:196 page_table_check_ptes_set include/linux/page_table_check.h:74 [inline] set_ptes include/linux/pgtable.h:234 [inline] copy_present_pte mm/memory.c:991 [inline] copy_pte_range mm/memory.c:1095 [inline] copy_pmd_range mm/memory.c:1180 [inline] copy_pud_range mm/memory.c:1217 [inline] copy_p4d_range mm/memory.c:1241 [inline] copy_page_range+0x1523/0x3c40 mm/memory.c:1339 dup_mmap kernel/fork.c:765 [inline] dup_mm kernel/fork.c:1709 [inline] copy_mm kernel/fork.c:1758 [inline] copy_process+0x5c30/0x9770 kernel/fork.c:2520 kernel_clone+0xfd/0x940 kernel/fork.c:2925 __do_sys_clone+0xba/0x100 kernel/fork.c:3068 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: 0033:0x7febebc79b13 Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00 RSP: 002b:00007ffe318619b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007febebc79b13 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 000055555738a750 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000001 ---------------- Code disassembly (best guess): 0: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) 7: 00 00 00 a: f3 0f 1e fa endbr64 e: 48 8b 0c 24 mov (%rsp),%rcx 12: 48 89 f2 mov %rsi,%rdx 15: 48 89 fe mov %rdi,%rsi 18: bf 06 00 00 00 mov $0x6,%edi 1d: e9 08 ff ff ff jmp 0xffffff2a 22: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1) 29: 00 * 2a: f3 0f 1e fa endbr64 <-- trapping instruction 2e: 48 8b 0c 24 mov (%rsp),%rcx 32: 40 0f b6 d6 movzbl %sil,%edx 36: 40 0f b6 f7 movzbl %dil,%esi 3a: bf 01 00 00 00 mov $0x1,%edi 3f: e9 .byte 0xe9