======================================================== WARNING: possible irq lock inversion dependency detected 6.7.0-rc1-next-20231117-syzkaller #0 Not tainted -------------------------------------------------------- syz-executor.2/11864 just changed the state of lock: ffff88802890e618 (&new_timer->it_lock){-...}-{2:2}, at: posix_timer_fn+0x2d/0x3d0 kernel/time/posix-timers.c:318 but this lock took another, HARDIRQ-unsafe lock in the past: (&sighand->siglock){+.+.}-{2:2} and interrupts could create inverse lock ordering between them. other info that might help us debug this: Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sighand->siglock); local_irq_disable(); lock(&new_timer->it_lock); lock(&sighand->siglock); lock(&new_timer->it_lock); *** DEADLOCK *** 1 lock held by syz-executor.2/11864: #0: ffff88802b0d14a0 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock include/linux/mmap_lock.h:108 [inline] #0: ffff88802b0d14a0 (&mm->mmap_lock){++++}-{3:3}, at: exit_mmap+0x203/0xb60 mm/mmap.c:3282 the shortest dependencies between 2nd lock and 1st lock: -> (&sighand->siglock){+.+.}-{2:2} { HARDIRQ-ON-W 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 SOFTIRQ-ON-W 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 INITIAL USE at: lock_acquire kernel/locking/lockdep.c:5753 [inline] lock_acquire+0x1b1/0x530 kernel/locking/lockdep.c:5718 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline] _raw_spin_lock_irq+0x36/0x50 kernel/locking/spinlock.c:170 spin_lock_irq include/linux/spinlock.h:376 [inline] calculate_sigpending+0x44/0xa0 kernel/signal.c:197 ret_from_fork+0x23/0x80 arch/x86/kernel/process.c:143 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 } ... key at: [] __key.341+0x0/0x40 ... acquired at: __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] __do_sys_timer_delete kernel/time/posix-timers.c:1023 [inline] __se_sys_timer_delete kernel/time/posix-timers.c:1006 [inline] __x64_sys_timer_delete+0x16a/0x3e0 kernel/time/posix-timers.c:1006 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 -> (&new_timer->it_lock){-...}-{2:2} { IN-HARDIRQ-W at: 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 posix_timer_fn+0x2d/0x3d0 kernel/time/posix-timers.c:318 __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 __sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:527 unwind_next_frame+0x331/0x2390 arch/x86/kernel/unwind_orc.c:495 arch_stack_walk+0xfa/0x170 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122 kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x24/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:522 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x15b/0x1b0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:164 [inline] slab_free_hook mm/slub.c:1809 [inline] slab_free_freelist_hook+0x114/0x1e0 mm/slub.c:1835 slab_free mm/slub.c:3784 [inline] kmem_cache_free+0xfd/0x360 mm/slub.c:3806 pmd_ptlock_free include/linux/mm.h:3013 [inline] pagetable_pmd_dtor include/linux/mm.h:3054 [inline] ___pmd_free_tlb+0x74/0x2e0 arch/x86/mm/pgtable.c:72 __pmd_free_tlb arch/x86/include/asm/pgalloc.h:93 [inline] free_pmd_range mm/memory.c:228 [inline] free_pud_range mm/memory.c:246 [inline] free_p4d_range mm/memory.c:280 [inline] free_pgd_range+0x997/0xb80 mm/memory.c:360 free_pgtables+0x672/0x860 mm/memory.c:407 exit_mmap+0x3d2/0xb60 mm/mmap.c:3285 __mmput+0x12a/0x4d0 kernel/fork.c:1367 mmput+0x62/0x70 kernel/fork.c:1389 exit_mm kernel/exit.c:567 [inline] do_exit+0x9a1/0x2ad0 kernel/exit.c:858 do_group_exit+0xd3/0x2a0 kernel/exit.c:1021 get_signal+0x2395/0x2770 kernel/signal.c:2902 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:309 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11e/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1e/0x60 kernel/entry/common.c:296 do_syscall_64+0x4d/0x110 arch/x86/entry/common.c:88 entry_SYSCALL_64_after_hwframe+0x62/0x6a INITIAL USE at: 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_timer+0x20d/0x4c0 kernel/time/posix-timers.c:595 __do_sys_timer_delete kernel/time/posix-timers.c:1011 [inline] __se_sys_timer_delete kernel/time/posix-timers.c:1006 [inline] __x64_sys_timer_delete+0x9e/0x3e0 kernel/time/posix-timers.c:1006 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 } ... key at: [] __key.0+0x0/0x40 ... acquired at: 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 posix_timer_fn+0x2d/0x3d0 kernel/time/posix-timers.c:318 __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 __sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:527 unwind_next_frame+0x331/0x2390 arch/x86/kernel/unwind_orc.c:495 arch_stack_walk+0xfa/0x170 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122 kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x24/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:522 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x15b/0x1b0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:164 [inline] slab_free_hook mm/slub.c:1809 [inline] slab_free_freelist_hook+0x114/0x1e0 mm/slub.c:1835 slab_free mm/slub.c:3784 [inline] kmem_cache_free+0xfd/0x360 mm/slub.c:3806 pmd_ptlock_free include/linux/mm.h:3013 [inline] pagetable_pmd_dtor include/linux/mm.h:3054 [inline] ___pmd_free_tlb+0x74/0x2e0 arch/x86/mm/pgtable.c:72 __pmd_free_tlb arch/x86/include/asm/pgalloc.h:93 [inline] free_pmd_range mm/memory.c:228 [inline] free_pud_range mm/memory.c:246 [inline] free_p4d_range mm/memory.c:280 [inline] free_pgd_range+0x997/0xb80 mm/memory.c:360 free_pgtables+0x672/0x860 mm/memory.c:407 exit_mmap+0x3d2/0xb60 mm/mmap.c:3285 __mmput+0x12a/0x4d0 kernel/fork.c:1367 mmput+0x62/0x70 kernel/fork.c:1389 exit_mm kernel/exit.c:567 [inline] do_exit+0x9a1/0x2ad0 kernel/exit.c:858 do_group_exit+0xd3/0x2a0 kernel/exit.c:1021 get_signal+0x2395/0x2770 kernel/signal.c:2902 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:309 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11e/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1e/0x60 kernel/entry/common.c:296 do_syscall_64+0x4d/0x110 arch/x86/entry/common.c:88 entry_SYSCALL_64_after_hwframe+0x62/0x6a stack backtrace: CPU: 1 PID: 11864 Comm: syz-executor.2 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_irq_inversion_bug.part.0+0x3e1/0x590 kernel/locking/lockdep.c:4079 print_irq_inversion_bug kernel/locking/lockdep.c:4032 [inline] check_usage_forwards kernel/locking/lockdep.c:4110 [inline] mark_lock_irq kernel/locking/lockdep.c:4242 [inline] mark_lock+0x570/0xc50 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 posix_timer_fn+0x2d/0x3d0 kernel/time/posix-timers.c:318 __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_pc+0x0/0x60 kernel/kcov.c:200 Code: 66 af da 02 66 0f 1f 44 00 00 f3 0f 1e fa 48 8b be b0 01 00 00 e8 b0 ff ff ff 31 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 0f 1e fa 65 48 8b 15 a4 ad 7b 7e 65 8b 05 a5 ad 7b 7e a9 00 01 RSP: 0018:ffffc900151a73d8 EFLAGS: 00000282 RAX: ffffffff8faf0752 RBX: ffffc900151a7460 RCX: ffffffff813a2bd4 RDX: ffff88802e4b0000 RSI: ffffffff813a2c14 RDI: 0000000000000006 RBP: 0000000000000001 R08: 0000000000000006 R09: ffffffff81c91941 R10: ffffffff81c91897 R11: 0000000000000001 R12: ffffffff8faf0752 R13: ffffffff8faf0752 R14: 000000000002de5b R15: ffffc900151a7495 unwind_next_frame+0x331/0x2390 arch/x86/kernel/unwind_orc.c:495 arch_stack_walk+0xfa/0x170 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122 kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x24/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:522 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x15b/0x1b0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:164 [inline] slab_free_hook mm/slub.c:1809 [inline] slab_free_freelist_hook+0x114/0x1e0 mm/slub.c:1835 slab_free mm/slub.c:3784 [inline] kmem_cache_free+0xfd/0x360 mm/slub.c:3806 pmd_ptlock_free include/linux/mm.h:3013 [inline] pagetable_pmd_dtor include/linux/mm.h:3054 [inline] ___pmd_free_tlb+0x74/0x2e0 arch/x86/mm/pgtable.c:72 __pmd_free_tlb arch/x86/include/asm/pgalloc.h:93 [inline] free_pmd_range mm/memory.c:228 [inline] free_pud_range mm/memory.c:246 [inline] free_p4d_range mm/memory.c:280 [inline] free_pgd_range+0x997/0xb80 mm/memory.c:360 free_pgtables+0x672/0x860 mm/memory.c:407 exit_mmap+0x3d2/0xb60 mm/mmap.c:3285 __mmput+0x12a/0x4d0 kernel/fork.c:1367 mmput+0x62/0x70 kernel/fork.c:1389 exit_mm kernel/exit.c:567 [inline] do_exit+0x9a1/0x2ad0 kernel/exit.c:858 do_group_exit+0xd3/0x2a0 kernel/exit.c:1021 get_signal+0x2395/0x2770 kernel/signal.c:2902 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:309 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11e/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1e/0x60 kernel/entry/common.c:296 do_syscall_64+0x4d/0x110 arch/x86/entry/common.c:88 entry_SYSCALL_64_after_hwframe+0x62/0x6a RIP: 0033:0x7f7a5f67cae9 Code: Unable to access opcode bytes at 0x7f7a5f67cabf. RSP: 002b:00007f7a60469178 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f7a5f79bf88 RCX: 00007f7a5f67cae9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f7a5f79bf88 RBP: 00007f7a5f79bf80 R08: 00007f7a604696c0 R09: 00007f7a604696c0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7a5f79bf8c R13: 000000000000000b R14: 00007ffffa7c0010 R15: 00007ffffa7c00f8 ---------------- Code disassembly (best guess): 0: 66 af scas %es:(%rdi),%ax 2: da 02 fiaddl (%rdx) 4: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1) a: f3 0f 1e fa endbr64 e: 48 8b be b0 01 00 00 mov 0x1b0(%rsi),%rdi 15: e8 b0 ff ff ff call 0xffffffca 1a: 31 c0 xor %eax,%eax 1c: c3 ret 1d: 66 66 2e 0f 1f 84 00 data16 cs nopw 0x0(%rax,%rax,1) 24: 00 00 00 00 28: 66 90 xchg %ax,%ax * 2a: f3 0f 1e fa endbr64 <-- trapping instruction 2e: 65 48 8b 15 a4 ad 7b mov %gs:0x7e7bada4(%rip),%rdx # 0x7e7badda 35: 7e 36: 65 8b 05 a5 ad 7b 7e mov %gs:0x7e7bada5(%rip),%eax # 0x7e7bade2 3d: a9 .byte 0xa9 3e: 00 01 add %al,(%rcx)