======================================================== WARNING: possible irq lock inversion dependency detected 6.7.0-rc1-next-20231117-syzkaller #0 Not tainted -------------------------------------------------------- syz-executor.3/14563 just changed the state of lock: ffff8880299964a0 (&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 *** 5 locks held by syz-executor.3/14563: #0: ffff888026002220 (&vma->vm_lock->lock){++++}-{3:3}, at: vma_start_read include/linux/mm.h:663 [inline] #0: ffff888026002220 (&vma->vm_lock->lock){++++}-{3:3}, at: lock_vma_under_rcu+0x1e2/0x950 mm/memory.c:5506 #1: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline] #1: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline] #1: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: do_fault_around mm/memory.c:4591 [inline] #1: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: do_read_fault mm/memory.c:4625 [inline] #1: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: do_fault mm/memory.c:4768 [inline] #1: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: do_pte_missing mm/memory.c:3736 [inline] #1: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: handle_pte_fault mm/memory.c:5044 [inline] #1: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: __handle_mm_fault+0x251f/0x3d70 mm/memory.c:5185 #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: filemap_map_pages+0x178/0x1250 mm/filemap.c:3520 #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: ffff88807d742798 (ptlock_ptr(ptdesc)#2){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] #4: ffff88807d742798 (ptlock_ptr(ptdesc)#2){+.+.}-{2:2}, at: __pte_offset_map_lock+0xf1/0x2f0 mm/pgtable-generic.c:373 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 PageTail include/linux/page-flags.h:286 [inline] folio_flags+0x33/0x1f0 include/linux/page-flags.h:313 folio_test_locked include/linux/page-flags.h:467 [inline] next_uptodate_folio+0xa9/0x550 mm/filemap.c:3393 filemap_map_pages+0x534/0x1250 mm/filemap.c:3556 do_fault_around mm/memory.c:4592 [inline] do_read_fault mm/memory.c:4625 [inline] do_fault mm/memory.c:4768 [inline] do_pte_missing mm/memory.c:3736 [inline] handle_pte_fault mm/memory.c:5044 [inline] __handle_mm_fault+0x25ac/0x3d70 mm/memory.c:5185 handle_mm_fault+0x476/0xa00 mm/memory.c:5350 do_user_addr_fault+0x309/0x1000 arch/x86/mm/fault.c:1364 handle_page_fault arch/x86/mm/fault.c:1505 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1561 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 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_timer_gettime+0x76/0x180 kernel/time/posix-timers.c:703 __do_sys_timer_gettime kernel/time/posix-timers.c:724 [inline] __se_sys_timer_gettime kernel/time/posix-timers.c:719 [inline] __x64_sys_timer_gettime+0xd5/0x170 kernel/time/posix-timers.c:719 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 PageTail include/linux/page-flags.h:286 [inline] folio_flags+0x33/0x1f0 include/linux/page-flags.h:313 folio_test_locked include/linux/page-flags.h:467 [inline] next_uptodate_folio+0xa9/0x550 mm/filemap.c:3393 filemap_map_pages+0x534/0x1250 mm/filemap.c:3556 do_fault_around mm/memory.c:4592 [inline] do_read_fault mm/memory.c:4625 [inline] do_fault mm/memory.c:4768 [inline] do_pte_missing mm/memory.c:3736 [inline] handle_pte_fault mm/memory.c:5044 [inline] __handle_mm_fault+0x25ac/0x3d70 mm/memory.c:5185 handle_mm_fault+0x476/0xa00 mm/memory.c:5350 do_user_addr_fault+0x309/0x1000 arch/x86/mm/fault.c:1364 handle_page_fault arch/x86/mm/fault.c:1505 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1561 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 stack backtrace: CPU: 1 PID: 14563 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_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:PageTail include/linux/page-flags.h:286 [inline] RIP: 0010:folio_flags+0x33/0x1f0 include/linux/page-flags.h:313 Code: 89 f3 e8 00 dd d1 ff 48 8d 7d 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 8c 01 00 00 4c 8b 65 08 <31> ff 41 83 e4 01 4c 89 e6 e8 5f d8 d1 ff 4d 85 e4 0f 85 fb 00 00 RSP: 0000:ffffc9000aa97b28 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff81b68e41 RDX: 1ffffd40005cc579 RSI: ffffffff81b63210 RDI: ffffea0002e62bc8 RBP: ffffea0002e62bc0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000005 R12: ffffea0001ff3fc8 R13: 000000000000004f R14: 000000000000004a R15: dffffc0000000000 folio_test_locked include/linux/page-flags.h:467 [inline] next_uptodate_folio+0xa9/0x550 mm/filemap.c:3393 filemap_map_pages+0x534/0x1250 mm/filemap.c:3556 do_fault_around mm/memory.c:4592 [inline] do_read_fault mm/memory.c:4625 [inline] do_fault mm/memory.c:4768 [inline] do_pte_missing mm/memory.c:3736 [inline] handle_pte_fault mm/memory.c:5044 [inline] __handle_mm_fault+0x25ac/0x3d70 mm/memory.c:5185 handle_mm_fault+0x476/0xa00 mm/memory.c:5350 do_user_addr_fault+0x309/0x1000 arch/x86/mm/fault.c:1364 handle_page_fault arch/x86/mm/fault.c:1505 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1561 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0033:0x7f70b484ff70 Code: Unable to access opcode bytes at 0x7f70b484ff46. RSP: 002b:00007ffc0e7e1eb8 EFLAGS: 00010246 RAX: 00007f70b497b660 RBX: 0000000000000000 RCX: 00007f70b497b660 RDX: 0000000000000000 RSI: 00007f70b497b660 RDI: 0000555555e37760 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000555555e37750 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000001 ---------------- Code disassembly (best guess): 0: 89 f3 mov %esi,%ebx 2: e8 00 dd d1 ff call 0xffd1dd07 7: 48 8d 7d 08 lea 0x8(%rbp),%rdi b: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 12: fc ff df 15: 48 89 fa mov %rdi,%rdx 18: 48 c1 ea 03 shr $0x3,%rdx 1c: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 20: 0f 85 8c 01 00 00 jne 0x1b2 26: 4c 8b 65 08 mov 0x8(%rbp),%r12 * 2a: 31 ff xor %edi,%edi <-- trapping instruction 2c: 41 83 e4 01 and $0x1,%r12d 30: 4c 89 e6 mov %r12,%rsi 33: e8 5f d8 d1 ff call 0xffd1d897 38: 4d 85 e4 test %r12,%r12 3b: 0f .byte 0xf 3c: 85 fb test %edi,%ebx