On Sun, 03 Nov 2024 08:49:26 -0800 syzbot <syzbot+56dc65adbd1d2ae1f844@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > Hello, > > syzbot found the following issue on: Help. I don't understand this lockdep report. add_stack_record_to_list() is taking spin_lock_irqsave(stack_list_lock) from within softirq. all seems well? > HEAD commit: f9f24ca362a4 Add linux-next specific files for 20241031 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=11ac6630580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=328572ed4d152be9 > dashboard link: https://syzkaller.appspot.com/bug?extid=56dc65adbd1d2ae1f844 > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=171232a7980000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/eb84549dd6b3/disk-f9f24ca3.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/beb29bdfa297/vmlinux-f9f24ca3.xz > kernel image: https://storage.googleapis.com/syzbot-assets/8881fe3245ad/bzImage-f9f24ca3.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+56dc65adbd1d2ae1f844@xxxxxxxxxxxxxxxxxxxxxxxxx > > ============================= > [ BUG: Invalid wait context ] > 6.12.0-rc5-next-20241031-syzkaller #0 Not tainted > ----------------------------- > syz.1.44/6083 is trying to lock: > ffffffff8ea733d8 (stack_list_lock){-.-.}-{3:3}, at: add_stack_record_to_list mm/page_owner.c:182 [inline] > ffffffff8ea733d8 (stack_list_lock){-.-.}-{3:3}, at: inc_stack_record_count mm/page_owner.c:214 [inline] > ffffffff8ea733d8 (stack_list_lock){-.-.}-{3:3}, at: __set_page_owner+0x5cb/0x800 mm/page_owner.c:329 > other info that might help us debug this: > context-{2:2} > 1 lock held by syz.1.44/6083: > #0: ffff8880240995e0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:129 [inline] > #0: ffff8880240995e0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x2da/0xcb0 mm/mmap.c:1701 > stack backtrace: > CPU: 1 UID: 0 PID: 6083 Comm: syz.1.44 Not tainted 6.12.0-rc5-next-20241031-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 > Call Trace: > <IRQ> > __dump_stack lib/dump_stack.c:94 [inline] > dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 > print_lock_invalid_wait_context kernel/locking/lockdep.c:4826 [inline] > check_wait_context kernel/locking/lockdep.c:4898 [inline] > __lock_acquire+0x15a8/0x2100 kernel/locking/lockdep.c:5176 > lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 > __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] > _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162 > add_stack_record_to_list mm/page_owner.c:182 [inline] > inc_stack_record_count mm/page_owner.c:214 [inline] > __set_page_owner+0x5cb/0x800 mm/page_owner.c:329 > set_page_owner include/linux/page_owner.h:32 [inline] > post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1541 > prep_new_page mm/page_alloc.c:1549 [inline] > get_page_from_freelist+0x3725/0x3870 mm/page_alloc.c:3495 > __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4771 > alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265 > stack_depot_save_flags+0x666/0x830 lib/stackdepot.c:627 > kasan_save_stack+0x4f/0x60 mm/kasan/common.c:48 > __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:544 > task_work_add+0xd9/0x490 kernel/task_work.c:77 > __run_posix_cpu_timers kernel/time/posix-cpu-timers.c:1219 [inline] > run_posix_cpu_timers+0x6ac/0x810 kernel/time/posix-cpu-timers.c:1418 > tick_sched_handle kernel/time/tick-sched.c:276 [inline] > tick_nohz_handler+0x37c/0x500 kernel/time/tick-sched.c:297 > __run_hrtimer kernel/time/hrtimer.c:1691 [inline] > __hrtimer_run_queues+0x551/0xd50 kernel/time/hrtimer.c:1755 > hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1817 > local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline] > __sysvec_apic_timer_interrupt+0x110/0x420 arch/x86/kernel/apic/apic.c:1055 > instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] > sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1049 > asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 > RIP: 0010:variable_ffs arch/x86/include/asm/bitops.h:321 [inline] > RIP: 0010:handle_softirqs+0x1e3/0x980 kernel/softirq.c:542 > Code: 7c 24 70 45 0f b7 e4 48 c7 c7 20 c5 09 8c e8 c4 6c 6c 0a 65 66 c7 05 32 53 ac 7e 00 00 e8 05 67 45 00 fb 49 c7 c6 c0 a0 60 8e <b8> ff ff ff ff 41 0f bc c4 41 89 c7 41 ff c7 0f 84 eb 03 00 00 44 > RSP: 0018:ffffc90000a18e40 EFLAGS: 00000286 > RAX: b8b036f9cad4b600 RBX: ffffc90000a18ee0 RCX: ffffffff8170c69a > RDX: dffffc0000000000 RSI: ffffffff8c0ad3a0 RDI: ffffffff8c604dc0 > RBP: ffffc90000a18f50 R08: ffffffff942cd877 R09: 1ffffffff2859b0e > R10: dffffc0000000000 R11: fffffbfff2859b0f R12: 0000000000000010 > R13: 0000000000000000 R14: ffffffff8e60a0c0 R15: 1ffff11004bb4780 > __do_softirq kernel/softirq.c:588 [inline] > invoke_softirq kernel/softirq.c:428 [inline] > __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637 > irq_exit_rcu+0x9/0x30 kernel/softirq.c:649 > common_interrupt+0xb9/0xd0 arch/x86/kernel/irq.c:278 > </IRQ> > <TASK> > asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693 > RIP: 0010:lock_is_held_type+0x13b/0x190 > Code: 75 44 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 4c 41 f7 c4 00 02 00 00 74 01 fb 65 48 8b 04 25 28 00 00 00 <48> 3b 44 24 08 75 42 89 d8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f > RSP: 0018:ffffc9000307f618 EFLAGS: 00000206 > RAX: b8b036f9cad4b600 RBX: 0000000000000001 RCX: ffff888025da3c00 > RDX: ffff888025da3c00 RSI: ffffffff8c0ae580 RDI: ffffffff8c604dc0 > RBP: 0000000000000000 R08: ffffffff81e2d437 R09: ffffffff8bb86877 > R10: 0000000000000004 R11: ffff888025da3c00 R12: 0000000000000246 > R13: ffff888025da3c00 R14: 0000000000000000 R15: ffff8880240995e0 > rwsem_assert_held_write include/linux/rwsem.h:203 [inline] > mmap_assert_write_locked include/linux/mmap_lock.h:70 [inline] > __is_vma_write_locked include/linux/mm.h:747 [inline] > vma_start_write include/linux/mm.h:766 [inline] > free_pgtables+0x433/0x840 mm/memory.c:406 > exit_mmap+0x4cd/0xcb0 mm/mmap.c:1704 > __mmput+0x115/0x390 kernel/fork.c:1344 > exit_mm+0x220/0x310 kernel/exit.c:570 > do_exit+0x9b2/0x28e0 kernel/exit.c:925 > do_group_exit+0x207/0x2c0 kernel/exit.c:1087 > get_signal+0x16a3/0x1740 kernel/signal.c:2884 > arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337 > exit_to_user_mode_loop kernel/entry/common.c:111 [inline] > exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] > __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] > syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218 > do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7f3e8657e719 > Code: Unable to access opcode bytes at 0x7f3e8657e6ef. > RSP: 002b:00007f3e872b30e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca > RAX: 0000000000000001 RBX: 00007f3e86735f88 RCX: 00007f3e8657e719 > RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f3e86735f8c > RBP: 00007f3e86735f80 R08: 7fffffffffffffff R09: 0000000000000000 > R10: 000000000000003c R11: 0000000000000246 R12: 00007f3e86735f8c > R13: 0000000000000000 R14: 00007fff211a29e0 R15: 00007fff211a2ac8 > </TASK> > ---------------- > Code disassembly (best guess): > 0: 7c 24 jl 0x26 > 2: 70 45 jo 0x49 > 4: 0f b7 e4 movzwl %sp,%esp > 7: 48 c7 c7 20 c5 09 8c mov $0xffffffff8c09c520,%rdi > e: e8 c4 6c 6c 0a call 0xa6c6cd7 > 13: 65 66 c7 05 32 53 ac movw $0x0,%gs:0x7eac5332(%rip) # 0x7eac534f > 1a: 7e 00 00 > 1d: e8 05 67 45 00 call 0x456727 > 22: fb sti > 23: 49 c7 c6 c0 a0 60 8e mov $0xffffffff8e60a0c0,%r14 > * 2a: b8 ff ff ff ff mov $0xffffffff,%eax <-- trapping instruction > 2f: 41 0f bc c4 bsf %r12d,%eax > 33: 41 89 c7 mov %eax,%r15d > 36: 41 ff c7 inc %r15d > 39: 0f 84 eb 03 00 00 je 0x42a > 3f: 44 rex.R > > > --- > This report is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > > If the report is already addressed, let syzbot know by replying with: > #syz fix: exact-commit-title > > If you want syzbot to run the reproducer, reply with: > #syz test: git://repo/address.git branch-or-commit-hash > If you attach or paste a git patch, syzbot will apply it before testing. > > If you want to overwrite report's subsystems, reply with: > #syz set subsystems: new-subsystem > (See the list of subsystem names on the web dashboard) > > If the report is a duplicate of another one, reply with: > #syz dup: exact-subject-of-another-report > > If you want to undo deduplication, reply with: > #syz undup
