Hello, syzbot found the following issue on: HEAD commit: 69e858e0b8b2 Merge tag 'uml-for-linus-6.14-rc1' of git://g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1523f6b0580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d033b14aeef39158 dashboard link: https://syzkaller.appspot.com/bug?extid=1aa04f53a21b8994067f 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=1323f6b0580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-69e858e0.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a53b888c1f3f/vmlinux-69e858e0.xz kernel image: https://storage.googleapis.com/syzbot-assets/6b5e17edafc0/bzImage-69e858e0.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/6e8041af9503/mount_1.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+1aa04f53a21b8994067f@xxxxxxxxxxxxxxxxxxxxxxxxx Oops: general protection fault, probably for non-canonical address 0xdffffc0000000060: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000300-0x0000000000000307] CPU: 0 UID: 0 PID: 6160 Comm: syz.3.224 Not tainted 6.13.0-syzkaller-09760-g69e858e0b8b2 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:strcmp+0x42/0xa0 lib/string.c:277 Code: 00 fc ff df 31 db 49 8d 3c 1c 48 89 f8 48 c1 e8 03 42 0f b6 04 38 84 c0 75 29 41 0f b6 2c 1c 49 8d 3c 1e 48 89 f8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 75 20 41 3a 2c 1e 75 2a 48 ff c3 40 84 ed 75 RSP: 0018:ffffc900000077f8 EFLAGS: 00010006 RAX: 0000000000000060 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: 0000000000000001 RSI: 0000000000000300 RDI: 0000000000000300 RBP: 0000000000000026 R08: ffffffff942f696f R09: 1ffffffff285ed2d R10: dffffc0000000000 R11: fffffbfff285ed2e R12: ffffffff8c608700 R13: ffffffff93cd6c88 R14: 0000000000000300 R15: dffffc0000000000 FS: 00007f97c077e6c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1e6ddd1000 CR3: 0000000058d3a000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> count_matching_names+0xfa/0x1c0 kernel/locking/lockdep.c:877 register_lock_class+0x450/0x980 kernel/locking/lockdep.c:1342 __lock_acquire+0xf3/0x2100 kernel/locking/lockdep.c:5103 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 call_timer_fn+0xdd/0x650 kernel/time/timer.c:1786 expire_timers kernel/time/timer.c:1835 [inline] __run_timers kernel/time/timer.c:2414 [inline] __run_timer_base+0x695/0x8e0 kernel/time/timer.c:2426 run_timer_base kernel/time/timer.c:2435 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2445 handle_softirqs+0x2d4/0x9b0 kernel/softirq.c:561 __do_softirq kernel/softirq.c:595 [inline] invoke_softirq kernel/softirq.c:435 [inline] __irq_exit_rcu+0xf7/0x220 kernel/softirq.c:662 irq_exit_rcu+0x9/0x30 kernel/softirq.c:678 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:lock_acquire+0x264/0x550 kernel/locking/lockdep.c:5855 Code: 2b 00 74 08 4c 89 f7 e8 8a 2b 8b 00 f6 44 24 61 02 0f 85 85 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25 RSP: 0018:ffffc9000ce9f040 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 1ffff920019d3e14 RCX: ffff8880347e0ae8 RDX: dffffc0000000000 RSI: ffffffff8c0ab8e0 RDI: ffffffff8c608060 RBP: ffffc9000ce9f190 R08: ffffffff942f6847 R09: 1ffffffff285ed08 R10: dffffc0000000000 R11: fffffbfff285ed09 R12: 1ffff920019d3e10 R13: dffffc0000000000 R14: ffffc9000ce9f0a0 R15: 0000000000000246 rcu_lock_acquire include/linux/rcupdate.h:337 [inline] rcu_read_lock include/linux/rcupdate.h:849 [inline] is_bpf_text_address+0x46/0x2a0 kernel/bpf/core.c:772 kernel_text_address+0xa7/0xe0 kernel/extable.c:125 __kernel_text_address+0xd/0x40 kernel/extable.c:79 unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:369 arch_stack_walk+0xfd/0x150 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122 save_stack+0xfb/0x1f0 mm/page_owner.c:156 __reset_page_owner+0x76/0x430 mm/page_owner.c:297 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_unref_folios+0xe40/0x18b0 mm/page_alloc.c:2707 folios_put_refs+0x76c/0x860 mm/swap.c:994 folio_batch_release include/linux/pagevec.h:101 [inline] shmem_undo_range+0x593/0x1820 mm/shmem.c:1112 shmem_truncate_range mm/shmem.c:1224 [inline] shmem_evict_inode+0x29b/0xa80 mm/shmem.c:1352 evict+0x4e8/0x9a0 fs/inode.c:796 __dentry_kill+0x20d/0x630 fs/dcache.c:643 dput+0x19f/0x2b0 fs/dcache.c:885 __fput+0x60b/0x9f0 fs/file_table.c:458 __do_sys_close fs/open.c:1579 [inline] __se_sys_close fs/open.c:1564 [inline] __x64_sys_close+0x7f/0x110 fs/open.c:1564 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f97bf98ba0a Code: 48 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c 24 0c e8 43 91 02 00 8b 7c 24 0c 89 c2 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 36 89 d7 89 44 24 0c e8 a3 91 02 00 8b 44 24 RSP: 002b:00007f97c077de00 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00007f97bf98ba0a RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000005939 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003 R13: 00007f97c077def0 R14: 00007f97c077deb0 R15: 00007f97b6600000 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:strcmp+0x42/0xa0 lib/string.c:277 Code: 00 fc ff df 31 db 49 8d 3c 1c 48 89 f8 48 c1 e8 03 42 0f b6 04 38 84 c0 75 29 41 0f b6 2c 1c 49 8d 3c 1e 48 89 f8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 75 20 41 3a 2c 1e 75 2a 48 ff c3 40 84 ed 75 RSP: 0018:ffffc900000077f8 EFLAGS: 00010006 RAX: 0000000000000060 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: 0000000000000001 RSI: 0000000000000300 RDI: 0000000000000300 RBP: 0000000000000026 R08: ffffffff942f696f R09: 1ffffffff285ed2d R10: dffffc0000000000 R11: fffffbfff285ed2e R12: ffffffff8c608700 R13: ffffffff93cd6c88 R14: 0000000000000300 R15: dffffc0000000000 FS: 00007f97c077e6c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1e6ddd1000 CR3: 0000000058d3a000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 3 bytes skipped: 0: df 31 fbstp (%rcx) 2: db 49 8d fisttpl -0x73(%rcx) 5: 3c 1c cmp $0x1c,%al 7: 48 89 f8 mov %rdi,%rax a: 48 c1 e8 03 shr $0x3,%rax e: 42 0f b6 04 38 movzbl (%rax,%r15,1),%eax 13: 84 c0 test %al,%al 15: 75 29 jne 0x40 17: 41 0f b6 2c 1c movzbl (%r12,%rbx,1),%ebp 1c: 49 8d 3c 1e lea (%r14,%rbx,1),%rdi 20: 48 89 f8 mov %rdi,%rax 23: 48 c1 e8 03 shr $0x3,%rax * 27: 42 0f b6 04 38 movzbl (%rax,%r15,1),%eax <-- trapping instruction 2c: 84 c0 test %al,%al 2e: 75 20 jne 0x50 30: 41 3a 2c 1e cmp (%r14,%rbx,1),%bpl 34: 75 2a jne 0x60 36: 48 ff c3 inc %rbx 39: 40 84 ed test %bpl,%bpl 3c: 75 .byte 0x75 --- 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
