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Message-ID: <67c7e711.050a0220.15b4b9.001f.GAE@google.com> Date: Tue, 04 Mar 2025 21:54:25 -0800 From: syzbot <syzbot+c32100a0bb8cae0c3dde@...kaller.appspotmail.com> To: andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org, daniel@...earbox.net, eddyz87@...il.com, haoluo@...gle.com, john.fastabend@...il.com, jolsa@...nel.org, kent.overstreet@...ux.dev, kpsingh@...nel.org, linux-bcachefs@...r.kernel.org, linux-kernel@...r.kernel.org, martin.lau@...ux.dev, sdf@...ichev.me, song@...nel.org, syzkaller-bugs@...glegroups.com, yonghong.song@...ux.dev Subject: [syzbot] [bpf?] [bcachefs?] BUG: unable to handle kernel paging request in handle_softirqs Hello, syzbot found the following issue on: HEAD commit: 276f98efb64a Merge tag 'block-6.14-20250228' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16614864580000 kernel config: https://syzkaller.appspot.com/x/.config?x=5b4c41bdaeea1964 dashboard link: https://syzkaller.appspot.com/bug?extid=c32100a0bb8cae0c3dde 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=11614864580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-276f98ef.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/5a036150d62e/vmlinux-276f98ef.xz kernel image: https://storage.googleapis.com/syzbot-assets/f0b6c8e5972f/bzImage-276f98ef.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/65413c368879/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c32100a0bb8cae0c3dde@...kaller.appspotmail.com kernel tried to execute NX-protected page - exploit attempt? (uid: 0) BUG: unable to handle page fault for address: ffff8880316c0000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0011) - permissions violation PGD 1ac01067 P4D 1ac01067 PUD 1ac02067 PMD 1c3d0063 PTE 80000000316c0163 Oops: Oops: 0011 [#1] PREEMPT SMP KASAN NOPTI CPU: 0 UID: 0 PID: 7082 Comm: syz.2.568 Not tainted 6.14.0-rc4-syzkaller-00212-g276f98efb64a #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:0xffff8880316c0000 Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 20 6e 31 80 88 ff ff 00 40 eb 30 80 88 ff ff 08 00 00 00 0c 00 RSP: 0018:ffffc90000007bd8 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 1ffff1100840de14 RCX: ffff888000a5af28 RDX: dffffc0000000000 RSI: ffffffff8c2ab700 RDI: ffff88804206f098 RBP: ffffc90000007e10 R08: ffffffff9454985f R09: 1ffffffff28a930b R10: dffffc0000000000 R11: ffff8880316c0000 R12: ffffffff81a8d7d7 R13: ffff88804206f0a0 R14: ffff8880316c0000 R15: ffff88804206f098 FS: 00007ff346e2f6c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff8880316c0000 CR3: 0000000042300000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> 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 3a 45 8c 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:ffffc9000260f040 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 1ffff920004c1e14 RCX: ffff888000a5af28 RDX: dffffc0000000000 RSI: ffffffff8c2ab700 RDI: ffffffff8c80f060 RBP: ffffc9000260f190 R08: ffffffff94549847 R09: 1ffffffff28a9308 R10: dffffc0000000000 R11: fffffbfff28a9309 R12: 1ffff920004c1e10 R13: dffffc0000000000 R14: ffffc9000260f0a0 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:472 __do_sys_close fs/open.c:1580 [inline] __se_sys_close fs/open.c:1565 [inline] __x64_sys_close+0x7f/0x110 fs/open.c:1565 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: 0033:0x7ff345f8bdca 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:00007ff346e2ee00 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00007ff345f8bdca RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 0000000000000002 R08: 0000000000000000 R09: 000000000000590c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003 R13: 00007ff346e2eef0 R14: 00007ff346e2eeb0 R15: 00007ff33cc00000 </TASK> Modules linked in: CR2: ffff8880316c0000 ---[ end trace 0000000000000000 ]--- RIP: 0010:0xffff8880316c0000 Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 20 6e 31 80 88 ff ff 00 40 eb 30 80 88 ff ff 08 00 00 00 0c 00 RSP: 0018:ffffc90000007bd8 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 1ffff1100840de14 RCX: ffff888000a5af28 RDX: dffffc0000000000 RSI: ffffffff8c2ab700 RDI: ffff88804206f098 RBP: ffffc90000007e10 R08: ffffffff9454985f R09: 1ffffffff28a930b R10: dffffc0000000000 R11: ffff8880316c0000 R12: ffffffff81a8d7d7 R13: ffff88804206f0a0 R14: ffff8880316c0000 R15: ffff88804206f098 FS: 00007ff346e2f6c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff8880316c0000 CR3: 0000000042300000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 28: 00 00 add %al,(%rax) * 2a: 00 20 add %ah,(%rax) <-- trapping instruction 2c: 6e outsb %ds:(%rsi),(%dx) 2d: 31 80 88 ff ff 00 xor %eax,0xffff88(%rax) 33: 40 eb 30 rex jmp 0x66 36: 80 88 ff ff 08 00 00 orb $0x0,0x8ffff(%rax) 3d: 00 0c 00 add %cl,(%rax,%rax,1) --- 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@...glegroups.com. 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
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