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Message-ID: <67af9377.050a0220.21dd3.004e.GAE@google.com> Date: Fri, 14 Feb 2025 11:03:19 -0800 From: syzbot <syzbot+fadf17c17d4661618afc@...kaller.appspotmail.com> To: kent.overstreet@...ux.dev, linux-bcachefs@...r.kernel.org, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: [syzbot] [bcachefs?] BUG: unable to handle kernel paging request in bch2_btree_cache_scan (3) Hello, syzbot found the following issue on: HEAD commit: 128c8f96eb86 Merge tag 'drm-fixes-2025-02-14' of https://g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12038f18580000 kernel config: https://syzkaller.appspot.com/x/.config?x=c776e555cfbdb82d dashboard link: https://syzkaller.appspot.com/bug?extid=fadf17c17d4661618afc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-128c8f96.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a97f78ac821e/vmlinux-128c8f96.xz kernel image: https://storage.googleapis.com/syzbot-assets/f451cf16fc9f/bzImage-128c8f96.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+fadf17c17d4661618afc@...kaller.appspotmail.com BUG: unable to handle page fault for address: ffffe8fffebdf038 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 1b03f067 P4D 1b03f067 PUD 1ed1a067 PMD 1ac49067 PTE 0 Oops: Oops: 0002 [#1] PREEMPT SMP KASAN NOPTI CPU: 0 UID: 0 PID: 80 Comm: kswapd1 Not tainted 6.14.0-rc2-syzkaller-00185-g128c8f96eb86 #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:bch2_btree_cache_scan+0xb57/0xec0 fs/bcachefs/btree_cache.c:563 Code: 24 38 0f 85 12 02 00 00 44 21 2a 48 81 c3 48 b6 04 00 48 89 d8 48 c1 e8 03 80 3c 28 00 74 08 48 89 df e8 bc 08 e2 fd 48 8b 03 <65> 48 ff 40 38 41 80 3c 2e 00 74 08 4c 89 ff e8 a5 08 e2 fd 49 8b RSP: 0018:ffffc9000125f2c0 EFLAGS: 00010246 RAX: 0000607fdefdf000 RBX: ffff88805804b648 RCX: ffffffff8c0998c7 RDX: ffff8880334a802c RSI: 0000000000000008 RDI: ffffc9000125f240 RBP: dffffc0000000000 R08: ffffc9000125f247 R09: 1ffff9200024be48 R10: dffffc0000000000 R11: fffff5200024be49 R12: 0000000000000003 R13: 00000000fffbffff R14: 1ffff9200024beb5 R15: ffffc9000125f5a8 FS: 0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffe8fffebdf038 CR3: 000000000e938000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> do_shrink_slab+0x72d/0x1160 mm/shrinker.c:437 shrink_slab+0x1093/0x14d0 mm/shrinker.c:664 shrink_one+0x43b/0x850 mm/vmscan.c:4868 shrink_many mm/vmscan.c:4929 [inline] lru_gen_shrink_node mm/vmscan.c:5007 [inline] shrink_node+0x379b/0x3e20 mm/vmscan.c:5978 kswapd_shrink_node mm/vmscan.c:6807 [inline] balance_pgdat mm/vmscan.c:6999 [inline] kswapd+0x20f3/0x3b10 mm/vmscan.c:7264 kthread+0x7a9/0x920 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> Modules linked in: CR2: ffffe8fffebdf038 ---[ end trace 0000000000000000 ]--- RIP: 0010:bch2_btree_cache_scan+0xb57/0xec0 fs/bcachefs/btree_cache.c:563 Code: 24 38 0f 85 12 02 00 00 44 21 2a 48 81 c3 48 b6 04 00 48 89 d8 48 c1 e8 03 80 3c 28 00 74 08 48 89 df e8 bc 08 e2 fd 48 8b 03 <65> 48 ff 40 38 41 80 3c 2e 00 74 08 4c 89 ff e8 a5 08 e2 fd 49 8b RSP: 0018:ffffc9000125f2c0 EFLAGS: 00010246 RAX: 0000607fdefdf000 RBX: ffff88805804b648 RCX: ffffffff8c0998c7 RDX: ffff8880334a802c RSI: 0000000000000008 RDI: ffffc9000125f240 RBP: dffffc0000000000 R08: ffffc9000125f247 R09: 1ffff9200024be48 R10: dffffc0000000000 R11: fffff5200024be49 R12: 0000000000000003 R13: 00000000fffbffff R14: 1ffff9200024beb5 R15: ffffc9000125f5a8 FS: 0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffe8fffebdf038 CR3: 000000000e938000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 24 38 and $0x38,%al 2: 0f 85 12 02 00 00 jne 0x21a 8: 44 21 2a and %r13d,(%rdx) b: 48 81 c3 48 b6 04 00 add $0x4b648,%rbx 12: 48 89 d8 mov %rbx,%rax 15: 48 c1 e8 03 shr $0x3,%rax 19: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) 1d: 74 08 je 0x27 1f: 48 89 df mov %rbx,%rdi 22: e8 bc 08 e2 fd call 0xfde208e3 27: 48 8b 03 mov (%rbx),%rax * 2a: 65 48 ff 40 38 incq %gs:0x38(%rax) <-- trapping instruction 2f: 41 80 3c 2e 00 cmpb $0x0,(%r14,%rbp,1) 34: 74 08 je 0x3e 36: 4c 89 ff mov %r15,%rdi 39: e8 a5 08 e2 fd call 0xfde208e3 3e: 49 rex.WB 3f: 8b .byte 0x8b --- 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 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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