Hello, syzbot found the following issue on:
HEAD commit: 75fa778d74b7 Add linux-next specific files for 20240510 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=17a13f70980000 kernel config: https://syzkaller.appspot.com/x/.config?x=ccdd3ebd6715749a dashboard link: https://syzkaller.appspot.com/bug?extid=fff6b0fb00259873576a 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=1679303f180000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15a2743f180000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/ad9391835bcf/disk-75fa778d.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d827b3da9a26/vmlinux-75fa778d.xz kernel image: https://storage.googleapis.com/syzbot-assets/8f32f0182388/bzImage-75fa778d.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/134862d610aa/mount_0.gz The issue was bisected to: commit 023f9ac9f70fbb1d94d27583fc06225355c73a67 Author: Kent Overstreet <[email protected]> Date: Wed Dec 20 02:58:20 2023 +0000 bcachefs: Delete dio read alignment check bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=130be15c980000 final oops: https://syzkaller.appspot.com/x/report.txt?x=108be15c980000 console output: https://syzkaller.appspot.com/x/log.txt?x=170be15c980000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: [email protected] Fixes: 023f9ac9f70f ("bcachefs: Delete dio read alignment check") ================================================================== BUG: KASAN: stack-out-of-bounds in sg_mark_end include/linux/scatterlist.h:258 [inline] BUG: KASAN: stack-out-of-bounds in __bch2_encrypt_bio+0x84d/0xb10 fs/bcachefs/checksum.c:355 Read of size 8 at addr ffffc900001176a0 by task kworker/u8:1/12 CPU: 0 PID: 12 Comm: kworker/u8:1 Not tainted 6.9.0-rc7-next-20240510-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Workqueue: events_unbound __bch2_read_endio Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 sg_mark_end include/linux/scatterlist.h:258 [inline] __bch2_encrypt_bio+0x84d/0xb10 fs/bcachefs/checksum.c:355 bch2_encrypt_bio fs/bcachefs/checksum.h:97 [inline] __bch2_read_endio+0x8ab/0x23c0 fs/bcachefs/io_read.c:601 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312 worker_thread+0x86d/0xd70 kernel/workqueue.c:3393 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> The buggy address belongs to stack of task kworker/u8:1/12 and is located at offset 1120 in frame: __bch2_encrypt_bio+0x0/0xb10 fs/bcachefs/checksum.c:72 This frame has 5 objects: [32, 48) 'nonce.i115' [64, 528) '__req_desc.i116' [592, 608) 'nonce.i' [624, 1088) '__req_desc.i' [1152, 1664) 'sgl' The buggy address belongs to the virtual mapping at [ffffc90000110000, ffffc90000119000) created by: copy_process+0x5d1/0x3dc0 kernel/fork.c:2220 The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x17297 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x2dc2(GFP_KERNEL|__GFP_HIGHMEM|__GFP_NOWARN|__GFP_ZERO), pid 2, tgid 2 (kthreadd), ts 2480284041, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1468 prep_new_page mm/page_alloc.c:1476 [inline] get_page_from_freelist+0x2ce2/0x2d90 mm/page_alloc.c:3438 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4696 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265 vm_area_alloc_pages mm/vmalloc.c:3567 [inline] __vmalloc_area_node mm/vmalloc.c:3643 [inline] __vmalloc_node_range_noprof+0x9a4/0x1490 mm/vmalloc.c:3824 alloc_thread_stack_node kernel/fork.c:309 [inline] dup_task_struct+0x444/0x8c0 kernel/fork.c:1115 copy_process+0x5d1/0x3dc0 kernel/fork.c:2220 kernel_clone+0x226/0x8f0 kernel/fork.c:2797 kernel_thread+0x1bc/0x240 kernel/fork.c:2859 create_kthread kernel/kthread.c:412 [inline] kthreadd+0x60d/0x810 kernel/kthread.c:765 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 page_owner free stack trace missing Memory state around the buggy address: ffffc90000117580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc90000117600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffc90000117680: f2 f2 f2 f2 f2 f2 f2 f2 00 00 00 00 00 00 00 00 ^ ffffc90000117700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc90000117780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== --- 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 [email protected]. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection 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
