syzbot


KASAN: use-after-free Write in txEnd

Status: upstream: reported C repro on 2024/02/14 01:53
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+56e00af64faba56750bf@syzkaller.appspotmail.com
First crash: 68d, last: 2d02h
Bug presence (1)
Date Name Commit Repro Result
2024/04/19 upstream (ToT) 2d412262ccfd C [report] KASAN: slab-use-after-free Write in txEnd
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 KASAN: use-after-free Write in txEnd C 12 15h30m 42d 0/3 upstream: reported C repro on 2024/03/11 13:53
upstream general protection fault in txEnd jfs C error 88 5h22m 485d 0/26 upstream: reported C repro on 2022/12/23 23:37
linux-4.14 general protection fault in txEnd jfs fat C 1 415d 482d 0/1 upstream: reported C repro on 2022/12/27 07:15
Fix bisection attempts (1)
Created Duration User Patch Repo Result
2024/03/24 11:40 1h32m bisect fix linux-5.15.y job log (0) log

Sample crash report:
 ... Log Wrap ... Log Wrap ... Log Wrap ...
 ... Log Wrap ... Log Wrap ... Log Wrap ...
==================================================================
BUG: KASAN: use-after-free in instrument_atomic_write include/linux/instrumented.h:86 [inline]
BUG: KASAN: use-after-free in clear_bit include/asm-generic/bitops/instrumented-atomic.h:41 [inline]
BUG: KASAN: use-after-free in txEnd+0x350/0x560 fs/jfs/jfs_txnmgr.c:554
Write of size 8 at addr ffff88801d581040 by task jfsCommit/275

CPU: 1 PID: 275 Comm: jfsCommit Not tainted 5.15.156-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
 print_address_description+0x63/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0x16b/0x1c0 mm/kasan/report.c:451
 kasan_check_range+0x27e/0x290 mm/kasan/generic.c:189
 instrument_atomic_write include/linux/instrumented.h:86 [inline]
 clear_bit include/asm-generic/bitops/instrumented-atomic.h:41 [inline]
 txEnd+0x350/0x560 fs/jfs/jfs_txnmgr.c:554
 txLazyCommit fs/jfs/jfs_txnmgr.c:2718 [inline]
 jfs_lazycommit+0x60d/0xc30 fs/jfs/jfs_txnmgr.c:2766
 kthread+0x3f6/0x4f0 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:300
 </TASK>

Allocated by task 3531:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 ____kasan_kmalloc+0xba/0xf0 mm/kasan/common.c:513
 kasan_kmalloc include/linux/kasan.h:264 [inline]
 kmem_cache_alloc_trace+0x143/0x290 mm/slub.c:3247
 kmalloc include/linux/slab.h:591 [inline]
 kzalloc include/linux/slab.h:721 [inline]
 open_inline_log fs/jfs/jfs_logmgr.c:1167 [inline]
 lmLogOpen+0x314/0x1030 fs/jfs/jfs_logmgr.c:1077
 jfs_mount_rw+0xe3/0x640 fs/jfs/jfs_mount.c:253
 jfs_fill_super+0x69f/0xc70 fs/jfs/super.c:570
 mount_bdev+0x2c9/0x3f0 fs/super.c:1387
 legacy_get_tree+0xeb/0x180 fs/fs_context.c:611
 vfs_get_tree+0x88/0x270 fs/super.c:1517
 do_new_mount+0x2ba/0xb40 fs/namespace.c:3005
 do_mount fs/namespace.c:3348 [inline]
 __do_sys_mount fs/namespace.c:3556 [inline]
 __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3533
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

Freed by task 3528:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4b/0x80 mm/kasan/common.c:46
 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
 ____kasan_slab_free+0xd8/0x120 mm/kasan/common.c:366
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:1705 [inline]
 slab_free_freelist_hook+0xdd/0x160 mm/slub.c:1731
 slab_free mm/slub.c:3499 [inline]
 kfree+0xf1/0x270 mm/slub.c:4559
 lmLogClose+0x29d/0x530
 jfs_umount+0x298/0x370 fs/jfs/jfs_umount.c:116
 jfs_put_super+0x86/0x180 fs/jfs/super.c:194
 generic_shutdown_super+0x136/0x2c0 fs/super.c:475
 kill_block_super+0x7a/0xe0 fs/super.c:1414
 deactivate_locked_super+0xa0/0x110 fs/super.c:335
 cleanup_mnt+0x44e/0x500 fs/namespace.c:1143
 task_work_run+0x129/0x1a0 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:181
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x5d/0x240 kernel/entry/common.c:307
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

The buggy address belongs to the object at ffff88801d581000
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 64 bytes inside of
 1024-byte region [ffff88801d581000, ffff88801d581400)
The buggy address belongs to the page:
page:ffffea0000756000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1d580
head:ffffea0000756000 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff80000010200(slab|head|node=0|zone=1|lastcpupid=0xfff)
raw: 00fff80000010200 0000000000000000 0000000100000001 ffff888011c41dc0
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, ts 7531459348, free_ts 0
 prep_new_page mm/page_alloc.c:2426 [inline]
 get_page_from_freelist+0x322a/0x33c0 mm/page_alloc.c:4159
 __alloc_pages+0x272/0x700 mm/page_alloc.c:5423
 __alloc_pages_node include/linux/gfp.h:570 [inline]
 alloc_slab_page mm/slub.c:1777 [inline]
 allocate_slab mm/slub.c:1912 [inline]
 new_slab+0xb1/0x4b0 mm/slub.c:1975
 ___slab_alloc+0x6f6/0xe10 mm/slub.c:3008
 __slab_alloc mm/slub.c:3095 [inline]
 slab_alloc_node mm/slub.c:3186 [inline]
 kmem_cache_alloc_node_trace+0x1ce/0x2e0 mm/slub.c:3270
 kmalloc_node include/linux/slab.h:609 [inline]
 kzalloc_node include/linux/slab.h:732 [inline]
 sbitmap_queue_init_node+0x178/0x880 lib/sbitmap.c:445
 bt_alloc block/blk-mq-tag.c:471 [inline]
 blk_mq_init_bitmaps block/blk-mq-tag.c:485 [inline]
 blk_mq_init_bitmap_tags block/blk-mq-tag.c:500 [inline]
 blk_mq_init_tags+0x1c6/0x380 block/blk-mq-tag.c:563
 blk_mq_alloc_rq_map+0x7a/0x190 block/blk-mq.c:2425
 blk_mq_sched_alloc_tags block/blk-mq-sched.c:531 [inline]
 blk_mq_init_sched+0x21c/0x1030 block/blk-mq-sched.c:618
 elevator_init_mq+0x368/0x4d0 block/elevator.c:705
 device_add_disk+0x8e/0xd60 block/genhd.c:406
 add_mtd_blktrans_dev+0x1005/0x1410 drivers/mtd/mtd_blkdevs.c:387
 mtdblock_add_mtd+0x184/0x230 drivers/mtd/mtdblock.c:333
 blktrans_notify_add+0x90/0xf0 drivers/mtd/mtd_blkdevs.c:464
 add_mtd_device+0xe01/0x13e0 drivers/mtd/mtdcore.c:693
 mtd_device_parse_register+0xb76/0xd90 drivers/mtd/mtdcore.c:987
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88801d580f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88801d580f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88801d581000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff88801d581080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88801d581100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Crashes (14):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/04/19 13:24 linux-5.15.y c52b9710c83d af24b050 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan KASAN: use-after-free Write in txEnd
2024/04/11 21:29 linux-5.15.y cdfd0a7f0139 95ed9ece .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 KASAN: use-after-free Write in txEnd
2024/02/14 01:52 linux-5.15.y 6139f2a02fe0 e66542d7 .config console log report syz [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan KASAN: use-after-free Write in txEnd
2024/04/20 16:58 linux-5.15.y c52b9710c83d af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: use-after-free Write in txEnd
2024/04/19 12:46 linux-5.15.y c52b9710c83d af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: use-after-free Write in txEnd
2024/04/19 12:44 linux-5.15.y c52b9710c83d af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: use-after-free Write in txEnd
2024/04/17 15:11 linux-5.15.y c52b9710c83d acc528cb .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: use-after-free Write in txEnd
2024/04/15 13:40 linux-5.15.y fa3df276cd36 b9af7e61 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: use-after-free Write in txEnd
2024/04/12 05:30 linux-5.15.y cdfd0a7f0139 27de0a5c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: use-after-free Write in txEnd
2024/04/08 13:47 linux-5.15.y 9465fef4ae35 53df08b6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: use-after-free Write in txEnd
2024/04/17 14:44 linux-5.15.y c52b9710c83d acc528cb .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: use-after-free Write in txEnd
2024/04/11 14:16 linux-5.15.y cdfd0a7f0139 95ed9ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: use-after-free Write in txEnd
2024/04/09 20:44 linux-5.15.y 9465fef4ae35 171ec371 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: use-after-free Write in txEnd
2024/02/22 22:01 linux-5.15.y 6139f2a02fe0 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: use-after-free Write in txEnd
* Struck through repros no longer work on HEAD.