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List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:811:b0:659:9a49:90c5 with SMTP id 006d021491bc7-6599a977508mr2915965eaf.68.1765172966181; Sun, 07 Dec 2025 21:49:26 -0800 (PST) Date: Sun, 07 Dec 2025 21:49:26 -0800 In-Reply-To: <67256f23.050a0220.35b515.017e.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <693666e6.a70a0220.38f243.0088.GAE@google.com> Subject: Re: [syzbot] [block?] general protection fault in blk_update_request From: syzbot To: axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: ba65a4e7120a Merge tag 'clk-for-linus' of git://git.kernel.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10c6aeb4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=8750900a7c493a0b dashboard link: https://syzkaller.appspot.com/bug?extid=1d38eedcb25a3b5686a7 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1584321a580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/0a7549a1a1ed/disk-ba65a4e7.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e00dd3537134/vmlinux-ba65a4e7.xz kernel image: https://storage.googleapis.com/syzbot-assets/30616aa8fe95/bzImage-ba65a4e7.xz mounted in repro #1: https://storage.googleapis.com/syzbot-assets/9cdaa4551a87/mount_0.gz fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=10570a1a580000) mounted in repro #2: https://storage.googleapis.com/syzbot-assets/cf44fc97da6f/mount_1.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+1d38eedcb25a3b5686a7@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-use-after-free in rt_spin_lock+0x88/0x3e0 kernel/locking/spinlock_rt.c:56 Read of size 1 at addr ffff88802d4f0ca8 by task ksoftirqd/0/15 CPU: 0 UID: 0 PID: 15 Comm: ksoftirqd/0 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 __kasan_check_byte+0x2a/0x40 mm/kasan/common.c:573 kasan_check_byte include/linux/kasan.h:401 [inline] lock_acquire+0x84/0x340 kernel/locking/lockdep.c:5842 rt_spin_lock+0x88/0x3e0 kernel/locking/spinlock_rt.c:56 spin_lock include/linux/spinlock_rt.h:44 [inline] __wake_up_common_lock+0x2f/0x1e0 kernel/sched/wait.c:124 blk_update_request+0x57e/0xe60 block/blk-mq.c:1006 blk_mq_end_request+0x3e/0x70 block/blk-mq.c:1168 blk_complete_reqs block/blk-mq.c:1243 [inline] blk_done_softirq+0x10a/0x160 block/blk-mq.c:1248 handle_softirqs+0x226/0x6d0 kernel/softirq.c:622 run_ksoftirqd+0xac/0x210 kernel/softirq.c:1063 smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 Allocated by task 6143: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 poison_kmalloc_redzone mm/kasan/common.c:397 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:414 kasan_kmalloc include/linux/kasan.h:262 [inline] __kmalloc_cache_noprof+0x1fb/0x6d0 mm/slub.c:5771 kmalloc_noprof include/linux/slab.h:957 [inline] lbmLogInit fs/jfs/jfs_logmgr.c:1821 [inline] lmLogInit+0x3d0/0x19e0 fs/jfs/jfs_logmgr.c:1269 open_inline_log fs/jfs/jfs_logmgr.c:1175 [inline] lmLogOpen+0x4e1/0xfa0 fs/jfs/jfs_logmgr.c:1069 jfs_mount_rw+0xe9/0x670 fs/jfs/jfs_mount.c:257 jfs_fill_super+0x754/0xd80 fs/jfs/super.c:532 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1691 vfs_get_tree+0x92/0x2a0 fs/super.c:1751 fc_mount fs/namespace.c:1199 [inline] do_new_mount_fc fs/namespace.c:3636 [inline] do_new_mount+0x302/0xa10 fs/namespace.c:3712 do_mount fs/namespace.c:4035 [inline] __do_sys_mount fs/namespace.c:4224 [inline] __se_sys_mount+0x313/0x410 fs/namespace.c:4201 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 6143: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:252 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284 kasan_slab_free include/linux/kasan.h:234 [inline] slab_free_hook mm/slub.c:2540 [inline] slab_free mm/slub.c:6663 [inline] kfree+0x1bd/0x900 mm/slub.c:6871 lbmLogShutdown fs/jfs/jfs_logmgr.c:1864 [inline] lmLogInit+0x1137/0x19e0 fs/jfs/jfs_logmgr.c:1415 open_inline_log fs/jfs/jfs_logmgr.c:1175 [inline] lmLogOpen+0x4e1/0xfa0 fs/jfs/jfs_logmgr.c:1069 jfs_mount_rw+0xe9/0x670 fs/jfs/jfs_mount.c:257 jfs_fill_super+0x754/0xd80 fs/jfs/super.c:532 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1691 vfs_get_tree+0x92/0x2a0 fs/super.c:1751 fc_mount fs/namespace.c:1199 [inline] do_new_mount_fc fs/namespace.c:3636 [inline] do_new_mount+0x302/0xa10 fs/namespace.c:3712 do_mount fs/namespace.c:4035 [inline] __do_sys_mount fs/namespace.c:4224 [inline] __se_sys_mount+0x313/0x410 fs/namespace.c:4201 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88802d4f0c00 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 168 bytes inside of freed 256-byte region [ffff88802d4f0c00, ffff88802d4f0d00) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2d4f0 head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x80000000000040(head|node=0|zone=1) page_type: f5(slab) raw: 0080000000000040 ffff88813ff26b40 ffffea00009c2900 dead000000000004 raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 head: 0080000000000040 ffff88813ff26b40 ffffea00009c2900 dead000000000004 head: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 head: 0080000000000001 ffffea0000b53c01 00000000ffffffff 00000000ffffffff head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000002 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 16081569570, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x234/0x290 mm/page_alloc.c:1846 prep_new_page mm/page_alloc.c:1854 [inline] get_page_from_freelist+0x28c0/0x2960 mm/page_alloc.c:3915 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5210 alloc_pages_mpol+0xd1/0x380 mm/mempolicy.c:2486 alloc_slab_page mm/slub.c:3075 [inline] allocate_slab+0x86/0x3b0 mm/slub.c:3248 new_slab mm/slub.c:3302 [inline] ___slab_alloc+0xb10/0x1400 mm/slub.c:4651 __slab_alloc+0xc6/0x1f0 mm/slub.c:4774 __slab_alloc_node mm/slub.c:4850 [inline] slab_alloc_node mm/slub.c:5246 [inline] __do_kmalloc_node mm/slub.c:5651 [inline] __kvmalloc_node_noprof+0x327/0x940 mm/slub.c:7129 v4l2_ctrl_new+0x9d5/0x1790 drivers/media/v4l2-core/v4l2-ctrls-core.c:2112 v4l2_ctrl_new_std+0x24d/0x2f0 drivers/media/v4l2-core/v4l2-ctrls-core.c:2266 handler_new_ref+0x153/0x9c0 drivers/media/v4l2-core/v4l2-ctrls-core.c:1853 v4l2_ctrl_add_handler+0x19f/0x290 drivers/media/v4l2-core/v4l2-ctrls-core.c:2416 vivid_create_controls+0x2f57/0x3a60 drivers/media/test-drivers/vivid/vivid-ctrls.c:2051 vivid_create_instance drivers/media/test-drivers/vivid/vivid-core.c:1933 [inline] vivid_probe+0x41b5/0x7150 drivers/media/test-drivers/vivid/vivid-core.c:2095 platform_probe+0xf9/0x190 drivers/base/platform.c:1446 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x26d/0xad0 drivers/base/dd.c:659 page_owner free stack trace missing Memory state around the buggy address: ffff88802d4f0b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802d4f0c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88802d4f0c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802d4f0d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802d4f0d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== --- 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.