Hello, syzbot found the following issue on: HEAD commit: 021533194476 Kconfig: Disable -Wstringop-overflow for GCC .. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1674acffe80000 kernel config: https://syzkaller.appspot.com/x/.config?x=f204e0b6490f4419 dashboard link: https://syzkaller.appspot.com/bug?extid=c244f4a09ca85dd2ebc1 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: https://storage.googleapis.com/syzbot-assets/3c5d4d2f86e3/disk-02153319.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/b16ab56fc47a/vmlinux-02153319.xz kernel image: https://storage.googleapis.com/syzbot-assets/07a8e67be96d/bzImage-02153319.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c244f4a09ca85dd2ebc1@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KASAN: slab-use-after-free in __mutex_waiter_is_first kernel/locking/mutex.c:197 [inline] BUG: KASAN: slab-use-after-free in __mutex_lock_common kernel/locking/mutex.c:686 [inline] BUG: KASAN: slab-use-after-free in __mutex_lock+0x6bc/0xd70 kernel/locking/mutex.c:752 Read of size 8 at addr ffff88807bc26108 by task jfsCommit/109 CPU: 0 PID: 109 Comm: jfsCommit Not tainted 6.8.0-rc2-syzkaller-00199-g021533194476 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0x167/0x540 mm/kasan/report.c:488 kasan_report+0x142/0x180 mm/kasan/report.c:601 __mutex_waiter_is_first kernel/locking/mutex.c:197 [inline] __mutex_lock_common kernel/locking/mutex.c:686 [inline] __mutex_lock+0x6bc/0xd70 kernel/locking/mutex.c:752 jfs_syncpt+0x26/0xa0 fs/jfs/jfs_logmgr.c:1039 txEnd+0x30f/0x560 fs/jfs/jfs_txnmgr.c:549 txLazyCommit fs/jfs/jfs_txnmgr.c:2684 [inline] jfs_lazycommit+0x619/0xb70 fs/jfs/jfs_txnmgr.c:2733 kthread+0x2ef/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242 </TASK> Allocated by task 9990: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:372 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:389 kasan_kmalloc include/linux/kasan.h:211 [inline] kmalloc_trace+0x1d6/0x360 mm/slub.c:4012 kmalloc include/linux/slab.h:590 [inline] kzalloc include/linux/slab.h:711 [inline] open_inline_log fs/jfs/jfs_logmgr.c:1159 [inline] lmLogOpen+0x335/0x1050 fs/jfs/jfs_logmgr.c:1069 jfs_mount_rw+0xf1/0x6a0 fs/jfs/jfs_mount.c:257 jfs_fill_super+0x681/0xc50 fs/jfs/super.c:565 mount_bdev+0x20a/0x2d0 fs/super.c:1663 legacy_get_tree+0xee/0x190 fs/fs_context.c:662 vfs_get_tree+0x90/0x2a0 fs/super.c:1784 do_new_mount+0x2be/0xb40 fs/namespace.c:3352 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 Freed by task 9990: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x4e/0x60 mm/kasan/generic.c:640 poison_slab_object+0xa6/0xe0 mm/kasan/common.c:241 __kasan_slab_free+0x34/0x70 mm/kasan/common.c:257 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2121 [inline] slab_free mm/slub.c:4299 [inline] kfree+0x14a/0x380 mm/slub.c:4409 lmLogClose+0x2a1/0x530 jfs_remount+0x435/0x6b0 fs/jfs/super.c:466 reconfigure_super+0x445/0x880 fs/super.c:1076 do_remount fs/namespace.c:2892 [inline] path_mount+0xc28/0xfa0 fs/namespace.c:3671 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 The buggy address belongs to the object at ffff88807bc26000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 264 bytes inside of freed 1024-byte region [ffff88807bc26000, ffff88807bc26400) The buggy address belongs to the physical page: page:ffffea0001ef0800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7bc20 head:ffffea0001ef0800 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 ksm flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888014c41dc0 ffffea0001e53000 dead000000000003 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 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5137, tgid 5137 (kworker/0:5), ts 122851474325, free_ts 122848490685 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0x33ea/0x3580 mm/page_alloc.c:3311 __alloc_pages+0x255/0x680 mm/page_alloc.c:4567 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page+0x5f/0x160 mm/slub.c:2190 allocate_slab mm/slub.c:2354 [inline] new_slab+0x84/0x2f0 mm/slub.c:2407 ___slab_alloc+0xd17/0x13e0 mm/slub.c:3540 __slab_alloc mm/slub.c:3625 [inline] __slab_alloc_node mm/slub.c:3678 [inline] slab_alloc_node mm/slub.c:3850 [inline] __do_kmalloc_node mm/slub.c:3980 [inline] __kmalloc_node_track_caller+0x2d1/0x4e0 mm/slub.c:4001 kmalloc_reserve+0xf3/0x260 net/core/skbuff.c:582 __alloc_skb+0x1b1/0x420 net/core/skbuff.c:651 alloc_skb include/linux/skbuff.h:1296 [inline] nlmsg_new include/net/netlink.h:1010 [inline] inet6_rt_notify+0xdf/0x290 net/ipv6/route.c:6171 fib6_add_rt2node net/ipv6/ip6_fib.c:1251 [inline] fib6_add+0x1dc4/0x3d50 net/ipv6/ip6_fib.c:1477 __ip6_ins_rt net/ipv6/route.c:1303 [inline] ip6_route_add+0x88/0x120 net/ipv6/route.c:3847 addrconf_add_mroute net/ipv6/addrconf.c:2501 [inline] addrconf_add_dev+0x35b/0x540 net/ipv6/addrconf.c:2519 addrconf_dev_config net/ipv6/addrconf.c:3423 [inline] addrconf_init_auto_addrs+0x85f/0xeb0 net/ipv6/addrconf.c:3510 addrconf_notify+0xaff/0x1020 net/ipv6/addrconf.c:3683 notifier_call_chain+0x18f/0x3b0 kernel/notifier.c:93 page last free pid 5138 tgid 5138 stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1140 [inline] free_unref_page_prepare+0x95d/0xa80 mm/page_alloc.c:2346 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2486 discard_slab mm/slub.c:2453 [inline] __put_partials+0xeb/0x130 mm/slub.c:2922 put_cpu_partial+0x17b/0x250 mm/slub.c:2997 __slab_free+0x302/0x410 mm/slub.c:4166 qlink_free mm/kasan/quarantine.c:160 [inline] qlist_free_all+0x6d/0xd0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:324 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3813 [inline] slab_alloc_node mm/slub.c:3860 [inline] kmem_cache_alloc_node+0x18f/0x380 mm/slub.c:3903 __alloc_skb+0x181/0x420 net/core/skbuff.c:641 alloc_skb include/linux/skbuff.h:1296 [inline] alloc_skb_with_frags+0xc3/0x780 net/core/skbuff.c:6394 sock_alloc_send_pskb+0x919/0xa60 net/core/sock.c:2784 sock_alloc_send_skb include/net/sock.h:1855 [inline] mld_newpack+0x1c3/0xa90 net/ipv6/mcast.c:1746 add_grhead net/ipv6/mcast.c:1849 [inline] add_grec+0x1492/0x19a0 net/ipv6/mcast.c:1987 mld_send_initial_cr+0xed/0x240 net/ipv6/mcast.c:2233 mld_dad_work+0x45/0x270 net/ipv6/mcast.c:2259 Memory state around the buggy address: ffff88807bc26000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807bc26080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807bc26100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807bc26180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807bc26200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- 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@xxxxxxxxxxxxxxxx. 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
