syzbot has found a reproducer for the following issue on: HEAD commit: ec35307e18ba Merge tag 'drm-fixes-2023-02-17' of git://ano.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=136bc2f0c80000 kernel config: https://syzkaller.appspot.com/x/.config?x=f4b0f5dd9aee9645 dashboard link: https://syzkaller.appspot.com/bug?extid=6a93efb725385bc4b2e9 compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16782d80c80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/5680df3ffb85/disk-ec35307e.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/6bdf250f8996/vmlinux-ec35307e.xz kernel image: https://storage.googleapis.com/syzbot-assets/5855b843bfdd/bzImage-ec35307e.xz mounted in repro #1: https://storage.googleapis.com/syzbot-assets/7c16d31db3c2/mount_0.gz mounted in repro #2: https://storage.googleapis.com/syzbot-assets/7cb46f599e58/mount_5.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6a93efb725385bc4b2e9@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KASAN: double-free in dbUnmount+0xf8/0x110 fs/jfs/jfs_dmap.c:264 Free of addr ffff888070065000 by task syz-executor.2/5106 CPU: 0 PID: 5106 Comm: syz-executor.2 Not tainted 6.2.0-rc8-syzkaller-00098-gec35307e18ba #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:306 [inline] print_report+0x163/0x4f0 mm/kasan/report.c:417 kasan_report_invalid_free+0x110/0x130 mm/kasan/report.c:482 ____kasan_slab_free+0xfb/0x120 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook mm/slub.c:1807 [inline] slab_free mm/slub.c:3787 [inline] __kmem_cache_free+0x264/0x3c0 mm/slub.c:3800 dbUnmount+0xf8/0x110 fs/jfs/jfs_dmap.c:264 jfs_umount+0x238/0x3a0 fs/jfs/jfs_umount.c:87 jfs_put_super+0x8a/0x190 fs/jfs/super.c:194 generic_shutdown_super+0x134/0x310 fs/super.c:492 kill_block_super+0x7e/0xe0 fs/super.c:1386 deactivate_locked_super+0xa4/0x110 fs/super.c:332 cleanup_mnt+0x490/0x520 fs/namespace.c:1291 task_work_run+0x24a/0x300 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xd9/0x100 kernel/entry/common.c:171 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x64/0x2e0 kernel/entry/common.c:296 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f2586c8d567 Code: ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffcc1f3b418 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f2586c8d567 RDX: 00007ffcc1f3b4ea RSI: 000000000000000a RDI: 00007ffcc1f3b4e0 RBP: 00007ffcc1f3b4e0 R08: 00000000ffffffff R09: 00007ffcc1f3b2b0 R10: 00005555571d08b3 R11: 0000000000000246 R12: 00007f2586ce6b24 R13: 00007ffcc1f3c5a0 R14: 00005555571d0810 R15: 00007ffcc1f3c5e0 </TASK> Allocated by task 6074: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x80 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x9b/0xb0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:580 [inline] dbMount+0x58/0x9a0 fs/jfs/jfs_dmap.c:164 jfs_mount+0x1e5/0x830 fs/jfs/jfs_mount.c:121 jfs_fill_super+0x59c/0xc50 fs/jfs/super.c:556 mount_bdev+0x271/0x3a0 fs/super.c:1359 legacy_get_tree+0xef/0x190 fs/fs_context.c:610 vfs_get_tree+0x8c/0x270 fs/super.c:1489 do_new_mount+0x28f/0xae0 fs/namespace.c:3145 do_mount fs/namespace.c:3488 [inline] __do_sys_mount fs/namespace.c:3697 [inline] __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3674 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 6095: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x80 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:523 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook mm/slub.c:1807 [inline] slab_free mm/slub.c:3787 [inline] __kmem_cache_free+0x264/0x3c0 mm/slub.c:3800 dbUnmount+0xf8/0x110 fs/jfs/jfs_dmap.c:264 jfs_mount_rw+0x4ac/0x6a0 fs/jfs/jfs_mount.c:247 jfs_remount+0x3d1/0x6b0 fs/jfs/super.c:454 reconfigure_super+0x3c9/0x7c0 fs/super.c:935 vfs_fsconfig_locked fs/fsopen.c:254 [inline] __do_sys_fsconfig fs/fsopen.c:439 [inline] __se_sys_fsconfig+0xa29/0xf70 fs/fsopen.c:314 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff888070065000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 0 bytes inside of 2048-byte region [ffff888070065000, ffff888070065800) The buggy address belongs to the physical page: page:ffffea0001c01800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x70060 head:ffffea0001c01800 order:3 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0 anon flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff888012442000 0000000000000000 dead000000000001 raw: 0000000000000000 0000000080080008 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 5107, tgid 5107 (syz-executor.4), ts 445079557996, free_ts 18734675106 prep_new_page mm/page_alloc.c:2531 [inline] get_page_from_freelist+0x3449/0x35c0 mm/page_alloc.c:4283 __alloc_pages+0x291/0x7e0 mm/page_alloc.c:5549 alloc_slab_page+0x6a/0x160 mm/slub.c:1851 allocate_slab mm/slub.c:1998 [inline] new_slab+0x84/0x2f0 mm/slub.c:2051 ___slab_alloc+0xa85/0x10a0 mm/slub.c:3193 __slab_alloc mm/slub.c:3292 [inline] __slab_alloc_node mm/slub.c:3345 [inline] slab_alloc_node mm/slub.c:3442 [inline] __kmem_cache_alloc_node+0x1b8/0x2a0 mm/slub.c:3491 kmalloc_trace+0x2a/0x60 mm/slab_common.c:1062 kmalloc include/linux/slab.h:580 [inline] kzalloc include/linux/slab.h:720 [inline] nsim_fib_create+0xa8/0xbb0 drivers/net/netdevsim/fib.c:1558 nsim_drv_probe+0x6ed/0xb30 drivers/net/netdevsim/dev.c:1581 really_probe+0x2ab/0xcd0 drivers/base/dd.c:639 __driver_probe_device+0x1c3/0x3f0 drivers/base/dd.c:778 driver_probe_device+0x50/0x420 drivers/base/dd.c:808 __device_attach_driver+0x2d3/0x520 drivers/base/dd.c:936 bus_for_each_drv+0x187/0x210 drivers/base/bus.c:427 __device_attach+0x35d/0x580 drivers/base/dd.c:1008 bus_probe_device+0xbe/0x1e0 drivers/base/bus.c:487 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1446 [inline] free_pcp_prepare mm/page_alloc.c:1496 [inline] free_unref_page_prepare+0xf3a/0x1040 mm/page_alloc.c:3369 free_unref_page+0x37/0x3f0 mm/page_alloc.c:3464 free_contig_range+0x9e/0x150 mm/page_alloc.c:9488 destroy_args+0x102/0x9a0 mm/debug_vm_pgtable.c:998 debug_vm_pgtable+0x40a/0x470 mm/debug_vm_pgtable.c:1318 do_one_initcall+0x2c3/0xa60 init/main.c:1306 do_initcall_level+0x157/0x210 init/main.c:1379 do_initcalls+0x3f/0x80 init/main.c:1395 kernel_init_freeable+0x477/0x630 init/main.c:1634 kernel_init+0x1d/0x2a0 init/main.c:1522 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Memory state around the buggy address: ffff888070064f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888070064f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888070065000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888070065080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888070065100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================
