================================================================== 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+0xbec/0x21a0 kernel/locking/mutex.c:686 Read of size 8 at addr ffff0000d5038108 by task jfsCommit/98 CPU: 0 UID: 0 PID: 98 Comm: jfsCommit Not tainted 6.12.0-syzkaller-g7b1d1d4cfac0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:484 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:377 [inline] print_report+0x198/0x538 mm/kasan/report.c:488 kasan_report+0xd8/0x138 mm/kasan/report.c:601 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 __mutex_waiter_is_first kernel/locking/mutex.c:197 [inline] __mutex_lock_common+0xbec/0x21a0 kernel/locking/mutex.c:686 __mutex_lock kernel/locking/mutex.c:752 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:804 jfs_syncpt+0x30/0x98 fs/jfs/jfs_logmgr.c:1039 txEnd+0x2ec/0x558 fs/jfs/jfs_txnmgr.c:549 txLazyCommit fs/jfs/jfs_txnmgr.c:2684 [inline] jfs_lazycommit+0x4e0/0x9a8 fs/jfs/jfs_txnmgr.c:2733 kthread+0x288/0x310 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 Allocated by task 6478: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:565 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:257 [inline] __kmalloc_cache_noprof+0x244/0x378 mm/slub.c:4295 kmalloc_noprof include/linux/slab.h:878 [inline] kzalloc_noprof include/linux/slab.h:1014 [inline] open_inline_log fs/jfs/jfs_logmgr.c:1159 [inline] lmLogOpen+0x294/0xdb4 fs/jfs/jfs_logmgr.c:1069 jfs_mount_rw+0xe4/0x5b8 fs/jfs/jfs_mount.c:257 jfs_fill_super+0x4f0/0x9f0 fs/jfs/super.c:565 mount_bdev+0x1d4/0x2a0 fs/super.c:1693 jfs_do_mount+0x44/0x58 fs/jfs/super.c:670 legacy_get_tree+0xd4/0x16c fs/fs_context.c:662 vfs_get_tree+0x90/0x28c fs/super.c:1814 do_new_mount+0x278/0x900 fs/namespace.c:3507 path_mount+0x590/0xe04 fs/namespace.c:3834 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4057 [inline] __se_sys_mount fs/namespace.c:4034 [inline] __arm64_sys_mount+0x4d4/0x5ac fs/namespace.c:4034 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Freed by task 6415: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_free_info+0x54/0x6c mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x64/0x8c mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:2342 [inline] slab_free mm/slub.c:4579 [inline] kfree+0x184/0x47c mm/slub.c:4727 lmLogClose+0x270/0x4d4 jfs_umount+0x274/0x360 fs/jfs/jfs_umount.c:114 jfs_put_super+0x90/0x188 fs/jfs/super.c:194 generic_shutdown_super+0x12c/0x2bc fs/super.c:642 kill_block_super+0x44/0x90 fs/super.c:1710 deactivate_locked_super+0xc4/0x12c fs/super.c:473 deactivate_super+0xe0/0x100 fs/super.c:506 cleanup_mnt+0x34c/0x3dc fs/namespace.c:1373 __cleanup_mnt+0x20/0x30 fs/namespace.c:1380 task_work_run+0x230/0x2e0 kernel/task_work.c:239 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] do_notify_resume+0x178/0x1f4 arch/arm64/kernel/entry-common.c:151 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline] el0_svc+0xac/0x168 arch/arm64/kernel/entry-common.c:745 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 The buggy address belongs to the object at ffff0000d5038000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 264 bytes inside of freed 1024-byte region [ffff0000d5038000, ffff0000d5038400) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000d503f800 pfn:0x115038 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000040 ffff0000c0001dc0 fffffdffc3533600 0000000000000002 raw: ffff0000d503f800 000000008010000f 00000001f5000000 0000000000000000 head: 05ffc00000000040 ffff0000c0001dc0 fffffdffc3533600 0000000000000002 head: ffff0000d503f800 000000008010000f 00000001f5000000 0000000000000000 head: 05ffc00000000003 fffffdffc3540e01 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d5038000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d5038080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000d5038100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000d5038180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d5038200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== Unable to handle kernel paging request at virtual address dfff800000000006 KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] Mem abort info: ESR = 0x0000000096000005 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x05: level 1 translation fault Data abort info: ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [dfff800000000006] address between user and kernel address ranges Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP Modules linked in: CPU: 0 UID: 0 PID: 98 Comm: jfsCommit Tainted: G B 6.12.0-syzkaller-g7b1d1d4cfac0 #0 Tainted: [B]=BAD_PAGE Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 pstate: 20400005 (nzCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : write_special_inodes fs/jfs/jfs_logmgr.c:207 [inline] pc : lmLogSync+0xec/0x978 fs/jfs/jfs_logmgr.c:935 lr : write_special_inodes fs/jfs/jfs_logmgr.c:207 [inline] lr : lmLogSync+0xe0/0x978 fs/jfs/jfs_logmgr.c:935 sp : ffff80009b5f7b20 x29: ffff80009b5f7bf0 x28: ffff80009af2c000 x27: dfff800000000000 x26: dfff800000000000 x25: ffff80009b5f7b40 x24: 1ffff00011fbf954 x23: 0000000000000002 x22: 0000000000000006 x21: 0000000000000030 x20: ffff0000d5f6dc98 x19: ffff0000d5038000 x18: 1fffe000366c6876 x17: ffff80008f81d000 x16: ffff80008b3edfc8 x15: ffff7000136bef70 x14: 1ffff000136bef6d x13: 0000000000000004 x12: ffffffffffffffff x11: ffff7000136bef70 x10: 0000000000ff0100 x9 : ffff8000973ac3a0 x8 : 0000000000000006 x7 : 0000000000000000 x6 : ffff8000802c419c x5 : 0000000000000000 x4 : 0000000000000004 x3 : ffff800081b3b7b8 x2 : 0000000000000000 x1 : 0000000000000008 x0 : 0000000000000000 Call trace: write_special_inodes fs/jfs/jfs_logmgr.c:207 [inline] (P) lmLogSync+0xec/0x978 fs/jfs/jfs_logmgr.c:935 (P) write_special_inodes fs/jfs/jfs_logmgr.c:207 [inline] (L) lmLogSync+0xe0/0x978 fs/jfs/jfs_logmgr.c:935 (L) jfs_syncpt+0x74/0x98 fs/jfs/jfs_logmgr.c:1041 txEnd+0x2ec/0x558 fs/jfs/jfs_txnmgr.c:549 txLazyCommit fs/jfs/jfs_txnmgr.c:2684 [inline] jfs_lazycommit+0x4e0/0x9a8 fs/jfs/jfs_txnmgr.c:2733 kthread+0x288/0x310 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 Code: 97be39c2 f94002a8 9100c115 d343fea8 (387b6908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 97be39c2 bl 0xfffffffffef8e708 4: f94002a8 ldr x8, [x21] 8: 9100c115 add x21, x8, #0x30 c: d343fea8 lsr x8, x21, #3 * 10: 387b6908 ldrb w8, [x8, x27] <-- trapping instruction