================================================================== BUG: KASAN: use-after-free in __mutex_waiter_is_first kernel/locking/mutex.c:197 [inline] BUG: KASAN: use-after-free in __mutex_lock_common+0xbec/0x21a0 kernel/locking/mutex.c:681 Read of size 8 at addr ffff0000d642c908 by task jfsCommit/92 CPU: 0 PID: 92 Comm: jfsCommit Not tainted 6.1.134-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0x174/0x4c0 mm/kasan/report.c:427 kasan_report+0xd4/0x130 mm/kasan/report.c:531 __asan_report_load8_noabort+0x2c/0x38 mm/kasan/report_generic.c:351 __mutex_waiter_is_first kernel/locking/mutex.c:197 [inline] __mutex_lock_common+0xbec/0x21a0 kernel/locking/mutex.c:681 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 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+0x4c4/0x988 fs/jfs/jfs_txnmgr.c:2732 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864 Allocated by task 4453: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] kmalloc_trace+0x7c/0x94 mm/slab_common.c:1031 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] open_inline_log fs/jfs/jfs_logmgr.c:1159 [inline] lmLogOpen+0x290/0xdb0 fs/jfs/jfs_logmgr.c:1069 jfs_mount_rw+0xe4/0x57c fs/jfs/jfs_mount.c:253 jfs_fill_super+0x4f0/0x9f0 fs/jfs/super.c:565 mount_bdev+0x274/0x370 fs/super.c:1443 jfs_do_mount+0x44/0x58 fs/jfs/super.c:670 legacy_get_tree+0xd4/0x16c fs/fs_context.c:632 vfs_get_tree+0x90/0x274 fs/super.c:1573 do_new_mount+0x278/0x8fc fs/namespace.c:3056 path_mount+0x590/0xe5c fs/namespace.c:3386 do_mount fs/namespace.c:3399 [inline] __do_sys_mount fs/namespace.c:3607 [inline] __se_sys_mount fs/namespace.c:3584 [inline] __arm64_sys_mount+0x498/0x588 fs/namespace.c:3584 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Freed by task 4291: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:516 ____kasan_slab_free+0x144/0x1c0 mm/kasan/common.c:236 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:244 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook mm/slub.c:1750 [inline] slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0x2c0/0x4b4 mm/slub.c:3674 kfree+0xcc/0x1b8 mm/slab_common.c:988 lmLogClose+0x270/0x4d8 fs/jfs/jfs_logmgr.c:-1 jfs_umount+0x24c/0x338 fs/jfs/jfs_umount.c:116 jfs_put_super+0x90/0x188 fs/jfs/super.c:194 generic_shutdown_super+0x130/0x328 fs/super.c:501 kill_block_super+0x70/0xdc fs/super.c:1470 deactivate_locked_super+0xac/0x124 fs/super.c:332 deactivate_super+0xf0/0x110 fs/super.c:363 cleanup_mnt+0x394/0x41c fs/namespace.c:1186 __cleanup_mnt+0x20/0x30 fs/namespace.c:1193 task_work_run+0x240/0x2f0 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x2080/0x2cb8 arch/arm64/kernel/signal.c:1132 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x9c/0x168 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Last potentially related work creation: kasan_save_stack+0x40/0x70 mm/kasan/common.c:45 __kasan_record_aux_stack+0xcc/0xe8 mm/kasan/generic.c:486 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496 kvfree_call_rcu+0xb4/0x714 kernel/rcu/tree.c:3401 net_assign_generic net/core/net_namespace.c:117 [inline] ops_init+0x2a0/0x53c net/core/net_namespace.c:132 __register_pernet_operations net/core/net_namespace.c:1209 [inline] register_pernet_operations+0x264/0x574 net/core/net_namespace.c:1282 register_pernet_subsys+0x38/0x58 net/core/net_namespace.c:1323 xfrm6_tunnel_init+0x48/0x144 net/ipv6/xfrm6_tunnel.c:364 do_one_initcall+0x260/0xacc init/main.c:1298 do_initcall_level+0x154/0x214 init/main.c:1371 do_initcalls+0x58/0xac init/main.c:1387 do_basic_setup+0x8c/0xa0 init/main.c:1406 kernel_init_freeable+0x3a4/0x528 init/main.c:1626 kernel_init+0x24/0x29c init/main.c:1514 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864 The buggy address belongs to the object at ffff0000d642c800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 264 bytes inside of 1024-byte region [ffff0000d642c800, ffff0000d642cc00) The buggy address belongs to the physical page: page:00000000b393cc17 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x116428 head:00000000b393cc17 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 fffffc00035a9c00 dead000000000003 ffff0000c0002780 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d642c800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d642c880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000d642c900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000d642c980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d642ca00: 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 = 0x0000000096000006 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x06: level 2 translation fault Data abort info: ISV = 0, ISS = 0x00000006 CM = 0, WnR = 0 [dfff800000000006] address between user and kernel address ranges Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 92 Comm: jfsCommit Tainted: G B 6.1.134-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 pstate: 00400005 (nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : write_special_inodes fs/jfs/jfs_logmgr.c:207 [inline] pc : lmLogSync+0xf0/0x97c fs/jfs/jfs_logmgr.c:935 lr : write_special_inodes fs/jfs/jfs_logmgr.c:207 [inline] lr : lmLogSync+0xe4/0x97c fs/jfs/jfs_logmgr.c:935 sp : ffff80001d8f7b20 x29: ffff80001d8f7bf0 x28: ffff800020902000 x27: dfff800000000000 x26: dfff800000000000 x25: 0000000000000001 x24: 1ffff00002c1572c x23: 0000000000000002 x22: 0000000000000030 x21: ffff80001d8f7b60 x20: ffff0000cb17c000 x19: ffff0000d642c800 x18: 1fffe00036798976 x17: ffff800015aed000 x16: ffff80001226b7c0 x15: ffff0001b3cc4bbc x14: ffff0001b3cc4bb8 x13: ffff700003b1ef68 x12: ffff700003b1ef70 x11: 0000000000ff0100 x10: 0000000000000000 x9 : ffff80001cd769d0 x8 : 0000000000000006 x7 : 0000000000000000 x6 : ffff800008279464 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff800009a52878 x2 : 0000000000000000 x1 : 0000000000000008 x0 : 0000000000000000 Call trace: write_special_inodes fs/jfs/jfs_logmgr.c:207 [inline] lmLogSync+0xf0/0x97c fs/jfs/jfs_logmgr.c:935 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+0x4c4/0x988 fs/jfs/jfs_txnmgr.c:2732 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864 Code: 97bc8903 f94002c8 9100c116 d343fec8 (387b6908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 97bc8903 bl 0xfffffffffef2240c 4: f94002c8 ldr x8, [x22] 8: 9100c116 add x22, x8, #0x30 c: d343fec8 lsr x8, x22, #3 * 10: 387b6908 ldrb w8, [x8, x27] <-- trapping instruction