================================================================== 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+0xae8/0x1f38 kernel/locking/mutex.c:681 Read of size 8 at addr ffff0000d9c3c908 by task jfsCommit/92 CPU: 0 PID: 92 Comm: jfsCommit Not tainted 6.1.144-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 print_address_description+0x88/0x220 mm/kasan/report.c:316 print_report+0x50/0x68 mm/kasan/report.c:427 kasan_report+0xa8/0x100 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+0xae8/0x1f38 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+0x2c/0x94 fs/jfs/jfs_logmgr.c:1039 txEnd+0x290/0x4f0 fs/jfs/jfs_txnmgr.c:549 txLazyCommit fs/jfs/jfs_txnmgr.c:2684 [inline] jfs_lazycommit+0x498/0x918 fs/jfs/jfs_txnmgr.c:2732 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:849 Allocated by task 7724: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_alloc_info+0x28/0x34 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xa0/0xb8 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+0x288/0xd58 fs/jfs/jfs_logmgr.c:1069 jfs_mount_rw+0xe4/0x50c fs/jfs/jfs_mount.c:253 jfs_fill_super+0x484/0x948 fs/jfs/super.c:565 mount_bdev+0x264/0x358 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+0x228/0x810 fs/namespace.c:3058 path_mount+0x5b4/0xe78 fs/namespace.c:3388 do_mount fs/namespace.c:3401 [inline] __do_sys_mount fs/namespace.c:3609 [inline] __se_sys_mount fs/namespace.c:3586 [inline] __arm64_sys_mount+0x49c/0x584 fs/namespace.c:3586 __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+0x58/0x138 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 4306: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_free_info+0x3c/0x60 mm/kasan/generic.c:516 ____kasan_slab_free+0x148/0x1b0 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+0x16c/0x1ec mm/slub.c:1750 slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0xc0/0x224 mm/slub.c:3674 kfree+0xd0/0x1ac mm/slab_common.c:988 lmLogClose+0x250/0x4c8 fs/jfs/jfs_logmgr.c:-1 jfs_umount+0x244/0x328 fs/jfs/jfs_umount.c:116 jfs_put_super+0x90/0x188 fs/jfs/super.c:194 generic_shutdown_super+0x130/0x324 fs/super.c:501 kill_block_super+0x70/0xdc fs/super.c:1470 deactivate_locked_super+0xac/0x124 fs/super.c:332 deactivate_super+0xe8/0x108 fs/super.c:363 cleanup_mnt+0x37c/0x404 fs/namespace.c:1182 __cleanup_mnt+0x20/0x30 fs/namespace.c:1189 task_work_run+0x1ec/0x270 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x1f70/0x2b0c arch/arm64/kernel/signal.c:1137 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+0x98/0x138 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+0xc0/0xdc mm/kasan/generic.c:486 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496 call_rcu+0x100/0x954 kernel/rcu/tree.c:2849 sctp_transport_destroy net/sctp/transport.c:173 [inline] sctp_transport_put+0xf0/0x174 net/sctp/transport.c:486 sctp_transport_free+0x140/0x158 net/sctp/transport.c:144 sctp_association_free+0x5c0/0x6e0 net/sctp/associola.c:382 sctp_cmd_delete_tcb net/sctp/sm_sideeffect.c:944 [inline] sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1331 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1199 [inline] sctp_do_sm+0x2ce0/0x4894 net/sctp/sm_sideeffect.c:1170 sctp_endpoint_bh_rcv+0x498/0x69c net/sctp/endpointola.c:402 sctp_inq_push+0x190/0x1b4 net/sctp/inqueue.c:88 sctp_rcv+0x1ad0/0x21cc net/sctp/input.c:258 sctp6_rcv+0x4c/0x80 net/sctp/ipv6.c:1109 ip6_protocol_deliver_rcu+0x928/0x11d0 net/ipv6/ip6_input.c:438 ip6_input_finish+0x164/0x298 net/ipv6/ip6_input.c:483 NF_HOOK+0x2c4/0x358 include/linux/netfilter.h:302 ip6_input+0x90/0xa8 net/ipv6/ip6_input.c:492 dst_input include/net/dst.h:463 [inline] ip6_rcv_finish+0x1f4/0x220 net/ipv6/ip6_input.c:79 NF_HOOK+0x2c4/0x358 include/linux/netfilter.h:302 ipv6_rcv+0x9c/0xbc net/ipv6/ip6_input.c:310 __netif_receive_skb_one_core net/core/dev.c:5569 [inline] __netif_receive_skb+0xcc/0x2ac net/core/dev.c:5683 process_backlog+0x408/0x714 net/core/dev.c:6011 __napi_poll+0xb4/0x3f0 net/core/dev.c:6578 napi_poll net/core/dev.c:6645 [inline] net_rx_action+0x50c/0xb10 net/core/dev.c:6759 handle_softirqs+0x318/0xc6c kernel/softirq.c:596 __do_softirq+0x14/0x20 kernel/softirq.c:630 The buggy address belongs to the object at ffff0000d9c3c800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 264 bytes inside of 1024-byte region [ffff0000d9c3c800, ffff0000d9c3cc00) The buggy address belongs to the physical page: page:00000000f619f661 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x119c38 head:00000000f619f661 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 0000000000000000 dead000000000001 ffff0000c0002780 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d9c3c800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d9c3c880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000d9c3c900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000d9c3c980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d9c3ca00: 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 6.1.144-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 pstate: 00400005 (nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : write_special_inodes fs/jfs/jfs_logmgr.c:207 [inline] pc : lmLogSync+0xf8/0x894 fs/jfs/jfs_logmgr.c:935 lr : write_special_inodes fs/jfs/jfs_logmgr.c:207 [inline] lr : lmLogSync+0xec/0x894 fs/jfs/jfs_logmgr.c:935 sp : ffff8000203e7b60 x29: ffff8000203e7c30 x28: 1ffff00003fa3222 x27: dfff800000000000 x26: 1ffff00002accdcc x25: dfff800000000000 x24: ffff8000203e7b80 x23: 0000000000000002 x22: ffff70000407cf70 x21: 0000000000000030 x20: ffff0000e8b4bd90 x19: ffff0000d9c3c800 x18: ffff800011aabce0 x17: 1fffe00033ed9d7e x16: ffff800008042c60 x15: ffff8000150ad000 x14: 0000000000000100 x13: 0000000000000120 x12: 0000000000ff0100 x11: ff00800009892bbc x10: 0000000000000000 x9 : ffff80001c3139d0 x8 : 0000000000000006 x7 : 0000000000000000 x6 : ffff80000a88e23c x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff800009892c08 x2 : 0000000000000000 x1 : 0000000000000008 x0 : 0000000000000000 Call trace: write_special_inodes fs/jfs/jfs_logmgr.c:207 [inline] lmLogSync+0xf8/0x894 fs/jfs/jfs_logmgr.c:935 jfs_syncpt+0x70/0x94 fs/jfs/jfs_logmgr.c:1041 txEnd+0x290/0x4f0 fs/jfs/jfs_txnmgr.c:549 txLazyCommit fs/jfs/jfs_txnmgr.c:2684 [inline] jfs_lazycommit+0x498/0x918 fs/jfs/jfs_txnmgr.c:2732 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:849 Code: 97c10e58 f94002a8 9100c115 d343fea8 (387b6908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 97c10e58 bl 0xffffffffff043960 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