REISERFS warning (device loop0): vs-13060 reiserfs_update_sd_size: stat data of object [2 6 0x0 SD] (nlink == 1) not found (pos 1) REISERFS warning (device loop0): vs-13060 reiserfs_update_sd_size: stat data of object [2 6 0x0 SD] (nlink == 1) not found (pos 1) ================================================================== BUG: KASAN: use-after-free in leaf_paste_in_buffer+0x1dc/0xa40 fs/reiserfs/lbalance.c:1017 Write of size 3936 at addr ffff0000ead79140 by task syz.0.51/4598 CPU: 1 PID: 4598 Comm: syz.0.51 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026 Call trace: dump_backtrace+0x1c4/0x1f0 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+0xf4/0x15c lib/dump_stack.c:106 print_address_description+0x88/0x218 mm/kasan/report.c:316 print_report+0x50/0x68 mm/kasan/report.c:420 kasan_report+0xa8/0xfc mm/kasan/report.c:524 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x258/0x290 mm/kasan/generic.c:189 memmove+0x60/0x90 mm/kasan/shadow.c:55 leaf_paste_in_buffer+0x1dc/0xa40 fs/reiserfs/lbalance.c:1017 leaf_copy_boundary_item+0x928/0x19f4 fs/reiserfs/lbalance.c:199 leaf_copy_items fs/reiserfs/lbalance.c:551 [inline] leaf_move_items+0x6c8/0xbd8 fs/reiserfs/lbalance.c:726 leaf_shift_left+0xc4/0x3ac fs/reiserfs/lbalance.c:750 balance_leaf_paste_left_shift fs/reiserfs/do_balan.c:458 [inline] balance_leaf_paste_left fs/reiserfs/do_balan.c:592 [inline] balance_leaf_left fs/reiserfs/do_balan.c:613 [inline] balance_leaf+0x3db8/0xdee0 fs/reiserfs/do_balan.c:1409 do_balance+0x270/0x794 fs/reiserfs/do_balan.c:1888 reiserfs_paste_into_item+0x640/0x6e8 fs/reiserfs/stree.c:2159 reiserfs_get_block+0x1538/0x3860 fs/reiserfs/inode.c:1069 __block_write_begin_int+0x3d8/0x13c0 fs/buffer.c:1991 __block_write_begin+0x7c/0xa0 fs/buffer.c:2041 reiserfs_write_begin+0x328/0x718 fs/reiserfs/inode.c:2775 generic_perform_write+0x240/0x508 mm/filemap.c:3862 __generic_file_write_iter+0x130/0x250 mm/filemap.c:3960 generic_file_write_iter+0xb4/0x2b0 mm/filemap.c:3989 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x3c8/0x7c8 fs/read_write.c:584 ksys_pwrite64 fs/read_write.c:699 [inline] __do_sys_pwrite64 fs/read_write.c:709 [inline] __se_sys_pwrite64 fs/read_write.c:706 [inline] __arm64_sys_pwrite64+0x178/0x210 fs/read_write.c:706 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 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 The buggy address belongs to the physical page: page:0000000015b43263 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x12ad79 flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000000 fffffc0003ab65c8 fffffc0003ac46c8 0000000000000000 raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000ead79000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff0000ead79080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff0000ead79100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff0000ead79180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff0000ead79200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== ------------[ cut here ]------------ WARNING: CPU: 0 PID: 4598 at include/trace/events/preemptirq.h:38 cpu_max_bits_warn kernel/trace/trace_preemptirq.c:-1 [inline] WARNING: CPU: 0 PID: 4598 at include/trace/events/preemptirq.h:38 cpumask_check include/linux/cpumask.h:117 [inline] WARNING: CPU: 0 PID: 4598 at include/trace/events/preemptirq.h:38 cpumask_test_cpu include/linux/cpumask.h:444 [inline] WARNING: CPU: 0 PID: 4598 at include/trace/events/preemptirq.h:38 cpu_online include/linux/cpumask.h:1030 [inline] WARNING: CPU: 0 PID: 4598 at include/trace/events/preemptirq.h:38 trace_irq_disable include/trace/events/preemptirq.h:36 [inline] WARNING: CPU: 0 PID: 4598 at include/trace/events/preemptirq.h:38 trace_hardirqs_off_finish+0x214/0x48c kernel/trace/trace_preemptirq.c:67 Modules linked in: CPU: 0 PID: 4598 Comm: syz.0.51 Tainted: G B D W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026 pstate: 224000c5 (nzCv daIF +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : trace_irq_disable kernel/trace/trace_preemptirq.c:-1 [inline] pc : trace_hardirqs_off_finish+0x214/0x48c kernel/trace/trace_preemptirq.c:67 lr : trace_irq_disable include/trace/events/preemptirq.h:36 [inline] lr : trace_hardirqs_off_finish+0x1d8/0x48c kernel/trace/trace_preemptirq.c:67 sp : ffff800021f26320 x29: ffff800021f26320 x28: ffff0000cb205400 x27: 0000000000000000 x26: dfff800000000000 x25: ffff0000ead7a02d x24: ffff8000152e2968 x23: 1fffe00019640a81 x22: dfff800000000000 x21: ffff00019f3c0968 x20: 0000000000000000 x19: ffff80001537d160 x18: 1fffe00033e7697e x17: 0000000000000000 x16: ffff800011b90080 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000 x11: ff0080000a975d20 x10: 0000000000000003 x9 : ffff8000152e42f0 x8 : 0000000100000000 x7 : 0000000000000000 x6 : 0000000000000000 x5 : ffff0000ead7af90 x4 : ffff0000ead7b000 x3 : 0000000000000000 x2 : ffff800021f262c0 x1 : ffff8000121e1f80 x0 : 0000000000000000 Call trace: cpu_max_bits_warn kernel/trace/trace_preemptirq.c:-1 [inline] cpumask_check include/linux/cpumask.h:117 [inline] cpumask_test_cpu include/linux/cpumask.h:444 [inline] cpu_online include/linux/cpumask.h:1030 [inline] trace_irq_disable include/trace/events/preemptirq.h:36 [inline] trace_hardirqs_off_finish+0x214/0x48c kernel/trace/trace_preemptirq.c:67 __enter_from_kernel_mode arch/arm64/kernel/entry-common.c:53 [inline] enter_from_kernel_mode+0x48/0x78 arch/arm64/kernel/entry-common.c:58 __el1_irq arch/arm64/kernel/entry-common.c:468 [inline] el1_interrupt+0x24/0x54 arch/arm64/kernel/entry-common.c:486 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:491 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:581 __memcpy+0x164/0x250 arch/arm64/lib/memcpy.S:177 0xffffe0001d5af400 irq event stamp: 41075 hardirqs last enabled at (41075): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1374 [inline] hardirqs last enabled at (41075): [] finish_lock_switch+0xb0/0x1c8 kernel/sched/core.c:5005 hardirqs last disabled at (41074): [] __schedule+0x294/0x1a6c kernel/sched/core.c:6461 softirqs last enabled at (40996): [] softirq_handle_end kernel/softirq.c:439 [inline] softirqs last enabled at (40996): [] handle_softirqs+0xb1c/0xc90 kernel/softirq.c:624 softirqs last disabled at (40985): [] __do_softirq+0x14/0x20 kernel/softirq.c:630 ---[ end trace 0000000000000000 ]--- ------------[ cut here ]------------ WARNING: CPU: 0 PID: 4598 at kernel/context_tracking.c:214 ct_nmi_exit+0x168/0x1e8 kernel/context_tracking.c:244 Modules linked in: CPU: 0 PID: 4598 Comm: syz.0.51 Tainted: G B D W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026 pstate: 624003c5 (nZCv DAIF +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : ct_nmi_exit+0x168/0x1e8 kernel/context_tracking.c:244 lr : ct_dynticks_nmi_nesting include/linux/context_tracking_state.h:92 [inline] lr : ct_nmi_exit+0x4c/0x1e8 kernel/context_tracking.c:214 sp : ffff800021f26130 x29: ffff800021f26130 x28: ffff0000cb205400 x27: 0000000000000000 x26: dfff800000000000 x25: ffff0000ead7a02d x24: ffff8000152e2968 x23: 00000000224000c5 x22: ffff800008515edc x21: ffff800015380f40 x20: ffff8000152e42f0 x19: ffff80018a0bd000 x18: 1fffe00033e7697e x17: 0000000000000000 x16: ffff8000086ddc3c x15: 0000000000000000 x14: 0000000000000002 x13: 0000000000ff0100 x12: ffff8000153ab600 x11: ff008000086ddc4c x10: 0000000000000000 x9 : ffff8000086ddc4c x8 : 0000000000000000 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff800021f259d8 x4 : ffff800015464e80 x3 : 0000000000000000 x2 : ffff800021f260a0 x1 : ffff800011d65a80 x0 : ffff80018a0de000 Call trace: ct_nmi_exit+0x168/0x1e8 kernel/context_tracking.c:244 arm64_exit_el1_dbg+0x28/0x5c arch/arm64/kernel/entry-common.c:221 el1_dbg+0x6c/0x80 arch/arm64/kernel/entry-common.c:408 el1h_64_sync_handler+0x40/0xac arch/arm64/kernel/entry-common.c:447 el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:580 cpu_max_bits_warn kernel/trace/trace_preemptirq.c:-1 [inline] cpumask_check include/linux/cpumask.h:117 [inline] cpumask_test_cpu include/linux/cpumask.h:444 [inline] cpu_online include/linux/cpumask.h:1030 [inline] trace_irq_disable include/trace/events/preemptirq.h:36 [inline] trace_hardirqs_off_finish+0x214/0x48c kernel/trace/trace_preemptirq.c:67 __enter_from_kernel_mode arch/arm64/kernel/entry-common.c:53 [inline] enter_from_kernel_mode+0x48/0x78 arch/arm64/kernel/entry-common.c:58 __el1_irq arch/arm64/kernel/entry-common.c:468 [inline] el1_interrupt+0x24/0x54 arch/arm64/kernel/entry-common.c:486 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:491 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:581 __memcpy+0x164/0x250 arch/arm64/lib/memcpy.S:177 0xffffe0001d5af400 irq event stamp: 41075 hardirqs last enabled at (41075): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1374 [inline] hardirqs last enabled at (41075): [] finish_lock_switch+0xb0/0x1c8 kernel/sched/core.c:5005 hardirqs last disabled at (41074): [] __schedule+0x294/0x1a6c kernel/sched/core.c:6461 softirqs last enabled at (40996): [] softirq_handle_end kernel/softirq.c:439 [inline] softirqs last enabled at (40996): [] handle_softirqs+0xb1c/0xc90 kernel/softirq.c:624 softirqs last disabled at (40985): [] __do_softirq+0x14/0x20 kernel/softirq.c:630 ---[ end trace 0000000000000000 ]---