================================================================== BUG: KASAN: user-memory-access in instrument_atomic_read_write include/linux/instrumented.h:96 [inline] BUG: KASAN: user-memory-access in atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:400 [inline] BUG: KASAN: user-memory-access in __refcount_sub_and_test include/linux/refcount.h:264 [inline] BUG: KASAN: user-memory-access in __refcount_dec_and_test include/linux/refcount.h:307 [inline] BUG: KASAN: user-memory-access in refcount_dec_and_test include/linux/refcount.h:325 [inline] BUG: KASAN: user-memory-access in posix_acl_release include/linux/posix_acl.h:57 [inline] BUG: KASAN: user-memory-access in __destroy_inode+0x49c/0x860 fs/inode.c:373 Write of size 4 at addr 0000000b00000000 by task syz.0.124/7118 CPU: 1 UID: 0 PID: 7118 Comm: syz.0.124 Not tainted 6.14.0-rc6-syzkaller-g78e3fd2b7e4b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120 print_report+0xf8/0x550 mm/kasan/report.c:524 kasan_report+0xd8/0x138 mm/kasan/report.c:634 kasan_check_range+0x268/0x2a8 mm/kasan/generic.c:189 __kasan_check_write+0x20/0x30 mm/kasan/shadow.c:37 instrument_atomic_read_write include/linux/instrumented.h:96 [inline] atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:400 [inline] __refcount_sub_and_test include/linux/refcount.h:264 [inline] __refcount_dec_and_test include/linux/refcount.h:307 [inline] refcount_dec_and_test include/linux/refcount.h:325 [inline] posix_acl_release include/linux/posix_acl.h:57 [inline] __destroy_inode+0x49c/0x860 fs/inode.c:373 destroy_inode fs/inode.c:384 [inline] evict+0x71c/0x978 fs/inode.c:827 dispose_list fs/inode.c:845 [inline] evict_inodes+0x708/0x7a0 fs/inode.c:899 generic_shutdown_super+0xa0/0x2bc fs/super.c:627 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:1413 __cleanup_mnt+0x20/0x30 fs/namespace.c:1420 task_work_run+0x230/0x2e0 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x4e8/0x1acc kernel/exit.c:938 do_group_exit+0x194/0x22c kernel/exit.c:1087 get_signal+0x13e4/0x1500 kernel/signal.c:3036 do_signal+0x1a4/0x3a04 arch/arm64/kernel/signal.c:1658 do_notify_resume+0x74/0x1f4 arch/arm64/kernel/entry-common.c:148 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_da+0xbc/0x178 arch/arm64/kernel/entry-common.c:605 el0t_64_sync_handler+0xcc/0x108 arch/arm64/kernel/entry-common.c:765 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 ================================================================== Unable to handle kernel paging request at virtual address 0000000b00000000 Mem abort info: ESR = 0x0000000096000004 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x04: level 0 translation fault Data abort info: ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 user pgtable: 4k pages, 48-bit VAs, pgdp=00000001184f1000 [0000000b00000000] pgd=0000000000000000, p4d=0000000000000000 Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP Modules linked in: CPU: 0 UID: 0 PID: 7118 Comm: syz.0.124 Tainted: G B 6.14.0-rc6-syzkaller-g78e3fd2b7e4b #0 Tainted: [B]=BAD_PAGE Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __lse_atomic_fetch_add_release arch/arm64/include/asm/atomic_lse.h:62 [inline] pc : __lse_atomic_fetch_sub_release arch/arm64/include/asm/atomic_lse.h:76 [inline] pc : arch_atomic_fetch_sub_release arch/arm64/include/asm/atomic.h:51 [inline] pc : raw_atomic_fetch_sub_release include/linux/atomic/atomic-arch-fallback.h:944 [inline] pc : atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:401 [inline] pc : __refcount_sub_and_test include/linux/refcount.h:264 [inline] pc : __refcount_dec_and_test include/linux/refcount.h:307 [inline] pc : refcount_dec_and_test include/linux/refcount.h:325 [inline] pc : posix_acl_release include/linux/posix_acl.h:57 [inline] pc : __destroy_inode+0x4a8/0x860 fs/inode.c:373 lr : arch_atomic_fetch_sub_release arch/arm64/include/asm/atomic.h:51 [inline] lr : raw_atomic_fetch_sub_release include/linux/atomic/atomic-arch-fallback.h:944 [inline] lr : atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:401 [inline] lr : __refcount_sub_and_test include/linux/refcount.h:264 [inline] lr : __refcount_dec_and_test include/linux/refcount.h:307 [inline] lr : refcount_dec_and_test include/linux/refcount.h:325 [inline] lr : posix_acl_release include/linux/posix_acl.h:57 [inline] lr : __destroy_inode+0x4a4/0x860 fs/inode.c:373 sp : ffff80009f807370 x29: ffff80009f807370 x28: dfff800000000000 x27: 1fffe0001bb9ed4d x26: ffff700013f00e80 x25: 1fffe0001bb9ed67 x24: dfff800000000000 x23: ffff0000ddcf6a18 x22: ffff0000ca2fe068 x21: 0000000000000001 x20: 0000000000000000 x19: 0000000b00000000 x18: 1fffe000366f1886 x17: ffff80008fbbd000 x16: ffff8000832b7b9c x15: 0000000000000001 x14: 1ffff0001262eaf8 x13: 0000000000000000 x12: 0000000000000000 x11: ffff70001262eaf9 x10: 0000000000ff0100 x9 : 0000000000000000 x8 : 00000000ffffffff x7 : 1fffe000366f1887 x6 : ffff8000803d4bfc x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff8000802f88ec x2 : 0000000000000001 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: arch_atomic_fetch_sub_release arch/arm64/include/asm/atomic.h:51 [inline] (P) raw_atomic_fetch_sub_release include/linux/atomic/atomic-arch-fallback.h:944 [inline] (P) atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:401 [inline] (P) __refcount_sub_and_test include/linux/refcount.h:264 [inline] (P) __refcount_dec_and_test include/linux/refcount.h:307 [inline] (P) refcount_dec_and_test include/linux/refcount.h:325 [inline] (P) posix_acl_release include/linux/posix_acl.h:57 [inline] (P) __destroy_inode+0x4a8/0x860 fs/inode.c:373 (P) destroy_inode fs/inode.c:384 [inline] evict+0x71c/0x978 fs/inode.c:827 dispose_list fs/inode.c:845 [inline] evict_inodes+0x708/0x7a0 fs/inode.c:899 generic_shutdown_super+0xa0/0x2bc fs/super.c:627 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:1413 __cleanup_mnt+0x20/0x30 fs/namespace.c:1420 task_work_run+0x230/0x2e0 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x4e8/0x1acc kernel/exit.c:938 do_group_exit+0x194/0x22c kernel/exit.c:1087 get_signal+0x13e4/0x1500 kernel/signal.c:3036 do_signal+0x1a4/0x3a04 arch/arm64/kernel/signal.c:1658 do_notify_resume+0x74/0x1f4 arch/arm64/kernel/entry-common.c:148 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_da+0xbc/0x178 arch/arm64/kernel/entry-common.c:605 el0t_64_sync_handler+0xcc/0x108 arch/arm64/kernel/entry-common.c:765 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Code: 97fa49f6 d503201f 97e4eec7 12800008 (b8680274) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 97fa49f6 bl 0xffffffffffe927d8 4: d503201f nop 8: 97e4eec7 bl 0xffffffffff93bb24 c: 12800008 mov w8, #0xffffffff // #-1 * 10: b8680274 ldaddl w8, w20, [x19] <-- trapping instruction