loop0: rw=524288, want=32, limit=16 erofs: (device loop0): z_erofs_lz4_decompress: failed to decompress -29 in[58, 4038] out[3537] ================================================================== BUG: KASAN: vmalloc-out-of-bounds in hex_dump_to_buffer+0x5dc/0x984 lib/hexdump.c:193 Read of size 1 at addr ffff80001d2a3000 by task syz.0.16/5045 CPU: 1 PID: 5045 Comm: syz.0.16 Not tainted 5.15.178-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call trace: dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 print_address_description+0x7c/0x3f0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0x174/0x1e4 mm/kasan/report.c:451 __asan_report_load1_noabort+0x44/0x50 mm/kasan/report_generic.c:306 hex_dump_to_buffer+0x5dc/0x984 lib/hexdump.c:193 print_hex_dump+0x140/0x248 lib/hexdump.c:276 z_erofs_lz4_decompress+0x7a0/0xf28 fs/erofs/decompressor.c:243 z_erofs_decompress_generic fs/erofs/decompressor.c:332 [inline] z_erofs_decompress+0x720/0xeec fs/erofs/decompressor.c:410 z_erofs_decompress_pcluster fs/erofs/zdata.c:980 [inline] z_erofs_decompress_queue+0x1158/0x1bc0 fs/erofs/zdata.c:1058 z_erofs_runqueue+0x11d0/0x1474 fs/erofs/zdata.c:1370 z_erofs_readahead+0x864/0xc98 fs/erofs/zdata.c:1459 read_pages+0x13c/0x420 mm/readahead.c:130 page_cache_ra_unbounded+0x534/0x654 mm/readahead.c:239 do_page_cache_ra mm/readahead.c:269 [inline] force_page_cache_ra+0x320/0x388 mm/readahead.c:301 force_page_cache_readahead mm/internal.h:78 [inline] generic_fadvise+0x490/0x750 mm/fadvise.c:107 vfs_fadvise mm/fadvise.c:186 [inline] ksys_fadvise64_64 mm/fadvise.c:200 [inline] __do_sys_fadvise64_64 mm/fadvise.c:208 [inline] __se_sys_fadvise64_64 mm/fadvise.c:206 [inline] __arm64_sys_fadvise64_64+0x12c/0x174 mm/fadvise.c:206 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Memory state around the buggy address: ffff80001d2a2f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff80001d2a2f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff80001d2a3000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ^ ffff80001d2a3080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ffff80001d2a3100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ================================================================== Unable to handle kernel paging request at virtual address ffff80001d2a3000 Mem abort info: ESR = 0x0000000096000007 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x07: level 3 translation fault Data abort info: ISV = 0, ISS = 0x00000007 CM = 0, WnR = 0 swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000001ae196000 [ffff80001d2a3000] pgd=100000023ffff003, p4d=100000023ffff003, pud=100000023fffe003, pmd=10000001022d5003, pte=0000000000000000 Internal error: Oops: 0000000096000007 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 5045 Comm: syz.0.16 Tainted: G B 5.15.178-syzkaller #0 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 : hex_dump_to_buffer+0x4d4/0x984 lib/hexdump.c:193 lr : hex_dump_to_buffer+0x5dc/0x984 lib/hexdump.c:193 sp : ffff800020596a00 x29: ffff800020596a40 x28: 000000000000000b x27: 0000000000000021 x26: ffff800020596b1f x25: ffff80001d2a3000 x24: 0000000000000022 x23: dfff800000000000 x22: 0000000000000083 x21: 0000000000000021 x20: 0000000000000000 x19: 0000000000000023 x18: 0000000000000005 x17: 0000000000000000 x16: ffff80000824ec08 x15: 00000000ffffffff x14: ffff0000dc3951c0 x13: 0000000000000001 x12: ffff700002e3a964 x11: 0000000000000003 x10: 0000000000000000 x9 : 0000000000000000 x8 : ffff0000dc3951c0 x7 : 0000000000000000 x6 : 0000000000000001 x5 : ffff800020596098 x4 : 0000000000000000 x3 : ffff80000819c3f0 x2 : 0000000000000001 x1 : 0000000000000001 x0 : 0000000000000001 Call trace: hex_dump_to_buffer+0x4d4/0x984 lib/hexdump.c:193 print_hex_dump+0x140/0x248 lib/hexdump.c:276 z_erofs_lz4_decompress+0x7a0/0xf28 fs/erofs/decompressor.c:243 z_erofs_decompress_generic fs/erofs/decompressor.c:332 [inline] z_erofs_decompress+0x720/0xeec fs/erofs/decompressor.c:410 z_erofs_decompress_pcluster fs/erofs/zdata.c:980 [inline] z_erofs_decompress_queue+0x1158/0x1bc0 fs/erofs/zdata.c:1058 z_erofs_runqueue+0x11d0/0x1474 fs/erofs/zdata.c:1370 z_erofs_readahead+0x864/0xc98 fs/erofs/zdata.c:1459 read_pages+0x13c/0x420 mm/readahead.c:130 page_cache_ra_unbounded+0x534/0x654 mm/readahead.c:239 do_page_cache_ra mm/readahead.c:269 [inline] force_page_cache_ra+0x320/0x388 mm/readahead.c:301 force_page_cache_readahead mm/internal.h:78 [inline] generic_fadvise+0x490/0x750 mm/fadvise.c:107 vfs_fadvise mm/fadvise.c:186 [inline] ksys_fadvise64_64 mm/fadvise.c:200 [inline] __do_sys_fadvise64_64 mm/fadvise.c:208 [inline] __se_sys_fadvise64_64 mm/fadvise.c:206 [inline] __arm64_sys_fadvise64_64+0x12c/0x174 mm/fadvise.c:206 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Code: 8b1c0119 d343ff28 38f76908 350007c8 (39400334) ---[ end trace 48f71f8bbce760ce ]--- ---------------- Code disassembly (best guess): 0: 8b1c0119 add x25, x8, x28 4: d343ff28 lsr x8, x25, #3 8: 38f76908 ldrsb w8, [x8, x23] c: 350007c8 cbnz w8, 0x104 * 10: 39400334 ldrb w20, [x25] <-- trapping instruction