general protection fault, probably for non-canonical address 0xdffffc0004000448: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: probably user-memory-access in range [0x0000000020002240-0x0000000020002247] CPU: 0 PID: 4296 Comm: syz-executor.6 Not tainted 6.3.0-rc3-next-20230327 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:do_iter_read+0x481/0x750 Code: 00 0f 85 52 02 00 00 4d 8b 7c 24 28 e8 48 2c c6 ff 48 8b 44 24 18 80 38 00 0f 85 1c 02 00 00 48 8b 43 18 48 89 c2 48 c1 ea 03 <42> 80 3c 32 00 0f 85 ef 01 00 00 48 8b 4c 24 20 48 8b 30 80 39 00 RSP: 0018:ffff888043e07c78 EFLAGS: 00010216 RAX: 0000000020002240 RBX: ffff888043e07d60 RCX: ffffc90008c49000 RDX: 0000000004000448 RSI: ffffffff81855c98 RDI: 0000000000000007 RBP: 000000000000100d R08: 0000000000000007 R09: 0000000000000000 R10: 000000000000100d R11: 0000000000000001 R12: ffff8880100eaa00 R13: 0000000000000000 R14: dffffc0000000000 R15: ffffffff8491de20 FS: 00007fbd4a2c2700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2c721000 CR3: 000000001685c000 CR4: 0000000000350ef0 Call Trace: vfs_readv+0xe5/0x160 __x64_sys_preadv+0x233/0x310 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc RIP: 0033:0x7fbd4cd4cb19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fbd4a2c2188 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 00007fbd4ce5ff60 RCX: 00007fbd4cd4cb19 RDX: 0000000000000001 RSI: 0000000020000100 RDI: 0000000000000003 RBP: 00007fbd4cda6f6d R08: 0000000000000000 R09: 0000000000000000 R10: 000000007fffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffece214edf R14: 00007fbd4a2c2300 R15: 0000000000022000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:do_iter_read+0x481/0x750 Code: 00 0f 85 52 02 00 00 4d 8b 7c 24 28 e8 48 2c c6 ff 48 8b 44 24 18 80 38 00 0f 85 1c 02 00 00 48 8b 43 18 48 89 c2 48 c1 ea 03 <42> 80 3c 32 00 0f 85 ef 01 00 00 48 8b 4c 24 20 48 8b 30 80 39 00 RSP: 0018:ffff888043e07c78 EFLAGS: 00010216 RAX: 0000000020002240 RBX: ffff888043e07d60 RCX: ffffc90008c49000 RDX: 0000000004000448 RSI: ffffffff81855c98 RDI: 0000000000000007 RBP: 000000000000100d R08: 0000000000000007 R09: 0000000000000000 R10: 000000000000100d R11: 0000000000000001 R12: ffff8880100eaa00 R13: 0000000000000000 R14: dffffc0000000000 R15: ffffffff8491de20 FS: 00007fbd4a2c2700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2c721000 CR3: 000000001685c000 CR4: 0000000000350ef0 audit: type=1400 audit(1679920851.890:9): avc: denied { block_suspend } for pid=4343 comm="syz-executor.3" capability=36 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1 audit: type=1400 audit(1679920852.610:10): avc: denied { read } for pid=4411 comm="syz-executor.7" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=perf_event permissive=1 audit: type=1400 audit(1679920852.735:11): avc: denied { tracepoint } for pid=4424 comm="syz-executor.2" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=perf_event permissive=1 FAT-fs (loop5): bogus number of reserved sectors FAT-fs (loop5): Can't find a valid FAT filesystem FAT-fs (loop5): bogus number of reserved sectors FAT-fs (loop5): Can't find a valid FAT filesystem loop5: detected capacity change from 0 to 40 syz-executor.5: attempt to access beyond end of device loop5: rw=2049, sector=40, nr_sectors = 4 limit=40 Buffer I/O error on dev loop5, logical block 10, lost async page write syz-executor.5: attempt to access beyond end of device loop5: rw=2049, sector=44, nr_sectors = 4 limit=40 syz-executor.5: attempt to access beyond end of device loop5: rw=2049, sector=44, nr_sectors = 4 limit=40 loop5: detected capacity change from 0 to 40 ---------------- Code disassembly (best guess): 0: 00 0f add %cl,(%rdi) 2: 85 52 02 test %edx,0x2(%rdx) 5: 00 00 add %al,(%rax) 7: 4d 8b 7c 24 28 mov 0x28(%r12),%r15 c: e8 48 2c c6 ff callq 0xffc62c59 11: 48 8b 44 24 18 mov 0x18(%rsp),%rax 16: 80 38 00 cmpb $0x0,(%rax) 19: 0f 85 1c 02 00 00 jne 0x23b 1f: 48 8b 43 18 mov 0x18(%rbx),%rax 23: 48 89 c2 mov %rax,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 42 80 3c 32 00 cmpb $0x0,(%rdx,%r14,1) <-- trapping instruction 2f: 0f 85 ef 01 00 00 jne 0x224 35: 48 8b 4c 24 20 mov 0x20(%rsp),%rcx 3a: 48 8b 30 mov (%rax),%rsi 3d: 80 39 00 cmpb $0x0,(%rcx)