sg_write: data in/out 917468/251 bytes for SCSI command 0x0-- guessing data in; program syz-executor.5 not setting count and/or reply_len properly loop4: detected capacity change from 0 to 40 ------------[ cut here ]------------ WARNING: CPU: 1 PID: 7812 at lib/iov_iter.c:629 _copy_from_iter+0x2f1/0x1130 Modules linked in: CPU: 1 PID: 7812 Comm: syz-executor.5 Not tainted 6.1.0-next-20221214 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:_copy_from_iter+0x2f1/0x1130 Code: 37 ff 44 89 f3 e9 2f ff ff ff e8 ea 3a 37 ff be 79 02 00 00 48 c7 c7 80 c5 9e 84 e8 19 b7 5a ff e9 13 fe ff ff e8 cf 3a 37 ff <0f> 0b 45 31 f6 e9 77 ff ff ff e8 c0 3a 37 ff 31 ff 89 ee e8 87 36 RSP: 0018:ffff8880472df5e8 EFLAGS: 00010216 RAX: 0000000000005804 RBX: 0000000000000000 RCX: ffffc90009220000 RDX: 0000000000040000 RSI: ffffffff8211ef01 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000001000 R13: ffffea00011c7000 R14: 0000000000001000 R15: ffff8880472df818 FS: 00007f7b01047700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc105fead10 CR3: 000000004305e000 CR4: 0000000000350ee0 Call Trace: copy_page_from_iter+0xe3/0x180 blk_rq_map_user_iov+0xb0c/0x1650 blk_rq_map_user_io+0x1ee/0x220 sg_common_write.constprop.0+0xd84/0x15e0 sg_write.part.0+0x706/0xb20 sg_write+0x88/0xe0 vfs_write+0x358/0xe40 ksys_write+0x12b/0x260 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc FAULT_INJECTION: forcing a failure. name fail_usercopy, interval 1, probability 0, space 0, times 1 RIP: 0033:0x7f7b03ad1b19 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 CPU: 0 PID: 7823 Comm: syz-executor.2 Not tainted 6.1.0-next-20221214 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: dump_stack_lvl+0x8f/0xb7 RSP: 002b:00007f7b01047188 EFLAGS: 00000246 should_fail_ex.cold+0x5/0xa _copy_from_user+0x30/0x1f0 ORIG_RAX: 0000000000000001 kstrtouint_from_user+0xb0/0x170 RAX: ffffffffffffffda RBX: 00007f7b03be4f60 RCX: 00007f7b03ad1b19 RDX: 0000000000000125 RSI: 00000000200003c0 RDI: 0000000000000005 proc_fail_nth_write+0x7c/0x220 RBP: 00007f7b03b2bf6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 vfs_write+0x358/0xe40 R13: 00007ffc910d828f R14: 00007f7b01047300 R15: 0000000000022000 ksys_write+0x12b/0x260 irq event stamp: 5067 hardirqs last enabled at (5093): [] asm_sysvec_apic_timer_interrupt+0x1a/0x20 do_syscall_64+0x3f/0x90 hardirqs last disabled at (5118): [] sysvec_apic_timer_interrupt+0xf/0xc0 entry_SYSCALL_64_after_hwframe+0x72/0xdc softirqs last enabled at (1756): [] __irq_exit_rcu+0x11b/0x180 RIP: 0033:0x7f2d4438a5ff Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 99 fd ff ff 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 cc fd ff ff 48 softirqs last disabled at (1463): [] __irq_exit_rcu+0x11b/0x180 RSP: 002b:00007f2d4192c170 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2d4438a5ff ---[ end trace 0000000000000000 ]--- RDX: 0000000000000001 RSI: 00007f2d4192c1e0 RDI: 0000000000000004 RBP: 00007f2d4192c1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001 R13: 00007ffd50946cef R14: 00007f2d4192c300 R15: 0000000000022000 syz-executor.6: attempt to access beyond end of device loop6: rw=2049, sector=124, nr_sectors = 4 limit=40 Buffer I/O error on dev loop6, logical block 31, lost async page write syz-executor.4: attempt to access beyond end of device loop4: rw=2049, sector=124, nr_sectors = 4 limit=40 Buffer I/O error on dev loop4, logical block 31, lost async page write loop4: detected capacity change from 0 to 40 audit: type=1326 audit(1671087513.111:13): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=7856 comm="syz-executor.6" exe="/syz-executor.6" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f6ab9dcbb19 code=0x0 sr 1:0:0:0: [sr0] CDROM not ready. Make sure there is a disc in the drive. syz-executor.4: attempt to access beyond end of device loop4: rw=2049, sector=124, nr_sectors = 4 limit=40 Buffer I/O error on dev loop4, logical block 31, lost async page write audit: type=1326 audit(1671087513.941:14): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=7856 comm="syz-executor.6" exe="/syz-executor.6" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f6ab9dcbb19 code=0x0