Hello, syzbot found the following issue on: HEAD commit: f7efed9f38f8 Add linux-next specific files for 20230616 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=152e89f3280000 kernel config: https://syzkaller.appspot.com/x/.config?x=60b1a32485a77c16 dashboard link: https://syzkaller.appspot.com/bug?extid=94a8c779c6b238870393 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=116af1eb280000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14e22d2f280000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/95bcbee03439/disk-f7efed9f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/6fd295caa4de/vmlinux-f7efed9f.xz kernel image: https://storage.googleapis.com/syzbot-assets/69c038a34b5f/bzImage-f7efed9f.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+94a8c779c6b238870393@xxxxxxxxxxxxxxxxxxxxxxxxx general protection fault, probably for non-canonical address 0xdffffc00000000c5: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000628-0x000000000000062f] CPU: 1 PID: 5032 Comm: syz-executor136 Not tainted 6.4.0-rc6-next-20230616-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 RIP: 0010:EXT4_SB fs/ext4/ext4.h:1741 [inline] RIP: 0010:ext4_add_complete_io fs/ext4/page-io.c:225 [inline] RIP: 0010:ext4_put_io_end_defer fs/ext4/page-io.c:297 [inline] RIP: 0010:ext4_put_io_end_defer+0x162/0x460 fs/ext4/page-io.c:289 Code: c1 ea 03 80 3c 02 00 0f 85 b9 02 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b 6c 24 28 49 8d bd 28 06 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 c0 02 00 00 f7 d3 31 ff 4d 8b ad 28 06 00 00 83 RSP: 0000:ffffc900001e0cb8 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000100 RDX: 00000000000000c5 RSI: ffffffff8234a5d2 RDI: 0000000000000628 RBP: ffff888076af2180 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: ffff88807f3ee6b0 R13: 0000000000000000 R14: ffff8880213eb400 R15: ffff8880213eb3d8 FS: 0000555556fc0300(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000002a18c000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> ext4_end_bio+0x282/0x560 fs/ext4/page-io.c:359 bio_endio+0x589/0x690 block/bio.c:1617 req_bio_endio block/blk-mq.c:766 [inline] blk_update_request+0x56b/0x14f0 block/blk-mq.c:911 scsi_end_request+0x7a/0xa20 drivers/scsi/scsi_lib.c:541 scsi_io_completion+0x17b/0x1770 drivers/scsi/scsi_lib.c:978 scsi_complete+0x126/0x3b0 drivers/scsi/scsi_lib.c:1442 blk_complete_reqs+0xb3/0xf0 block/blk-mq.c:1110 __do_softirq+0x1d4/0x905 kernel/softirq.c:553 invoke_softirq kernel/softirq.c:427 [inline] __irq_exit_rcu kernel/softirq.c:632 [inline] irq_exit_rcu+0xb7/0x120 kernel/softirq.c:644 sysvec_apic_timer_interrupt+0x97/0xc0 arch/x86/kernel/apic/apic.c:1109 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:200 Code: f6 da 90 02 66 0f 1f 44 00 00 f3 0f 1e fa 48 8b be b0 01 00 00 e8 b0 ff ff ff 31 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 <f3> 0f 1e fa 65 8b 05 1d 58 7f 7e 89 c1 48 8b 34 24 81 e1 00 01 00 RSP: 0000:ffffc900039df500 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000200 RCX: 0000000000000000 RDX: ffff8880265c1dc0 RSI: ffffffff81687255 RDI: 0000000000000007 RBP: ffffffff8d4ba518 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000200 R11: 00000000000000d4 R12: 0000000000000000 R13: ffffffff8d4ba4c0 R14: dffffc0000000000 R15: 0000000000000001 console_emit_next_record arch/x86/include/asm/irqflags.h:42 [inline] console_flush_all+0x61b/0xcc0 kernel/printk/printk.c:2933 console_unlock+0xb8/0x1f0 kernel/printk/printk.c:3007 vprintk_emit+0x1bd/0x600 kernel/printk/printk.c:2307 vprintk+0x84/0xa0 kernel/printk/printk_safe.c:50 _printk+0xbf/0xf0 kernel/printk/printk.c:2328 __list_add_valid+0xb9/0x100 lib/list_debug.c:30 __list_add include/linux/list.h:69 [inline] list_add_tail include/linux/list.h:102 [inline] list_lru_add+0x298/0x520 mm/list_lru.c:129 d_lru_add fs/dcache.c:431 [inline] retain_dentry fs/dcache.c:685 [inline] dput+0x806/0xe10 fs/dcache.c:908 do_unlinkat+0x3f3/0x680 fs/namei.c:4398 do_coredump+0x1836/0x4040 fs/coredump.c:675 get_signal+0x1c16/0x25f0 kernel/signal.c:2863 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204 irqentry_exit_to_user_mode+0x9/0x40 kernel/entry/common.c:310 exc_page_fault+0xc0/0x170 arch/x86/mm/fault.c:1593 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0033:0x7f7d17d7ce13 ------------[ cut here ]------------ WARNING: CPU: 1 PID: 5032 at arch/x86/mm/tlb.c:1295 nmi_uaccess_okay+0x99/0xb0 arch/x86/mm/tlb.c:1295 Modules linked in: CPU: 1 PID: 5032 Comm: syz-executor136 Not tainted 6.4.0-rc6-next-20230616-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 RIP: 0010:nmi_uaccess_okay+0x99/0xb0 arch/x86/mm/tlb.c:1295 Code: d8 48 ba 00 f0 ff ff ff ff 0f 00 41 b8 01 00 00 00 48 21 d0 48 ba 00 00 00 00 80 88 ff ff 48 01 d0 48 39 85 80 00 00 00 74 b0 <0f> 0b eb ac 0f 0b eb a0 e8 ba d5 9d 00 eb 8d e8 b3 d5 9d 00 eb be RSP: 0000:ffffc900001e0938 EFLAGS: 00010007 RAX: ffff88802a18c000 RBX: ffff88807f50b600 RCX: 0000000000000100 RDX: ffff888000000000 RSI: ffffffff8a11653d RDI: ffff88807f50b680 RBP: ffff88807f50b600 R08: 0000000000000001 R09: 00007f7d17d7cde9 R10: 00007f7d17d7ce29 R11: 0000000000096001 R12: 00007f7d17d7cde9 R13: 00007f7d17d7ce29 R14: 0000000000000000 R15: ffffc900001e0aa8 FS: 0000555556fc0300(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000002a18c000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> copy_from_user_nmi+0x62/0x150 arch/x86/lib/usercopy.c:39 copy_code arch/x86/kernel/dumpstack.c:91 [inline] show_opcodes+0x5d/0xd0 arch/x86/kernel/dumpstack.c:121 show_ip arch/x86/kernel/dumpstack.c:144 [inline] show_iret_regs+0x30/0x60 arch/x86/kernel/dumpstack.c:149 __show_regs+0x22/0x680 arch/x86/kernel/process_64.c:75 show_trace_log_lvl+0x255/0x390 arch/x86/kernel/dumpstack.c:301 __die_body arch/x86/kernel/dumpstack.c:420 [inline] die_addr+0x3c/0xa0 arch/x86/kernel/dumpstack.c:460 __exc_general_protection arch/x86/kernel/traps.c:783 [inline] exc_general_protection+0x129/0x230 arch/x86/kernel/traps.c:728 asm_exc_general_protection+0x26/0x30 arch/x86/include/asm/idtentry.h:564 RIP: 0010:EXT4_SB fs/ext4/ext4.h:1741 [inline] RIP: 0010:ext4_add_complete_io fs/ext4/page-io.c:225 [inline] RIP: 0010:ext4_put_io_end_defer fs/ext4/page-io.c:297 [inline] RIP: 0010:ext4_put_io_end_defer+0x162/0x460 fs/ext4/page-io.c:289 Code: c1 ea 03 80 3c 02 00 0f 85 b9 02 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b 6c 24 28 49 8d bd 28 06 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 c0 02 00 00 f7 d3 31 ff 4d 8b ad 28 06 00 00 83 RSP: 0000:ffffc900001e0cb8 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000100 RDX: 00000000000000c5 RSI: ffffffff8234a5d2 RDI: 0000000000000628 RBP: ffff888076af2180 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: ffff88807f3ee6b0 R13: 0000000000000000 R14: ffff8880213eb400 R15: ffff8880213eb3d8 ext4_end_bio+0x282/0x560 fs/ext4/page-io.c:359 bio_endio+0x589/0x690 block/bio.c:1617 req_bio_endio block/blk-mq.c:766 [inline] blk_update_request+0x56b/0x14f0 block/blk-mq.c:911 scsi_end_request+0x7a/0xa20 drivers/scsi/scsi_lib.c:541 scsi_io_completion+0x17b/0x1770 drivers/scsi/scsi_lib.c:978 scsi_complete+0x126/0x3b0 drivers/scsi/scsi_lib.c:1442 blk_complete_reqs+0xb3/0xf0 block/blk-mq.c:1110 __do_softirq+0x1d4/0x905 kernel/softirq.c:553 invoke_softirq kernel/softirq.c:427 [inline] __irq_exit_rcu kernel/softirq.c:632 [inline] irq_exit_rcu+0xb7/0x120 kernel/softirq.c:644 sysvec_apic_timer_interrupt+0x97/0xc0 arch/x86/kernel/apic/apic.c:1109 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:200 Code: f6 da 90 02 66 0f 1f 44 00 00 f3 0f 1e fa 48 8b be b0 01 00 00 e8 b0 ff ff ff 31 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 <f3> 0f 1e fa 65 8b 05 1d 58 7f 7e 89 c1 48 8b 34 24 81 e1 00 01 00 RSP: 0000:ffffc900039df500 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000200 RCX: 0000000000000000 RDX: ffff8880265c1dc0 RSI: ffffffff81687255 RDI: 0000000000000007 RBP: ffffffff8d4ba518 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000200 R11: 00000000000000d4 R12: 0000000000000000 R13: ffffffff8d4ba4c0 R14: dffffc0000000000 R15: 0000000000000001 console_emit_next_record arch/x86/include/asm/irqflags.h:42 [inline] console_flush_all+0x61b/0xcc0 kernel/printk/printk.c:2933 console_unlock+0xb8/0x1f0 kernel/printk/printk.c:3007 vprintk_emit+0x1bd/0x600 kernel/printk/printk.c:2307 vprintk+0x84/0xa0 kernel/printk/printk_safe.c:50 _printk+0xbf/0xf0 kernel/printk/printk.c:2328 __list_add_valid+0xb9/0x100 lib/list_debug.c:30 __list_add include/linux/list.h:69 [inline] list_add_tail include/linux/list.h:102 [inline] list_lru_add+0x298/0x520 mm/list_lru.c:129 d_lru_add fs/dcache.c:431 [inline] retain_dentry fs/dcache.c:685 [inline] dput+0x806/0xe10 fs/dcache.c:908 do_unlinkat+0x3f3/0x680 fs/namei.c:4398 do_coredump+0x1836/0x4040 fs/coredump.c:675 get_signal+0x1c16/0x25f0 kernel/signal.c:2863 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204 irqentry_exit_to_user_mode+0x9/0x40 kernel/entry/common.c:310 exc_page_fault+0xc0/0x170 arch/x86/mm/fault.c:1593 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0033:0x7f7d17d7ce13 Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 RSP: 002b:00007ffecfb11b00 EFLAGS: 00010202 RAX: 0000000000000000 RBX: 0000000000014024 RCX: 00007f7d17d95071 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00000000000001b1 R08: 0000000000000000 R09: 00007ffecfbcc080 R10: 0000000000000000 R11: 0000000000000000 R12: 00007ffecfb11b64 R13: 00007ffecfb11bc0 R14: 00000000000000d7 R15: 431bde82d7b634db </TASK> ---------------- Code disassembly (best guess): 0: c1 ea 03 shr $0x3,%edx 3: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 7: 0f 85 b9 02 00 00 jne 0x2c6 d: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 14: fc ff df 17: 4d 8b 6c 24 28 mov 0x28(%r12),%r13 1c: 49 8d bd 28 06 00 00 lea 0x628(%r13),%rdi 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 c0 02 00 00 jne 0x2f4 34: f7 d3 not %ebx 36: 31 ff xor %edi,%edi 38: 4d 8b ad 28 06 00 00 mov 0x628(%r13),%r13 3f: 83 .byte 0x83 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to change bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
