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Date: Sat, 24 Jun 2023 19:21:44 -0700
From: syzbot <syzbot+94a8c779c6b238870393@...kaller.appspotmail.com>
To: adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org,
linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
syzkaller-bugs@...glegroups.com, tytso@....edu
Subject: [syzbot] [ext4?] general protection fault in ext4_put_io_end_defer
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@...kaller.appspotmail.com
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@...glegroups.com.
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
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