WARNING in udf_truncate_extents

[Sanan Hasanov]

Good day, dear maintainers,

We found a bug using a modified kernel configuration file used by syzbot.

We enhanced the coverage of the configuration file using our tool, klocalizer.

Kernel Branch: 6.2.0-rc6-next-20230203
Kernel config: https://drive.google.com/file/d/1jWHyzy2KABqlRawd3FO2V2ZVNoMWpkZu/view?usp=share_link
C Reproducer: https://drive.google.com/file/d/1zH4AtT1D3O-vqihwMy-kxrFW6Rni6bZ_/view?usp=share_link

Thank you!

Best regards,
Sanan Hasanov

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WARNING: CPU: 6 PID: 10426 at fs/udf/truncate.c:208 udf_truncate_extents+0x8a9/0x9d0
Modules linked in:
CPU: 6 PID: 10426 Comm: syz-executor.3 Not tainted 6.2.0-rc6-next-20230203 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
RIP: 0010:udf_truncate_extents+0x8a9/0x9d0
Code: 84 d2 74 05 e8 e8 1e f9 fe 8b 44 24 20 be 07 00 00 00 48 89 df 89 83 cc fe ff ff e8 61 0b 13 ff e9 a5 fd ff ff e8 b7 23 aa fe <0f> 0b e9 1f fe ff ff e8 ab 23 aa fe 0f 0b 48 8b 7c 24 08 48 89 74
RSP: 0000:ffffc9000c6f7050 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888045252160 RCX: 0000000000000000
RDX: ffff888114e53900 RSI: ffffffff82d5b399 RDI: 0000000000000007
RBP: ffffc9000c6f7140 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000350 R11: 0000000000000001 R12: ffff8880530de000
R13: 0000000000000350 R14: 00000000000000ff R15: ffffc9000c6f7100
FS:  00007f601837e700(0000) GS:ffff888119f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000001ffffe40 CR3: 000000004c1b1000 CR4: 0000000000350ee0
Call Trace:
 <TASK>
 udf_write_failed.isra.0+0x173/0x1c0
 udf_write_begin+0x2c5/0x370
 generic_perform_write+0x259/0x580
 __generic_file_write_iter+0x2ae/0x500
 udf_file_write_iter+0x233/0x740
 __kernel_write_iter+0x262/0x7a0
 __kernel_write+0xc9/0x110
 dump_emit+0x21d/0x340
 elf_core_dump+0x215c/0x3720
 do_coredump+0x2d30/0x3ce0
 get_signal+0x1c11/0x25c0
 arch_do_signal_or_restart+0x79/0x5a0
 exit_to_user_mode_prepare+0x11f/0x240
 irqentry_exit_to_user_mode+0x9/0x30
 asm_exc_general_protection+0x26/0x30
RIP: 0033:0x7f601728edd5
Code: 0f 1f 44 00 00 f3 0f 1e fa 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 b8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 84
RSP: 002b:0000000020000040 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f60173bc120 RCX: 00007f601728edcd
RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000000
RBP: 00007f60172fc59c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc959cbaaf R14: 00007ffc959cbc50 R15: 00007f601837dd80
 </TASK>
irq event stamp: 1369
hardirqs last  enabled at (1379): [<ffffffff81643788>] __up_console_sem+0x78/0x80
hardirqs last disabled at (1388): [<ffffffff8164376d>] __up_console_sem+0x5d/0x80
softirqs last  enabled at (490): [<ffffffff814b2d7d>] __irq_exit_rcu+0x11d/0x190
softirqs last disabled at (351): [<ffffffff814b2d7d>] __irq_exit_rcu+0x11d/0x190
---[ end trace 0000000000000000 ]---