Buffer I/O error on dev sr0, logical block 7, async page read
loop5: detected capacity change from 0 to 224
loop7: detected capacity change from 0 to 136
isofs_fill_super: bread failed, dev=loop7, iso_blknum=34, block=68
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000004: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027]
CPU: 0 UID: 0 PID: 227 Comm: kworker/u9:4 Not tainted 6.18.0-rc6-next-20251119 #1 PREEMPT(voluntary)
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Workqueue: writeback wb_workfn (flush-8:0)
RIP: 0010:ext4_bio_write_folio+0x91c/0x13c0
Code: 49 8b 45 18 48 c1 ea 03 42 80 3c 22 00 0f 85 40 0a 00 00 4d 8b 75 20 48 8d 7d 20 49 c1 ee 09 4c 0f af f0 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 40 09 00 00 48 8d 7d 38 4c 89 75 20 48 89 f8
RSP: 0018:ffff888016ca6f80 EFLAGS: 00010212
RAX: 0000000000000004 RBX: ffff888016ca7528 RCX: 0000000000000080
RDX: 1ffff1100395ec95 RSI: ffffffff823c3fee RDI: 0000000000000020
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8664f957 R11: ffff888052afb6d0 R12: dffffc0000000000
R13: ffff88801caf6488 R14: 0000000000053000 R15: ffffea0000c2eb00
FS: 0000000000000000(0000) GS:ffff8880e538f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1782ef7344 CR3: 000000000b9b0000 CR4: 0000000000350ef0
Call Trace:
mpage_process_page_bufs+0x5fb/0x760
mpage_prepare_extent_to_map+0xc85/0x12c0
ext4_do_writepages+0xbaa/0x3880
ext4_writepages+0x369/0x7a0
do_writepages+0x244/0x5c0
__writeback_single_inode+0x104/0x1300
writeback_sb_inodes+0x782/0x1b80
__writeback_inodes_wb+0xbe/0x270
wb_writeback+0x68b/0xa40
wb_workfn+0x829/0xb50
process_one_work+0x8e1/0x19c0
worker_thread+0x67e/0xe90
kthread+0x3c8/0x740
ret_from_fork+0x67a/0x7a0
ret_from_fork_asm+0x1a/0x30
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_bio_write_folio+0x91c/0x13c0
Code: 49 8b 45 18 48 c1 ea 03 42 80 3c 22 00 0f 85 40 0a 00 00 4d 8b 75 20 48 8d 7d 20 49 c1 ee 09 4c 0f af f0 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 40 09 00 00 48 8d 7d 38 4c 89 75 20 48 89 f8
RSP: 0018:ffff888016ca6f80 EFLAGS: 00010212
RAX: 0000000000000004 RBX: ffff888016ca7528 RCX: 0000000000000080
RDX: 1ffff1100395ec95 RSI: ffffffff823c3fee RDI: 0000000000000020
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8664f957 R11: ffff888052afb6d0 R12: dffffc0000000000
R13: ffff88801caf6488 R14: 0000000000053000 R15: ffffea0000c2eb00
FS: 0000000000000000(0000) GS:ffff8880e538f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1782ef7344 CR3: 000000000b9b0000 CR4: 0000000000350ef0
------------[ cut here ]------------
WARNING: kernel/exit.c:902 at do_exit+0x1c43/0x2970, CPU#0: kworker/u9:4/227
Modules linked in:
CPU: 0 UID: 0 PID: 227 Comm: kworker/u9:4 Tainted: G D 6.18.0-rc6-next-20251119 #1 PREEMPT(voluntary)
Tainted: [D]=DIE
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Workqueue: writeback wb_workfn (flush-8:0)
RIP: 0010:do_exit+0x1c43/0x2970
Code: 37 0a 00 00 c7 43 18 00 00 00 00 e9 14 e6 ff ff e8 12 7b 39 00 bf 02 24 00 00 e8 48 76 0b 00 e9 41 ff ff ff e8 fe 7a 39 00 90 <0f> 0b 90 e9 7a e4 ff ff e8 f0 7a 39 00 4c 89 e6 bf 05 06 00 00 e8
RSP: 0018:ffff888016ca7e40 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000200 RCX: ffffffff813b86f7
RDX: ffff888009cfd340 RSI: ffffffff813ba2b2 RDI: ffff888009cfe528
RBP: ffff888009cfd340 R08: 0000000000000001 R09: fffffbfff0f5bce8
R10: 0000000000000200 R11: 0000000000000001 R12: 000000000000000b
R13: 0000000000002710 R14: dffffc0000000004 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880e538f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1782ef7344 CR3: 000000000b9b0000 CR4: 0000000000350ef0
Call Trace:
make_task_dead+0x174/0x3b0
rewind_stack_and_make_dead+0x16/0x20
RIP: 0000:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0000:0000000000000000 EFLAGS: 00000000 ORIG_RAX: 0000000000000000
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
irq event stamp: 194449
hardirqs last enabled at (194449): [] irqentry_exit+0x17b/0x650
hardirqs last disabled at (194447): [] handle_softirqs+0x633/0x770
kexec: Could not allocate control_code_buffer
softirqs last enabled at (194448): [] handle_softirqs+0x50c/0x770
softirqs last disabled at (194435): [] __irq_exit_rcu+0xc4/0x100
---[ end trace 0000000000000000 ]---
kworker/u9:4 (227) used greatest stack depth: 22360 bytes left
loop5: detected capacity change from 0 to 224
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Buffer I/O error on dev sr0, logical block 0, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 1 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Buffer I/O error on dev sr0, logical block 1, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 2 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Buffer I/O error on dev sr0, logical block 2, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 3 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Buffer I/O error on dev sr0, logical block 3, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 4 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Buffer I/O error on dev sr0, logical block 4, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 5 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Buffer I/O error on dev sr0, logical block 5, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 6 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Buffer I/O error on dev sr0, logical block 6, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 7 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Buffer I/O error on dev sr0, logical block 7, async page read
loop5: detected capacity change from 0 to 224
loop7: detected capacity change from 0 to 136
isofs_fill_super: bread failed, dev=loop7, iso_blknum=34, block=68
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Buffer I/O error on dev sr0, logical block 0, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 1 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Buffer I/O error on dev sr0, logical block 1, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
----------------
Code disassembly (best guess):
0: 49 8b 45 18 mov 0x18(%r13),%rax
4: 48 c1 ea 03 shr $0x3,%rdx
8: 42 80 3c 22 00 cmpb $0x0,(%rdx,%r12,1)
d: 0f 85 40 0a 00 00 jne 0xa53
13: 4d 8b 75 20 mov 0x20(%r13),%r14
17: 48 8d 7d 20 lea 0x20(%rbp),%rdi
1b: 49 c1 ee 09 shr $0x9,%r14
1f: 4c 0f af f0 imul %rax,%r14
23: 48 89 f8 mov %rdi,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction
2f: 0f 85 40 09 00 00 jne 0x975
35: 48 8d 7d 38 lea 0x38(%rbp),%rdi
39: 4c 89 75 20 mov %r14,0x20(%rbp)
3d: 48 89 f8 mov %rdi,%rax