==================================================================
BUG: KASAN: slab-use-after-free in __blk_rq_map_sg+0x67b/0x740
Read of size 8 at addr ffff888017606600 by task syz-executor.3/10340
CPU: 1 UID: 0 PID: 10340 Comm: syz-executor.3 Not tainted 6.19.0-rc4-next-20260108 #1 PREEMPT(voluntary)
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
dump_stack_lvl+0xca/0x120
print_report+0xcb/0x610
kasan_report+0xca/0x100
__blk_rq_map_sg+0x67b/0x740
scsi_alloc_sgtables+0x206/0xc30
sd_init_command+0x8d8/0x30e0
scsi_queue_rq+0x133b/0x3280
blk_mq_dispatch_rq_list+0x3ad/0x1c00
__blk_mq_sched_dispatch_requests+0xc37/0x13e0
blk_mq_sched_dispatch_requests+0xd7/0x1b0
blk_mq_run_hw_queue+0x3bd/0x640
blk_mq_dispatch_list+0x4de/0x1580
blk_mq_flush_plug_list+0x12a/0x5b0
__blk_flush_plug+0x25c/0x460
blk_finish_plug+0x53/0xa0
__iomap_dio_rw+0x9b9/0x1c30
iomap_dio_rw+0x40/0xa0
ext4_file_read_iter+0x2f6/0x4a0
copy_splice_read+0x5c2/0xc00
do_splice_read+0x22f/0x2a0
splice_direct_to_actor+0x2a8/0x9d0
do_splice_direct+0x179/0x250
do_sendfile+0xa8e/0xdc0
__x64_sys_sendfile64+0x14c/0x210
do_syscall_64+0xbf/0x420
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd68e1cab19
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
RSP: 002b:00007fd68b740188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fd68e2ddf60 RCX: 00007fd68e1cab19
RDX: 00000000200000c0 RSI: 0000000000000004 RDI: 0000000000000004
RBP: 00007fd68e224f6d R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fed8 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd46f0d76f R14: 00007fd68b740300 R15: 0000000000022000
Allocated by task 24:
kasan_save_stack+0x24/0x50
kasan_save_track+0x14/0x30
__kasan_slab_alloc+0x59/0x70
kmem_cache_alloc_noprof+0x212/0x760
mempool_alloc_noprof+0x1b3/0x300
__sg_alloc_table+0x252/0x390
sg_alloc_table_chained+0x9f/0x1f0
scsi_alloc_sgtables+0x1bb/0xc30
sd_init_command+0x8d8/0x30e0
scsi_queue_rq+0x133b/0x3280
blk_mq_dispatch_rq_list+0x3ad/0x1c00
__blk_mq_sched_dispatch_requests+0xc37/0x13e0
blk_mq_sched_dispatch_requests+0xd7/0x1b0
blk_mq_run_work_fn+0x1f9/0x380
process_one_work+0x8e1/0x1960
worker_thread+0x67e/0xe90
kthread+0x385/0x490
ret_from_fork+0x67a/0x7a0
ret_from_fork_asm+0x1a/0x30
Freed by task 10125:
kasan_save_stack+0x24/0x50
kasan_save_track+0x14/0x30
kasan_save_free_info+0x3a/0x60
__kasan_slab_free+0x43/0x70
kmem_cache_free+0x2cd/0x660
mempool_free+0xdb/0x130
__sg_free_table+0x125/0x1a0
sg_free_table_chained+0x8d/0xa0
scsi_end_request+0x5ac/0x9e0
scsi_io_completion+0xbf/0x1620
scsi_complete+0x37c/0x680
blk_complete_reqs+0xb2/0xf0
handle_softirqs+0x1b1/0x7d0
__irq_exit_rcu+0xc4/0x100
irq_exit_rcu+0x9/0x20
sysvec_call_function_single+0xa6/0xc0
asm_sysvec_call_function_single+0x1a/0x20
The buggy address belongs to the object at ffff888017606600
which belongs to the cache sgpool-128 of size 4096
The buggy address is located 0 bytes inside of
freed 4096-byte region [ffff888017606600, ffff888017607600)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888017606600 pfn:0x17600
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x100000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0100000000000040 ffff888009be8000 dead000000000122 0000000000000000
raw: ffff888017606600 0000000080070000 00000000f5000000 0000000000000000
head: 0100000000000040 ffff888009be8000 dead000000000122 0000000000000000
head: ffff888017606600 0000000080070000 00000000f5000000 0000000000000000
head: 0100000000000003 ffffea00005d8001 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888017606500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888017606580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888017606600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888017606680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888017606700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
------------[ cut here ]------------
WARNING: block/blk-mq-dma.c:309 at __blk_rq_map_sg+0x636/0x740, CPU#1: syz-executor.3/10340
Modules linked in:
CPU: 1 UID: 0 PID: 10340 Comm: syz-executor.3 Tainted: G B 6.19.0-rc4-next-20260108 #1 PREEMPT(voluntary)
Tainted: [B]=BAD_PAGE
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RIP: 0010:__blk_rq_map_sg+0x636/0x740
Code: ff ff e8 5d 20 30 ff b9 06 00 00 00 48 89 d8 48 8d bc 24 98 00 00 00 48 89 7c 24 20 f3 48 ab e9 fd fa ff ff e8 3b 20 30 ff 90 <0f> 0b 90 e9 f8 fd ff ff 48 89 cf e8 aa 6c 6e ff e9 66 fa ff ff 48
RSP: 0018:ffff888040bf6e20 EFLAGS: 00010246
RAX: 0000000000040000 RBX: 0000000000000002 RCX: ffffc90009b3e000
RDX: 0000000000040000 RSI: ffffffff82455855 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000001 R09: fffffbfff0f64098
R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000
R13: 0000000000000ffb R14: ffff88800c12f2c0 R15: ffff888040bf6fa8
FS: 00007fd68b740700(0000) GS:ffff8880e544d000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2a57cb0018 CR3: 000000004a41a000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
scsi_alloc_sgtables+0x206/0xc30
sd_init_command+0x8d8/0x30e0
scsi_queue_rq+0x133b/0x3280
blk_mq_dispatch_rq_list+0x3ad/0x1c00
__blk_mq_sched_dispatch_requests+0xc37/0x13e0
blk_mq_sched_dispatch_requests+0xd7/0x1b0
blk_mq_run_hw_queue+0x3bd/0x640
blk_mq_dispatch_list+0x4de/0x1580
blk_mq_flush_plug_list+0x12a/0x5b0
__blk_flush_plug+0x25c/0x460
blk_finish_plug+0x53/0xa0
__iomap_dio_rw+0x9b9/0x1c30
iomap_dio_rw+0x40/0xa0
ext4_file_read_iter+0x2f6/0x4a0
copy_splice_read+0x5c2/0xc00
do_splice_read+0x22f/0x2a0
splice_direct_to_actor+0x2a8/0x9d0
do_splice_direct+0x179/0x250
do_sendfile+0xa8e/0xdc0
__x64_sys_sendfile64+0x14c/0x210
do_syscall_64+0xbf/0x420
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd68e1cab19
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
RSP: 002b:00007fd68b740188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fd68e2ddf60 RCX: 00007fd68e1cab19
RDX: 00000000200000c0 RSI: 0000000000000004 RDI: 0000000000000004
RBP: 00007fd68e224f6d R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fed8 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd46f0d76f R14: 00007fd68b740300 R15: 0000000000022000
irq event stamp: 1299
hardirqs last enabled at (1299): [] irqentry_exit+0x17b/0x650
hardirqs last disabled at (1298): [] handle_softirqs+0x65e/0x7d0
softirqs last enabled at (630): [] __irq_exit_rcu+0xc4/0x100
softirqs last disabled at (605): [] __irq_exit_rcu+0xc4/0x100
---[ end trace 0000000000000000 ]---
------------[ cut here ]------------
kernel BUG at drivers/scsi/scsi_lib.c:1173!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 1 UID: 0 PID: 10340 Comm: syz-executor.3 Tainted: G B W 6.19.0-rc4-next-20260108 #1 PREEMPT(voluntary)
Tainted: [B]=BAD_PAGE, [W]=WARN
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RIP: 0010:scsi_alloc_sgtables+0xa32/0xc30
Code: e9 71 f7 ff ff e8 de 0c 32 fe 90 0f 0b 90 41 bc 0a 00 00 00 e9 c8 fc ff ff 41 bc 09 00 00 00 e9 bd fc ff ff e8 bf 0c 32 fe 90 <0f> 0b 45 31 f6 e9 b7 f9 ff ff e8 af 0c 32 fe be 01 00 00 00 31 ff
RSP: 0018:ffff888040bf6f60 EFLAGS: 00010246
RAX: 0000000000040000 RBX: ffff88800c12f3b8 RCX: ffffc90009b3e000
RDX: 0000000000040000 RSI: ffffffff83436bd1 RDI: 0000000000000004
RBP: 0000000000000002 R08: 0000000000000001 R09: fffffbfff0f64098
R10: 0000000000000002 R11: 0000000000000001 R12: 0000000000000001
R13: ffff88800c12f2dc R14: 0000000000000000 R15: 0000000000000000
FS: 00007fd68b740700(0000) GS:ffff8880e544d000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2a57cb0018 CR3: 000000004a41a000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
sd_init_command+0x8d8/0x30e0
scsi_queue_rq+0x133b/0x3280
blk_mq_dispatch_rq_list+0x3ad/0x1c00
__blk_mq_sched_dispatch_requests+0xc37/0x13e0
blk_mq_sched_dispatch_requests+0xd7/0x1b0
blk_mq_run_hw_queue+0x3bd/0x640
blk_mq_dispatch_list+0x4de/0x1580
blk_mq_flush_plug_list+0x12a/0x5b0
__blk_flush_plug+0x25c/0x460
blk_finish_plug+0x53/0xa0
__iomap_dio_rw+0x9b9/0x1c30
iomap_dio_rw+0x40/0xa0
ext4_file_read_iter+0x2f6/0x4a0
copy_splice_read+0x5c2/0xc00
do_splice_read+0x22f/0x2a0
splice_direct_to_actor+0x2a8/0x9d0
do_splice_direct+0x179/0x250
do_sendfile+0xa8e/0xdc0
__x64_sys_sendfile64+0x14c/0x210
do_syscall_64+0xbf/0x420
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd68e1cab19
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
RSP: 002b:00007fd68b740188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fd68e2ddf60 RCX: 00007fd68e1cab19
RDX: 00000000200000c0 RSI: 0000000000000004 RDI: 0000000000000004
RBP: 00007fd68e224f6d R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fed8 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd46f0d76f R14: 00007fd68b740300 R15: 0000000000022000
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:scsi_alloc_sgtables+0xa32/0xc30
Code: e9 71 f7 ff ff e8 de 0c 32 fe 90 0f 0b 90 41 bc 0a 00 00 00 e9 c8 fc ff ff 41 bc 09 00 00 00 e9 bd fc ff ff e8 bf 0c 32 fe 90 <0f> 0b 45 31 f6 e9 b7 f9 ff ff e8 af 0c 32 fe be 01 00 00 00 31 ff
RSP: 0018:ffff888040bf6f60 EFLAGS: 00010246
RAX: 0000000000040000 RBX: ffff88800c12f3b8 RCX: ffffc90009b3e000
RDX: 0000000000040000 RSI: ffffffff83436bd1 RDI: 0000000000000004
RBP: 0000000000000002 R08: 0000000000000001 R09: fffffbfff0f64098
R10: 0000000000000002 R11: 0000000000000001 R12: 0000000000000001
R13: ffff88800c12f2dc R14: 0000000000000000 R15: 0000000000000000
FS: 00007fd68b740700(0000) GS:ffff8880e544d000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2a57cb0018 CR3: 000000004a41a000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
------------[ cut here ]------------
WARNING: kernel/exit.c:902 at do_exit+0x1c21/0x2950, CPU#1: syz-executor.3/10340
Modules linked in:
CPU: 1 UID: 0 PID: 10340 Comm: syz-executor.3 Tainted: G B D W 6.19.0-rc4-next-20260108 #1 PREEMPT(voluntary)
Tainted: [B]=BAD_PAGE, [D]=DIE, [W]=WARN
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RIP: 0010:do_exit+0x1c21/0x2950
Code: 37 0a 00 00 c7 43 18 00 00 00 00 e9 36 e6 ff ff e8 b4 d4 39 00 bf 02 24 00 00 e8 3a 7f 0b 00 e9 41 ff ff ff e8 a0 d4 39 00 90 <0f> 0b 90 e9 9c e4 ff ff e8 92 d4 39 00 4c 89 e6 bf 05 06 00 00 e8
RSP: 0018:ffff888040bf7e40 EFLAGS: 00010246
RAX: 0000000000040000 RBX: 0000000000000200 RCX: ffffc90009b3e000
RDX: 0000000000040000 RSI: ffffffff813ba3f0 RDI: ffff888016762d40
RBP: ffff888016761b80 R08: 0000000000000001 R09: fffffbfff0f640d8
R10: 0000000000000200 R11: 0000000000000001 R12: 000000000000000b
R13: 0000000000002710 R14: ffff888016763208 R15: ffff888016761b80
FS: 00007fd68b740700(0000) GS:ffff8880e544d000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2a57cb0018 CR3: 000000004a41a000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
make_task_dead+0x174/0x3b0
rewind_stack_and_make_dead+0x16/0x20
RIP: 0033:0x7fd68e1cab19
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
RSP: 002b:00007fd68b740188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fd68e2ddf60 RCX: 00007fd68e1cab19
RDX: 00000000200000c0 RSI: 0000000000000004 RDI: 0000000000000004
RBP: 00007fd68e224f6d R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fed8 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd46f0d76f R14: 00007fd68b740300 R15: 0000000000022000
irq event stamp: 1299
hardirqs last enabled at (1299): [] irqentry_exit+0x17b/0x650
hardirqs last disabled at (1298): [] handle_softirqs+0x65e/0x7d0
softirqs last enabled at (630): [] __irq_exit_rcu+0xc4/0x100
softirqs last disabled at (605): [] __irq_exit_rcu+0xc4/0x100
---[ end trace 0000000000000000 ]---
BUG: sleeping function called from invalid context at kernel/locking/mutex.c:591
in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 10340, name: syz-executor.3
preempt_count: 0, expected: 0
RCU nest depth: 1, expected: 0
INFO: lockdep is turned off.
CPU: 1 UID: 0 PID: 10340 Comm: syz-executor.3 Tainted: G B D W 6.19.0-rc4-next-20260108 #1 PREEMPT(voluntary)
Tainted: [B]=BAD_PAGE, [D]=DIE, [W]=WARN
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
dump_stack_lvl+0xfa/0x120
__might_resched+0x2f3/0x510
__mutex_lock+0xc0/0x2380
sched_mm_cid_exit+0x9a/0x450
do_exit+0x2db/0x2950
make_task_dead+0x174/0x3b0
rewind_stack_and_make_dead+0x16/0x20
RIP: 0033:0x7fd68e1cab19
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
RSP: 002b:00007fd68b740188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fd68e2ddf60 RCX: 00007fd68e1cab19
RDX: 00000000200000c0 RSI: 0000000000000004 RDI: 0000000000000004
RBP: 00007fd68e224f6d R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fed8 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd46f0d76f R14: 00007fd68b740300 R15: 0000000000022000