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KASAN: use-after-free Read in v4l2_fh_init
Status: upstream: reported C repro on 2019/04/19 14:36
Reported-by: syzbot+c025d34b8eaa54c571b8@syzkaller.appspotmail.com
First crash: 1133d, last: 16d

Cause bisection: failed (bisect log)
Patch testing requests:
Created Duration User Patch Repo Result
2020/10/18 21:01 17m rkovhaev@gmail.com patch git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git v5.9 OK
2020/10/18 19:51 10m rkovhaev@gmail.com patch git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git v5.9 report log
2020/10/18 16:58 10m rkovhaev@gmail.com patch git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git v5.9 report log
2020/10/11 19:54 9m rkovhaev@gmail.com patch upstream report log
2020/10/11 17:38 9m rkovhaev@gmail.com patch upstream report log
2020/10/11 16:12 9m rkovhaev@gmail.com upstream report log

Sample crash report:
==================================================================
BUG: KASAN: use-after-free in v4l2_fh_init+0x279/0x2c0 drivers/media/v4l2-core/v4l2-fh.c:25
Read of size 8 at addr ffff888026c088c0 by task v4l_id/3922

CPU: 2 PID: 3922 Comm: v4l_id Not tainted 5.17.0-syzkaller-14114-g09bb8856d4a7 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description.constprop.0.cold+0xeb/0x467 mm/kasan/report.c:313
 print_report mm/kasan/report.c:429 [inline]
 kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491
 v4l2_fh_init+0x279/0x2c0 drivers/media/v4l2-core/v4l2-fh.c:25
 v4l2_fh_open+0x88/0xc0 drivers/media/v4l2-core/v4l2-fh.c:63
 em28xx_v4l2_open+0x11c/0x570 drivers/media/usb/em28xx/em28xx-video.c:2163
 v4l2_open+0x21c/0x3f0 drivers/media/v4l2-core/v4l2-dev.c:427
 chrdev_open+0x266/0x770 fs/char_dev.c:414
 do_dentry_open+0x4a1/0x11e0 fs/open.c:824
 do_open fs/namei.c:3476 [inline]
 path_openat+0x1c71/0x2910 fs/namei.c:3609
 do_filp_open+0x1aa/0x400 fs/namei.c:3636
 do_sys_openat2+0x16d/0x4c0 fs/open.c:1213
 do_sys_open fs/open.c:1229 [inline]
 __do_sys_openat fs/open.c:1245 [inline]
 __se_sys_openat fs/open.c:1240 [inline]
 __x64_sys_openat+0x13f/0x1f0 fs/open.c:1240
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f4108f25697
Code: 25 00 00 41 00 3d 00 00 41 00 74 37 64 8b 04 25 18 00 00 00 85 c0 75 5b 44 89 e2 48 89 ee bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 85 00 00 00 48 83 c4 68 5d 41 5c c3 0f 1f
RSP: 002b:00007ffc7b16d980 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000557cbb611c40 RCX: 00007f4108f25697
RDX: 0000000000000000 RSI: 00007ffc7b16df20 RDI: 00000000ffffff9c
RBP: 00007ffc7b16df20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>

Allocated by task 1935:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:436 [inline]
 ____kasan_kmalloc mm/kasan/common.c:515 [inline]
 ____kasan_kmalloc mm/kasan/common.c:474 [inline]
 __kasan_kmalloc+0xa6/0xd0 mm/kasan/common.c:524
 kasan_kmalloc include/linux/kasan.h:234 [inline]
 kmem_cache_alloc_trace+0x1ea/0x4a0 mm/slab.c:3583
 kmalloc include/linux/slab.h:581 [inline]
 kzalloc include/linux/slab.h:714 [inline]
 em28xx_v4l2_init drivers/media/usb/em28xx/em28xx-video.c:2542 [inline]
 em28xx_v4l2_init.cold+0x93/0x329c drivers/media/usb/em28xx/em28xx-video.c:2520
 em28xx_init_extension+0x12f/0x1f0 drivers/media/usb/em28xx/em28xx-core.c:1126
 request_module_async+0x5d/0x70 drivers/media/usb/em28xx/em28xx-cards.c:3415
 process_one_work+0x996/0x1610 kernel/workqueue.c:2289
 worker_thread+0x665/0x1080 kernel/workqueue.c:2436
 kthread+0x2e9/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

Freed by task 1935:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 kasan_set_track+0x21/0x30 mm/kasan/common.c:45
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
 ____kasan_slab_free mm/kasan/common.c:366 [inline]
 ____kasan_slab_free+0x13d/0x180 mm/kasan/common.c:328
 kasan_slab_free include/linux/kasan.h:200 [inline]
 __cache_free mm/slab.c:3439 [inline]
 kfree+0x113/0x310 mm/slab.c:3810
 kref_put.isra.0+0x6f/0xa0 include/linux/kref.h:65
 em28xx_v4l2_init drivers/media/usb/em28xx/em28xx-video.c:2911 [inline]
 em28xx_v4l2_init.cold+0x263/0x329c drivers/media/usb/em28xx/em28xx-video.c:2520
 em28xx_init_extension+0x12f/0x1f0 drivers/media/usb/em28xx/em28xx-core.c:1126
 request_module_async+0x5d/0x70 drivers/media/usb/em28xx/em28xx-cards.c:3415
 process_one_work+0x996/0x1610 kernel/workqueue.c:2289
 worker_thread+0x665/0x1080 kernel/workqueue.c:2436
 kthread+0x2e9/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

Last potentially related work creation:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 __kasan_record_aux_stack+0x7e/0x90 mm/kasan/generic.c:348
 insert_work+0x48/0x350 kernel/workqueue.c:1358
 __queue_work+0x62e/0x1140 kernel/workqueue.c:1517
 queue_work_on+0xee/0x110 kernel/workqueue.c:1545
 queue_work include/linux/workqueue.h:502 [inline]
 schedule_work include/linux/workqueue.h:563 [inline]
 request_modules drivers/media/usb/em28xx/em28xx-cards.c:3435 [inline]
 em28xx_usb_probe.cold+0x15e7/0x258a drivers/media/usb/em28xx/em28xx-cards.c:4099
 usb_probe_interface+0x315/0x7f0 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:541 [inline]
 really_probe+0x23e/0xb20 drivers/base/dd.c:620
 __driver_probe_device+0x338/0x4d0 drivers/base/dd.c:751
 driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:781
 __device_attach_driver+0x20b/0x2f0 drivers/base/dd.c:898
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:427
 __device_attach+0x228/0x4a0 drivers/base/dd.c:969
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:487
 device_add+0xb83/0x1e20 drivers/base/core.c:3405
 usb_set_configuration+0x101e/0x1900 drivers/usb/core/message.c:2170
 usb_generic_driver_probe+0xba/0x100 drivers/usb/core/generic.c:238
 usb_probe_device+0xd9/0x2c0 drivers/usb/core/driver.c:293
 call_driver_probe drivers/base/dd.c:541 [inline]
 really_probe+0x23e/0xb20 drivers/base/dd.c:620
 __driver_probe_device+0x338/0x4d0 drivers/base/dd.c:751
 driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:781
 __device_attach_driver+0x20b/0x2f0 drivers/base/dd.c:898
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:427
 __device_attach+0x228/0x4a0 drivers/base/dd.c:969
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:487
 device_add+0xb83/0x1e20 drivers/base/core.c:3405
 usb_new_device.cold+0x641/0x1091 drivers/usb/core/hub.c:2566
 hub_port_connect drivers/usb/core/hub.c:5363 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5507 [inline]
 port_event drivers/usb/core/hub.c:5665 [inline]
 hub_event+0x25c6/0x4680 drivers/usb/core/hub.c:5747
 process_one_work+0x996/0x1610 kernel/workqueue.c:2289
 process_scheduled_works kernel/workqueue.c:2352 [inline]
 worker_thread+0x854/0x1080 kernel/workqueue.c:2438
 kthread+0x2e9/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

Second to last potentially related work creation:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 __kasan_record_aux_stack+0x7e/0x90 mm/kasan/generic.c:348
 insert_work+0x48/0x350 kernel/workqueue.c:1358
 __queue_work+0x62e/0x1140 kernel/workqueue.c:1517
 queue_work_on+0xee/0x110 kernel/workqueue.c:1545
 queue_work include/linux/workqueue.h:502 [inline]
 schedule_work include/linux/workqueue.h:563 [inline]
 request_modules drivers/media/usb/em28xx/em28xx-cards.c:3435 [inline]
 em28xx_usb_probe.cold+0x15e7/0x258a drivers/media/usb/em28xx/em28xx-cards.c:4099
 usb_probe_interface+0x315/0x7f0 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:541 [inline]
 really_probe+0x23e/0xb20 drivers/base/dd.c:620
 __driver_probe_device+0x338/0x4d0 drivers/base/dd.c:751
 driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:781
 __device_attach_driver+0x20b/0x2f0 drivers/base/dd.c:898
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:427
 __device_attach+0x228/0x4a0 drivers/base/dd.c:969
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:487
 device_add+0xb83/0x1e20 drivers/base/core.c:3405
 usb_set_configuration+0x101e/0x1900 drivers/usb/core/message.c:2170
 usb_generic_driver_probe+0xba/0x100 drivers/usb/core/generic.c:238
 usb_probe_device+0xd9/0x2c0 drivers/usb/core/driver.c:293
 call_driver_probe drivers/base/dd.c:541 [inline]
 really_probe+0x23e/0xb20 drivers/base/dd.c:620
 __driver_probe_device+0x338/0x4d0 drivers/base/dd.c:751
 driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:781
 __device_attach_driver+0x20b/0x2f0 drivers/base/dd.c:898
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:427
 __device_attach+0x228/0x4a0 drivers/base/dd.c:969
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:487
 device_add+0xb83/0x1e20 drivers/base/core.c:3405
 usb_new_device.cold+0x641/0x1091 drivers/usb/core/hub.c:2566
 hub_port_connect drivers/usb/core/hub.c:5363 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5507 [inline]
 port_event drivers/usb/core/hub.c:5665 [inline]
 hub_event+0x25c6/0x4680 drivers/usb/core/hub.c:5747
 process_one_work+0x996/0x1610 kernel/workqueue.c:2289
 process_scheduled_works kernel/workqueue.c:2352 [inline]
 worker_thread+0x854/0x1080 kernel/workqueue.c:2438
 kthread+0x2e9/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

The buggy address belongs to the object at ffff888026c08000
 which belongs to the cache kmalloc-16k of size 16384
The buggy address is located 2240 bytes inside of
 16384-byte region [ffff888026c08000, ffff888026c0c000)

The buggy address belongs to the physical page:
page:ffffea00009b0200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x26c08
head:ffffea00009b0200 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0000935608 ffff888010c41c50 ffff888010c40b00
raw: 0000000000000000 ffff888026c08000 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x2420c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_COMP|__GFP_THISNODE), pid 172, tgid 172 (kworker/0:2), ts 235722124133, free_ts 53421134891
 prep_new_page mm/page_alloc.c:2441 [inline]
 get_page_from_freelist+0xba2/0x3df0 mm/page_alloc.c:4182
 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5408
 __alloc_pages_node include/linux/gfp.h:587 [inline]
 kmem_getpages mm/slab.c:1378 [inline]
 cache_grow_begin+0x75/0x350 mm/slab.c:2584
 cache_alloc_refill+0x27f/0x380 mm/slab.c:2957
 ____cache_alloc mm/slab.c:3040 [inline]
 ____cache_alloc mm/slab.c:3023 [inline]
 __do_cache_alloc mm/slab.c:3267 [inline]
 slab_alloc mm/slab.c:3309 [inline]
 kmem_cache_alloc_trace+0x380/0x4a0 mm/slab.c:3581
 kmalloc include/linux/slab.h:581 [inline]
 kzalloc include/linux/slab.h:714 [inline]
 em28xx_usb_probe+0x215/0xd30 drivers/media/usb/em28xx/em28xx-cards.c:3866
 usb_probe_interface+0x315/0x7f0 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:541 [inline]
 really_probe+0x23e/0xb20 drivers/base/dd.c:620
 __driver_probe_device+0x338/0x4d0 drivers/base/dd.c:751
 driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:781
 __device_attach_driver+0x20b/0x2f0 drivers/base/dd.c:898
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:427
 __device_attach+0x228/0x4a0 drivers/base/dd.c:969
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:487
 device_add+0xb83/0x1e20 drivers/base/core.c:3405
 usb_set_configuration+0x101e/0x1900 drivers/usb/core/message.c:2170
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1356 [inline]
 free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1406
 free_unref_page_prepare mm/page_alloc.c:3328 [inline]
 free_unref_page+0x19/0x690 mm/page_alloc.c:3423
 skb_free_frag include/linux/skbuff.h:3135 [inline]
 skb_free_head+0x96/0x110 net/core/skbuff.c:653
 skb_release_data+0x67a/0x810 net/core/skbuff.c:677
 skb_release_all net/core/skbuff.c:742 [inline]
 __kfree_skb net/core/skbuff.c:756 [inline]
 kfree_skb_reason.part.0+0xc3/0x2f0 net/core/skbuff.c:776
 kfree_skb_reason+0x85/0x110 include/linux/refcount.h:279
 kfree_skb_list_reason net/core/skbuff.c:786 [inline]
 kfree_skb_list include/linux/skbuff.h:1261 [inline]
 skb_release_data+0x6aa/0x810 net/core/skbuff.c:675
 skb_release_all net/core/skbuff.c:742 [inline]
 __kfree_skb+0x46/0x60 net/core/skbuff.c:756
 __sk_defer_free_flush net/ipv4/tcp.c:1601 [inline]
 sk_defer_free_flush include/net/tcp.h:1380 [inline]
 tcp_recvmsg+0x1ca/0x610 net/ipv4/tcp.c:2577
 inet_recvmsg+0x11b/0x5e0 net/ipv4/af_inet.c:850
 sock_recvmsg_nosec net/socket.c:948 [inline]
 sock_recvmsg net/socket.c:966 [inline]
 sock_recvmsg net/socket.c:962 [inline]
 sock_read_iter+0x336/0x470 net/socket.c:1039
 call_read_iter include/linux/fs.h:2044 [inline]
 new_sync_read+0x4f9/0x5f0 fs/read_write.c:401
 vfs_read+0x492/0x5d0 fs/read_write.c:482
 ksys_read+0x1e8/0x250 fs/read_write.c:620
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Memory state around the buggy address:
 ffff888026c08780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888026c08800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888026c08880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff888026c08900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888026c08980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Fix bisection attempts:
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-selinux-root 2022/05/09 13:14 upstream c5eb0a61238d 9a4781d4 .config log report syz C
ci-upstream-kasan-gce-selinux-root 2022/02/13 03:41 upstream b81b1829e7e3 9a4781d4 .config log report syz C
ci-upstream-kasan-gce-selinux-root 2021/12/05 03:25 upstream 79a72162048e 9a4781d4 .config log report syz C
ci-upstream-kasan-gce-selinux-root 2021/11/05 03:04 upstream d4439a1189f9 9a4781d4 .config log report syz C
ci-upstream-kasan-gce-selinux-root 2021/10/04 10:00 upstream 9e1ff307c779 9a4781d4 .config log report syz C
ci-upstream-kasan-gce-selinux-root 2021/08/29 01:05 upstream 3f5ad13cb012 9a4781d4 .config log report syz C
ci-upstream-kasan-gce-selinux-root 2021/05/22 07:48 upstream 45af60e7ced0 98682e5e .config log report syz C
Crashes (301):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-qemu-upstream 2022/04/04 06:07 upstream 09bb8856d4a7 79a2a8fc .config log report syz C KASAN: use-after-free Read in v4l2_fh_init
ci-qemu-upstream 2022/03/26 13:27 upstream cb7cbaae7fd9 89bc8608 .config log report syz C KASAN: use-after-free Read in v4l2_fh_init
ci-qemu-upstream 2022/03/21 16:48 upstream f443e374ae13 e2d91b1d .config log report syz C KASAN: use-after-free Read in v4l2_fh_init
ci-qemu-upstream 2022/03/14 21:38 upstream 09688c0166e7 9e8eaa75 .config log report syz C KASAN: use-after-free Read in v4l2_fh_init
ci-qemu-upstream 2022/03/07 15:07 upstream ffb217a13a2e 7bdd8b2c .config log report syz C KASAN: use-after-free Read in v4l2_fh_init
ci-qemu-upstream 2022/03/07 14:28 upstream ffb217a13a2e 7bdd8b2c .config log report syz C KASAN: use-after-free Read in v4l2_fh_init
ci-upstream-kasan-gce-selinux-root 2021/07/29 09:59 upstream 4010a528219e 9a4781d4 .config log report syz C KASAN: use-after-free Read in v4l2_fh_init
ci-upstream-kasan-gce-selinux-root 2021/07/15 15:31 upstream 8096acd7442e b9a2f64e .config log report syz C KASAN: use-after-free Read in v4l2_fh_init
ci-upstream-kasan-gce-root 2021/06/09 20:21 upstream 368094df48e6 84fe5d96 .config log report syz C KASAN: use-after-free Read in v4l2_fh_init
ci-upstream-kasan-gce-root 2021/06/08 17:13 upstream 614124bea77e b718257f .config log report syz C KASAN: use-after-free Read in v4l2_fh_init
ci-upstream-kasan-gce-root 2021/05/31 17:54 upstream 8124c8a6b353 032639db .config log report syz C KASAN: use-after-free Read in v4l2_fh_init
ci-upstream-kasan-gce-selinux-root 2021/02/15 18:31 upstream f40ddce88593 98682e5e .config log report syz C KASAN: use-after-free Read in v4l2_fh_init
ci-upstream-kasan-gce-root 2021/02/03 18:54 upstream 3aaf0a27ffc2 624dad51 .config log report syz C KASAN: use-after-free Read in v4l2_fh_init
ci-upstream-kasan-gce 2021/02/02 01:10 upstream 1048ba83fb1c e6b95f32 .config log report syz C KASAN: use-after-free Read in v4l2_fh_init
ci-upstream-kasan-gce 2021/01/30 22:28 upstream 0e9bcda5d286 fc9fd31e .config log report syz C KASAN: use-after-free Read in v4l2_fh_init
ci-upstream-linux-next-kasan-gce-root 2021/07/09 16:27 linux-next 92510a7fd93c 281e815f .config log report syz C KASAN: use-after-free Read in v4l2_fh_init
ci-upstream-linux-next-kasan-gce-root 2021/07/05 22:42 linux-next a1f92694393a 55aa55c2 .config log report syz C KASAN: use-after-free Read in v4l2_fh_init
ci-upstream-linux-next-kasan-gce-root 2021/06/25 21:08 linux-next a1f92694393a ae6bf8dd .config log report syz C KASAN: use-after-free Read in v4l2_fh_init
ci-upstream-linux-next-kasan-gce-root 2021/03/31 00:14 linux-next 931294922e65 6a81331a .config log report syz C KASAN: use-after-free Read in v4l2_fh_init
ci-upstream-kasan-gce 2020/11/21 13:42 upstream 27bba9c532a8 68068804 .config log report syz C
ci2-upstream-usb 2021/01/05 15:27 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing ed054e4e95d6 a0234d98 .config log report syz C
ci2-upstream-usb 2020/12/24 19:12 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing 3644e2d2dda7 c2c1d1dd .config log report syz C
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