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Fri, 26 Jun 2026 14:27:09 -0700 (PDT) Message-ID: <6a3eeead.7fb353d3.354599.b0b0@mx.google.com> Date: Fri, 26 Jun 2026 14:27:09 -0700 (PDT) Subject: WARNING in usb_free_urb To: vbabka@suse.cz, akpm@linux-foundation.org, cl@gentwo.org, rientjes@google.com, roman.gushchin@linux.dev, harry.yoo@oracle.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: syzkaller@googlegroups.com, contact@pgazz.com Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: sanan.hasanou@gmail.com Good day, dear maintainers, We found a bug using a modified version of syzkaller. Kernel Branch: 7.0-rc1 Kernel Config: Unfortunately, we don't have any reproducer for this bug yet. Thank you! Best regards, Sanan Hasanov 179683 pages reserved 0 pages cma reserved Memory cgroup min protection 0kB -- low protection 0kB ------------[ cut here ]------------ !PageLargeKmalloc(page) WARNING: mm/slub.c:6352 at free_large_kmalloc+0xb3/0x160 mm/slub.c:6352, CPU#1: kworker/1:4/12317 Modules linked in: CPU: 1 UID: 0 PID: 12317 Comm: kworker/1:4 Tainted: G L 7.0.0-rc1 #1 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Workqueue: events request_module_async RIP: 0010:free_large_kmalloc+0xb3/0x160 mm/slub.c:6352 Code: 25 00 00 00 ff 3d 00 00 00 f8 0f 85 a6 00 00 00 c7 43 30 ff ff ff ff 48 89 df 44 89 f6 e8 45 d9 fc ff 5b 41 5e 41 5f 5d c3 90 <0f> 0b 90 48 89 df 48 c7 c6 b7 4c 72 8d e8 cb e8 08 ff eb e4 90 0f RSP: 0018:ffffc900028e76f8 EFLAGS: 00010287 RAX: 00000000f0000000 RBX: ffffea00019a5c00 RCX: ffff888067550001 RDX: 0000000000000000 RSI: ffff888066970000 RDI: ffffea00019a5c00 RBP: ffffc900028e7710 R08: ffff888049c40603 R09: 1ffff110093880c0 R10: dffffc0000000000 R11: ffffed10093880c1 R12: ffff888066970000 R13: ffffffff870bc0f1 R14: 0000000000000000 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880ef136000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fba7e4bf008 CR3: 000000005776b000 CR4: 00000000000006f0 Call Trace: kfree+0xae/0x630 mm/slub.c:6437 urb_destroy drivers/usb/core/urb.c:25 [inline] kref_put include/linux/kref.h:65 [inline] usb_free_urb+0xd1/0x120 drivers/usb/core/urb.c:96 em28xx_uninit_usb_xfer+0x165/0x310 drivers/media/usb/em28xx/em28xx-core.c:833 em28xx_alloc_urbs+0xf2a/0x1130 drivers/media/usb/em28xx/em28xx-core.c:-1 em28xx_dvb_init+0x2b0/0x4a20 drivers/media/usb/em28xx/em28xx-dvb.c:-1 em28xx_init_extension+0x121/0x1d0 drivers/media/usb/em28xx/em28xx-core.c:1117 request_module_async+0x5e/0x80 drivers/media/usb/em28xx/em28xx-cards.c:3457 process_one_work kernel/workqueue.c:3275 [inline] process_scheduled_works+0xae1/0x1800 kernel/workqueue.c:3358 worker_thread+0xa0f/0xf70 kernel/workqueue.c:3439 kthread+0x37d/0x470 kernel/kthread.c:467 ret_from_fork+0x507/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:245 <<<<<<<<<<<<<<< tail report >>>>>>>>>>>>>>> Modules linked in: CPU: 1 UID: 0 PID: 12317 Comm: kworker/1:4 Tainted: G L 7.0.0-rc1 #1 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Workqueue: events request_module_async RIP: 0010:free_large_kmalloc+0xb3/0x160 Code: 25 00 00 00 ff 3d 00 00 00 f8 0f 85 a6 00 00 00 c7 43 30 ff ff ff ff 48 89 df 44 89 f6 e8 45 d9 fc ff 5b 41 5e 41 5f 5d c3 90 <0f> 0b 90 48 89 df 48 c7 c6 b7 4c 72 8d e8 cb e8 08 ff eb e4 90 0f RSP: 0018:ffffc900028e76f8 EFLAGS: 00010287 RAX: 00000000f0000000 RBX: ffffea00019a5c00 RCX: ffff888067550001 RDX: 0000000000000000 RSI: ffff888066970000 RDI: ffffea00019a5c00 RBP: ffffc900028e7710 R08: ffff888049c40603 R09: 1ffff110093880c0 R10: dffffc0000000000 R11: ffffed10093880c1 R12: ffff888066970000 R13: ffffffff870bc0f1 R14: 0000000000000000 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880ef136000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fba7e4bf008 CR3: 000000005776b000 CR4: 00000000000006f0 Call Trace: kfree+0xae/0x630 usb_free_urb+0xd1/0x120 em28xx_uninit_usb_xfer+0x165/0x310 em28xx_alloc_urbs+0xf2a/0x1130 em28xx_dvb_init+0x2b0/0x4a20 em28xx_init_extension+0x121/0x1d0 request_module_async+0x5e/0x80 process_scheduled_works+0xae1/0x1800 worker_thread+0xa0f/0xf70 kthread+0x37d/0x470 ret_from_fork+0x507/0xb90 ret_from_fork_asm+0x11/0x20 Kernel panic - not syncing: kernel: panic_on_warn set ... CPU: 1 UID: 0 PID: 12317 Comm: kworker/1:4 Tainted: G L 7.0.0-rc1 #1 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Workqueue: events request_module_async Call Trace: __dump_stack+0x21/0x30 dump_stack_lvl+0x2b/0x150 dump_stack+0x19/0x20 vpanic+0x53e/0xa20 panic+0xb9/0xc0 __warn+0x320/0x500 __report_bug+0x28d/0x500 report_bug+0x175/0x220 handle_bug+0x9c/0x200 exc_invalid_op+0x1f/0x50 asm_exc_invalid_op+0x1f/0x30 RIP: 0010:free_large_kmalloc+0xb3/0x160 Code: 25 00 00 00 ff 3d 00 00 00 f8 0f 85 a6 00 00 00 c7 43 30 ff ff ff ff 48 89 df 44 89 f6 e8 45 d9 fc ff 5b 41 5e 41 5f 5d c3 90 <0f> 0b 90 48 89 df 48 c7 c6 b7 4c 72 8d e8 cb e8 08 ff eb e4 90 0f RSP: 0018:ffffc900028e76f8 EFLAGS: 00010287 RAX: 00000000f0000000 RBX: ffffea00019a5c00 RCX: ffff888067550001 RDX: 0000000000000000 RSI: ffff888066970000 RDI: ffffea00019a5c00 RBP: ffffc900028e7710 R08: ffff888049c40603 R09: 1ffff110093880c0 R10: dffffc0000000000 R11: ffffed10093880c1 R12: ffff888066970000 R13: ffffffff870bc0f1 R14: 0000000000000000 R15: dffffc0000000000 kfree+0xae/0x630 usb_free_urb+0xd1/0x120 em28xx_uninit_usb_xfer+0x165/0x310 em28xx_alloc_urbs+0xf2a/0x1130 em28xx_dvb_init+0x2b0/0x4a20 em28xx_init_extension+0x121/0x1d0 request_module_async+0x5e/0x80 process_scheduled_works+0xae1/0x1800 worker_thread+0xa0f/0xf70 kthread+0x37d/0x470 ret_from_fork+0x507/0xb90 ret_from_fork_asm+0x11/0x20 Kernel Offset: disabled Rebooting in 86400 seconds.. <<<<<<<<<<<<<<< tail report >>>>>>>>>>>>>>>