8<--- cut here --- Unable to handle kernel paging request at virtual address fee02f00 when write [fee02f00] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 12024 Comm: syz.9.1496 Not tainted 6.16.0-syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at __raw_writeb arch/arm/include/asm/io.h:88 [inline] PC is at parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] PC is at parport_attach+0x174/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] LR is at parport_attach+0x164/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 pc : [<813aab88>] lr : [<813aab78>] psr: 60000013 sp : dfa59d30 ip : dfa59d30 fp : dfa59d54 r10: 82b1ef00 r9 : 00000003 r8 : 83c1ab40 r7 : dfa59d90 r6 : 83c1ab40 r5 : 00000000 r4 : 00000000 r3 : fee02f00 r2 : 81e16524 r1 : 00000001 r0 : 813aa7f8 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8577a480 DAC: 00000000 Register r0 information: non-slab/vmalloc memory Register r1 information: non-paged memory Register r2 information: non-slab/vmalloc memory Register r3 information: 0-page vmalloc region starting at 0xfee00000 allocated at pci_reserve_io+0x0/0x38 arch/arm/mm/mmu.c:1055 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 83c1ab40 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfa58000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2603 Register r8 information: slab kmalloc-192 start 83c1ab40 pointer offset 0 size 192 Register r9 information: non-paged memory Register r10 information: non-slab/vmalloc memory Register r11 information: 2-page vmalloc region starting at 0xdfa58000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2603 Register r12 information: 2-page vmalloc region starting at 0xdfa58000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2603 Process syz.9.1496 (pid: 12024, stack limit = 0xdfa58000) Stack: (0xdfa59d30 to 0xdfa5a000) 9d20: 823fee60 83c1ab40 829cf8ec 829cf8ec 9d40: 81e169e4 83c1ab84 dfa59d8c dfa59d58 813a6c20 813aaa20 20000300 00000000 9d60: dfa59d7c 20000300 83c1ab40 b5403587 20000300 833abc00 40946400 00000001 9d80: dfa59e4c dfa59d90 813a27a0 813a6b24 656d6f63 705f6964 6f707261 00007472 9da0: 00000000 00002f00 00000005 0000d09a ffffffff 00000003 fffffffe 20000004 9dc0: 00000003 00000ffe 7fffffff 0000000c 00000002 00000004 00000008 0000ffff 9de0: 00000006 00000005 000007ff 00000830 00000008 00010000 00000009 00000800 9e00: 00000101 00000002 00008001 00000007 00000003 00000004 00000005 0000070f 9e20: 00000000 fb7df993 00000000 833319c0 83c1ab40 20000300 20000300 833abc00 9e40: dfa59f14 dfa59e50 813a376c 813a26ac 00000000 00000000 00000000 fb7df993 9e60: 00000000 00000000 8247154c 0000005f 83cbd258 83c1ab70 841eddd4 833abc00 9e80: dfa59ee4 dfa59e90 80797ac4 8078de28 00000064 00000001 00000000 dfa59eac 9ea0: 8637e0d0 834ee5d8 00006400 0000000b dfa59ea0 00000000 00000000 fb7df993 9ec0: 833319c0 40946400 20000300 20000300 833319c0 00000003 dfa59ef4 dfa59ee8 9ee0: 80797be4 fb7df993 dfa59f14 40946400 00000000 833319c1 20000300 833319c0 9f00: 00000003 833abc00 dfa59fa4 dfa59f18 8056d11c 813a319c ecac8b10 833abc00 9f20: dfa59f3c dfa59f30 81a38084 81a37f54 dfa59f54 dfa59f40 8025e400 8028eefc 9f40: dfa59fb0 40000000 dfa59f84 dfa59f58 802229ec 8025e3bc 00000000 8281cddc 9f60: dfa59fb0 0014c750 ecac8b10 80222940 00000000 fb7df993 dfa59fac 00000000 9f80: 00000000 002f6300 00000036 8020029c 833abc00 00000036 00000000 dfa59fa8 9fa0: 80200060 8056cff8 00000000 00000000 00000003 40946400 20000300 00000000 9fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76bf80bc 9fe0: 76bf7ec0 76bf7eb0 000193dc 001321f0 60000010 00000003 00000000 00000000 Call trace: [<813aaa14>] (parport_attach) from [<813a6c20>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1006) r6:83c1ab84 r5:81e169e4 r4:829cf8ec [<813a6b18>] (comedi_device_attach) from [<813a27a0>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000001 r9:40946400 r8:833abc00 r7:20000300 r6:b5403587 r5:83c1ab40 r4:20000300 [<813a26a0>] (do_devconfig_ioctl) from [<813a376c>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2173) r8:833abc00 r7:20000300 r6:20000300 r5:83c1ab40 r4:833319c0 [<813a3190>] (comedi_unlocked_ioctl) from [<8056d11c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a3190>] (comedi_unlocked_ioctl) from [<8056d11c>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a3190>] (comedi_unlocked_ioctl) from [<8056d11c>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a3190>] (comedi_unlocked_ioctl) from [<8056d11c>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:833abc00 r9:00000003 r8:833319c0 r7:20000300 r6:833319c1 r5:00000000 r4:40946400 [<8056cfec>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa59fa8 to 0xdfa59ff0) 9fa0: 00000000 00000000 00000003 40946400 20000300 00000000 9fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76bf80bc 9fe0: 76bf7ec0 76bf7eb0 000193dc 001321f0 r10:00000036 r9:833abc00 r8:8020029c r7:00000036 r6:002f6300 r5:00000000 r4:00000000 Code: e596306c e3a04000 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e596306c ldr r3, [r6, #108] @ 0x6c 4: e3a04000 mov r4, #0 8: e7f33053 ubfx r3, r3, #0, #20 c: e2433612 sub r3, r3, #18874368 @ 0x1200000 * 10: e5c34000 strb r4, [r3] <-- trapping instruction