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: 16706 Comm: syz.5.737 Not tainted 6.17.0-rc1-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 : [<813ab008>] lr : [<813aaff8>] psr: 60000013 sp : dfac5d30 ip : dfac5d30 fp : dfac5d54 r10: 82b16f00 r9 : 00000003 r8 : 8412b6c0 r7 : dfac5d90 r6 : 8412b6c0 r5 : 00000000 r4 : 00000000 r3 : fee02f00 r2 : 81e15444 r1 : 00000001 r0 : 813aac78 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8609e880 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 8412b6c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfac4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 8412b6c0 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 0xdfac4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfac4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.5.737 (pid: 16706, stack limit = 0xdfac4000) Stack: (0xdfac5d30 to 0xdfac6000) 5d20: 823fe320 8412b6c0 829cf8ec 829cf8ec 5d40: 81e15904 8412b704 dfac5d8c dfac5d58 813a70a0 813aaea0 20000300 00000000 5d60: dfac5d7c 20000300 8412b6c0 b5403587 20000300 85e24800 40946400 00000001 5d80: dfac5e4c dfac5d90 813a2c20 813a6fa4 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00002f00 00000005 0000d09a ffffffff 00000003 fffffffe 20000004 5dc0: 00000003 00000ffe 7fffffff 0000000c 00000002 00000004 00000008 0000ffff 5de0: 00000006 00000005 000007ff 00000830 00000008 00010000 00000009 00000800 5e00: 00000101 00000002 00008001 00000007 00000003 00000004 00000005 0000070f 5e20: 00000000 e02c79f6 00000000 84d6fa80 8412b6c0 20000300 20000300 85e24800 5e40: dfac5f14 dfac5e50 813a3bec 813a2b2c 00000000 00000000 00000000 e02c79f6 5e60: 00000000 00000000 8247054c 0000005f 8418c458 8412b6f0 841d7abc 85e24800 5e80: dfac5ee4 dfac5e90 8079795c 8078dcc0 00000064 00000001 00000000 dfac5eac 5ea0: 861daa90 834ea198 00006400 0000000b dfac5ea0 00000000 00000000 e02c79f6 5ec0: 84d6fa80 40946400 20000300 20000300 84d6fa80 00000003 dfac5ef4 dfac5ee8 5ee0: 80797a7c e02c79f6 dfac5f14 40946400 00000000 84d6fa81 20000300 84d6fa80 5f00: 00000003 85e24800 dfac5fa4 dfac5f18 8056cf18 813a361c ecac8b10 85e24800 5f20: dfac5f3c dfac5f30 81a388b8 81a38788 dfac5f54 dfac5f40 8025e490 8028ef8c 5f40: dfac5fb0 40000000 dfac5f84 dfac5f58 802229ec 8025e44c 00000000 8281cddc 5f60: dfac5fb0 0014c820 ecac8b10 80222940 00000000 e02c79f6 dfac5fac 00000000 5f80: 00000000 002f6308 00000036 8020029c 85e24800 00000036 00000000 dfac5fa8 5fa0: 80200060 8056cdf4 00000000 00000000 00000003 40946400 20000300 00000000 5fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76f0f0bc 5fe0: 76f0eec0 76f0eeb0 0001948c 001322c0 60000010 00000003 00000000 00000000 Call trace: [<813aae94>] (parport_attach) from [<813a70a0>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1006) r6:8412b704 r5:81e15904 r4:829cf8ec [<813a6f98>] (comedi_device_attach) from [<813a2c20>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000001 r9:40946400 r8:85e24800 r7:20000300 r6:b5403587 r5:8412b6c0 r4:20000300 [<813a2b20>] (do_devconfig_ioctl) from [<813a3bec>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2173) r8:85e24800 r7:20000300 r6:20000300 r5:8412b6c0 r4:84d6fa80 [<813a3610>] (comedi_unlocked_ioctl) from [<8056cf18>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a3610>] (comedi_unlocked_ioctl) from [<8056cf18>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a3610>] (comedi_unlocked_ioctl) from [<8056cf18>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a3610>] (comedi_unlocked_ioctl) from [<8056cf18>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:85e24800 r9:00000003 r8:84d6fa80 r7:20000300 r6:84d6fa81 r5:00000000 r4:40946400 [<8056cde8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfac5fa8 to 0xdfac5ff0) 5fa0: 00000000 00000000 00000003 40946400 20000300 00000000 5fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76f0f0bc 5fe0: 76f0eec0 76f0eeb0 0001948c 001322c0 r10:00000036 r9:85e24800 r8:8020029c r7:00000036 r6:002f6308 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