8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f29 when write [fee04f29] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 17833 Comm: syz.5.3334 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 : dfa31d30 ip : dfa31d30 fp : dfa31d54 r10: 82b16f00 r9 : 00000003 r8 : 840e0540 r7 : dfa31d90 r6 : 840e0540 r5 : 00000000 r4 : 00000000 r3 : fee04f29 r2 : 81e15444 r1 : 00000001 r0 : 813aac78 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 86fe6480 DAC: fffffffd 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 840e0540 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfa30000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 840e0540 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 0xdfa30000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfa30000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.5.3334 (pid: 17833, stack limit = 0xdfa30000) Stack: (0xdfa31d30 to 0xdfa32000) 1d20: 823fe320 840e0540 829cf8ec 829cf8ec 1d40: 81e15904 840e0584 dfa31d8c dfa31d58 813a70a0 813aaea0 20000280 00000000 1d60: dfa31d7c 20000280 840e0540 b5403587 20000280 83bf6c00 40946400 00000003 1d80: dfa31e4c dfa31d90 813a2c20 813a6fa4 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00004f29 000003ff 000003ff 00000601 00000001 00000cc7 00000ffe 1dc0: 5c952399 00000805 000007ff 00000002 00000001 00000002 00000004 00000001 1de0: 0000e1cb 00000005 0001a44b 00000003 00000201 00000be8 fffffff9 00000009 1e00: 20001e57 00000009 00000003 0000003c 00000008 00000004 08000000 00000001 1e20: 00000000 327852ea 00000000 86cb73c0 840e0540 20000280 20000280 83bf6c00 1e40: dfa31f14 dfa31e50 813a3bec 813a2b2c 00000000 00000000 00000000 327852ea 1e60: 00000000 00000000 8247054c 0000005f 83cab258 840e0570 8410e5f4 83bf6c00 1e80: dfa31ee4 dfa31e90 8079795c 8078dcc0 00000064 00000001 00000000 dfa31eac 1ea0: 84698310 8341aa18 00006400 0000000b dfa31ea0 00000000 00000000 327852ea 1ec0: 86cb73c0 40946400 20000280 20000280 86cb73c0 00000003 dfa31ef4 dfa31ee8 1ee0: 80797a7c 327852ea dfa31f14 40946400 00000000 86cb73c1 20000280 86cb73c0 1f00: 00000003 83bf6c00 dfa31fa4 dfa31f18 8056cf18 813a361c ecac8b10 83bf6c00 1f20: dfa31f3c dfa31f30 81a388b8 81a38788 dfa31f54 dfa31f40 8025e490 8028ef8c 1f40: dfa31fb0 40000000 dfa31f84 dfa31f58 802229ec 8025e44c 00000000 8281cddc 1f60: dfa31fb0 0014c820 ecac8b10 80222940 00000000 327852ea dfa31fac 00000000 1f80: 00000000 002f6308 00000036 8020029c 83bf6c00 00000036 00000000 dfa31fa8 1fa0: 80200060 8056cdf4 00000000 00000000 00000003 40946400 20000280 00000000 1fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76f080bc 1fe0: 76f07ec0 76f07eb0 0001948c 001322c0 60000010 00000003 00000000 00000000 Call trace: [<813aae94>] (parport_attach) from [<813a70a0>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1006) r6:840e0584 r5:81e15904 r4:829cf8ec [<813a6f98>] (comedi_device_attach) from [<813a2c20>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:83bf6c00 r7:20000280 r6:b5403587 r5:840e0540 r4:20000280 [<813a2b20>] (do_devconfig_ioctl) from [<813a3bec>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2173) r8:83bf6c00 r7:20000280 r6:20000280 r5:840e0540 r4:86cb73c0 [<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) r10:83bf6c00 r9:00000003 r8:86cb73c0 r7:20000280 r6:86cb73c1 r5:00000000 r4:40946400 [<8056cde8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa31fa8 to 0xdfa31ff0) 1fa0: 00000000 00000000 00000003 40946400 20000280 00000000 1fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76f080bc 1fe0: 76f07ec0 76f07eb0 0001948c 001322c0 r10:00000036 r9:83bf6c00 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