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: 23850 Comm: syz.4.4718 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: ARM-Versatile Express PC is at __raw_writeb arch/arm/include/asm/io.h:99 [inline] PC is at parport_attach drivers/comedi/drivers/comedi_parport.c:243 [inline] PC is at parport_attach+0x5c/0x1e8 drivers/comedi/drivers/comedi_parport.c:231 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:243 [inline] LR is at parport_attach+0x50/0x1e8 drivers/comedi/drivers/comedi_parport.c:231 pc : [<814d6920>] lr : [<814d6914>] psr: 60000013 sp : dfa51d30 ip : dfa51d30 fp : dfa51d54 r10: 82d307a0 r9 : 00000003 r8 : 8312de40 r7 : dfa51d90 r6 : dfa51d90 r5 : 8312de40 r4 : 00000000 r3 : fee02f00 r2 : 00000000 r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 86db5d40 DAC: 00000000 Register r0 information: NULL pointer Register r1 information: NULL pointer Register r2 information: NULL pointer Register r3 information: 0-page vmalloc region starting at 0xfee00000 allocated at pci_reserve_io+0x0/0x38 arch/arm/mm/mmu.c:1048 Register r4 information: NULL pointer Register r5 information: slab kmalloc-192 start 8312de40 pointer offset 0 size 192 Register r6 information: 2-page vmalloc region starting at 0xdfa50000 allocated at kernel_clone+0xc4/0x440 kernel/fork.c:2771 Register r7 information: 2-page vmalloc region starting at 0xdfa50000 allocated at kernel_clone+0xc4/0x440 kernel/fork.c:2771 Register r8 information: slab kmalloc-192 start 8312de40 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 0xdfa50000 allocated at kernel_clone+0xc4/0x440 kernel/fork.c:2771 Register r12 information: 2-page vmalloc region starting at 0xdfa50000 allocated at kernel_clone+0xc4/0x440 kernel/fork.c:2771 Process syz.4.4718 (pid: 23850, stack limit = 0xdfa50000) Stack: (0xdfa51d30 to 0xdfa52000) 1d20: ffffffff 00000004 82bd8280 81e32f28 1d40: 00000000 dfa51d90 dfa51d8c dfa51d58 814d25b0 814d68d0 40946400 00000000 1d60: dfa51d7c 20000300 8312de40 b5403587 40946400 00000001 00000003 840f8c80 1d80: dfa51e4c dfa51d90 814cddb4 814d24b4 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00002f00 00000005 0000d09a ffffffff 00000003 fffffffe 20000000 1dc0: 00000003 00000d6f 7fffffff 0000000c 00000002 00000004 00000008 00000008 1de0: 00000006 00000005 000007ff 00000830 00000008 00010000 00000006 00000800 1e00: 00000101 00000002 00008001 00000007 00000003 00000004 00000005 0000070f 1e20: 00000000 51506d5a 00000000 838a7800 8312de40 20000300 40946400 00000001 1e40: dfa51f14 dfa51e50 814cf0dc 814cdcf4 00000000 51506d5a 00000000 00000000 1e60: 8252884c dfa51ea4 0000005f 841b4b68 00000064 8312de70 dfa51ee4 dfa51e88 1e80: 80829884 8081fc10 00000064 00000001 00000000 dfa51ea4 85cc4610 8342a6e8 1ea0: 00006400 0000000b dfa51e98 00000000 00000000 51506d5a 8035bec8 838a7800 1ec0: 40946400 20000300 20000300 838a7800 00000003 840f8c80 dfa51ef4 dfa51ee8 1ee0: 808299b8 51506d5a dfa51f14 00000000 838a7801 40946400 20000300 838a7800 1f00: 00000003 840f8c80 dfa51fa4 dfa51f18 805d153c 814ced94 ecac8b10 840f8c80 1f20: dfa51f3c dfa51f30 81baca40 81bac90c dfa51f54 dfa51f40 8025b9d4 8028f744 1f40: dfa51fb0 40000000 dfa51f84 dfa51f58 80221bdc 8025b98c 00000000 82a1a04c 1f60: dfa51fb0 0013ec60 ecac8b10 80221b30 00000000 51506d5a dfa51fac 00000000 1f80: 00000000 00356310 00000036 8020029c 840f8c80 00000036 00000000 dfa51fa8 1fa0: 80200060 805d1304 00000000 00000000 00000003 40946400 20000300 00000000 1fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f4b0dc 1fe0: 76f4ae88 76f4ae78 00019004 00130ac0 60000010 00000003 00000000 00000000 Call trace: [<814d68c4>] (parport_attach) from [<814d25b0>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r7:dfa51d90 r6:00000000 r5:81e32f28 r4:82bd8280 [<814d24a8>] (comedi_device_attach) from [<814cddb4>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:840f8c80 r9:00000003 r8:00000001 r7:40946400 r6:b5403587 r5:8312de40 r4:20000300 [<814cdce8>] (do_devconfig_ioctl) from [<814cf0dc>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000001 r7:40946400 r6:20000300 r5:8312de40 r4:838a7800 [<814ced88>] (comedi_unlocked_ioctl) from [<805d153c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<814ced88>] (comedi_unlocked_ioctl) from [<805d153c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<814ced88>] (comedi_unlocked_ioctl) from [<805d153c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<814ced88>] (comedi_unlocked_ioctl) from [<805d153c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:840f8c80 r9:00000003 r8:838a7800 r7:20000300 r6:40946400 r5:838a7801 r4:00000000 [<805d12f8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa51fa8 to 0xdfa51ff0) 1fa0: 00000000 00000000 00000003 40946400 20000300 00000000 1fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f4b0dc 1fe0: 76f4ae88 76f4ae78 00019004 00130ac0 r10:00000036 r9:840f8c80 r8:8020029c r7:00000036 r6:00356310 r5:00000000 r4:00000000 Code: ebb57ccd e5953064 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: ebb57ccd bl 0xfed5f33c 4: e5953064 ldr r3, [r5, #100] @ 0x64 8: e7f33053 ubfx r3, r3, #0, #20 c: e2433612 sub r3, r3, #18874368 @ 0x1200000 * 10: e5c34000 strb r4, [r3] <-- trapping instruction