8<--- cut here --- Unable to handle kernel paging request at virtual address fee00140 when write [fee00140] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 13207 Comm: syz.6.2002 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:291 [inline] PC is at parport_attach+0x184/0x1e0 drivers/comedi/drivers/comedi_parport.c:224 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:291 [inline] LR is at parport_attach+0x174/0x1e0 drivers/comedi/drivers/comedi_parport.c:224 pc : [<81492d74>] lr : [<81492d64>] psr: 60000013 sp : dfae1d30 ip : dfae1d30 fp : dfae1d54 r10: 82d30dfc r9 : 00000003 r8 : 847b6300 r7 : dfae1d90 r6 : 847b6300 r5 : 00000000 r4 : 00000000 r3 : fee00140 r2 : 81e2dd68 r1 : 00000001 r0 : 814929d4 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 863a7200 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:1048 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 847b6300 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfae0000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r8 information: slab kmalloc-192 start 847b6300 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 0xdfae0000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r12 information: 2-page vmalloc region starting at 0xdfae0000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Process syz.6.2002 (pid: 13207, stack limit = 0xdfae0000) Stack: (0xdfae1d30 to 0xdfae2000) 1d20: 824d45f4 847b6300 82bd8e60 82bd8e60 1d40: 81e2e228 00000000 dfae1d8c dfae1d58 8148e8f0 81492bfc 40946400 00000000 1d60: dfae1d7c 200003c0 847b6300 b5403587 40946400 00000002 00000003 83fe3d40 1d80: dfae1e4c dfae1d90 8148a0f4 8148e7f4 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00000140 fffffffc 0001000c 0000dddc 00000000 00010000 00007fff 1dc0: 00000006 00000007 0000c72c 02000004 0000000f 0000c000 00000008 000004ce 1de0: 00000009 00000001 000000ad 00000006 00000008 00000004 00000000 0000000a 1e00: 00000009 00000ffd 00000009 000000af 00000002 00000283 00008001 0000e43f 1e20: 00000000 9ffba21c 00000000 86514e80 847b6300 200003c0 40946400 00000002 1e40: dfae1f14 dfae1e50 8148b41c 8148a034 00000000 9ffba21c 00000000 00000000 1e60: 8254980c dfae1ea4 0000005f 8434bdd8 00000064 847b6330 dfae1ee4 dfae1e88 1e80: 80806188 807fc404 00000064 00000001 00000000 dfae1ea4 86538510 8342c660 1ea0: 00006400 0000000b dfae1e98 00000000 00000000 9ffba21c 00000000 86514e80 1ec0: 40946400 200003c0 200003c0 86514e80 00000003 83fe3d40 dfae1ef4 dfae1ee8 1ee0: 808062bc 9ffba21c dfae1f14 00000000 86514e81 40946400 200003c0 86514e80 1f00: 00000003 83fe3d40 dfae1fa4 dfae1f18 805bab28 8148b0d4 ecac8b10 83fe3d40 1f20: dfae1f3c dfae1f30 81b576c0 81b5758c dfae1f54 dfae1f40 8025a7a8 8028e490 1f40: dfae1fb0 40000000 dfae1f84 dfae1f58 80220bdc 8025a764 00000000 82a1eb0c 1f60: dfae1fb0 0013e9c0 ecac8b10 80220b30 00000000 9ffba21c dfae1fac 00000000 1f80: 00000000 00356310 00000036 8020029c 83fe3d40 00000036 00000000 dfae1fa8 1fa0: 80200060 805ba8f0 00000000 00000000 00000003 40946400 200003c0 00000000 1fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76fd90dc 1fe0: 76fd8e88 76fd8e78 00018ebc 00130820 60000010 00000003 00000000 00000000 Call trace: [<81492bf0>] (parport_attach) from [<8148e8f0>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e2e228 r4:82bd8e60 [<8148e7e8>] (comedi_device_attach) from [<8148a0f4>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:83fe3d40 r9:00000003 r8:00000002 r7:40946400 r6:b5403587 r5:847b6300 r4:200003c0 [<8148a028>] (do_devconfig_ioctl) from [<8148b41c>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000002 r7:40946400 r6:200003c0 r5:847b6300 r4:86514e80 [<8148b0c8>] (comedi_unlocked_ioctl) from [<805bab28>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8148b0c8>] (comedi_unlocked_ioctl) from [<805bab28>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8148b0c8>] (comedi_unlocked_ioctl) from [<805bab28>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8148b0c8>] (comedi_unlocked_ioctl) from [<805bab28>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:83fe3d40 r9:00000003 r8:86514e80 r7:200003c0 r6:40946400 r5:86514e81 r4:00000000 [<805ba8e4>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfae1fa8 to 0xdfae1ff0) 1fa0: 00000000 00000000 00000003 40946400 200003c0 00000000 1fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76fd90dc 1fe0: 76fd8e88 76fd8e78 00018ebc 00130820 r10:00000036 r9:83fe3d40 r8:8020029c r7:00000036 r6:00356310 r5:00000000 r4:00000000 Code: e5963064 e3a04000 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e5963064 ldr r3, [r6, #100] @ 0x64 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