8<--- cut here --- Unable to handle kernel paging request at virtual address fee00300 when write [fee00300] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 18225 Comm: syz.5.2694 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 : [<8147b7bc>] lr : [<8147b7ac>] psr: 60000013 sp : dfce1d30 ip : dfce1d30 fp : dfce1d54 r10: 82d2c99c r9 : 00000003 r8 : 846d0180 r7 : dfce1d90 r6 : 846d0180 r5 : 00000000 r4 : 00000000 r3 : fee00300 r2 : 81e2d3a8 r1 : 00000001 r0 : 8147b41c Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 871675c0 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 846d0180 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfce0000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2746 Register r8 information: slab kmalloc-192 start 846d0180 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 0xdfce0000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2746 Register r12 information: 2-page vmalloc region starting at 0xdfce0000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2746 Process syz.5.2694 (pid: 18225, stack limit = 0xdfce0000) Stack: (0xdfce1d30 to 0xdfce2000) 1d20: 824cbc8c 846d0180 82bd64c4 82bd64c4 1d40: 81e2d868 00000000 dfce1d8c dfce1d58 81477338 8147b644 40946400 00000000 1d60: dfce1d7c 20000440 846d0180 b5403587 40946400 00000001 00000003 840b8000 1d80: dfce1e4c dfce1d90 81472b44 8147723c 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00000300 80000000 00000005 00000400 00000007 00800005 00000007 1dc0: 00000008 00000006 00000005 ffffffff 00000009 00000001 fffffffc 0010000b 1de0: 00000003 00000005 0004007a 00000003 00000003 00000089 00000012 0000007f 1e00: 00000002 00000001 00000e66 00000001 00000006 0000a6b5 00000004 00000005 1e20: 00000000 018fdb1b 00000000 87055f00 846d0180 20000440 40946400 00000001 1e40: dfce1f14 dfce1e50 81473e68 81472a7c 00000000 018fdb1b 00000000 00000000 1e60: 8254080c dfce1ea4 0000005f 84346990 00000064 846d01b0 dfce1ee4 dfce1e88 1e80: 80802f88 807f92b8 00000064 00000001 00000000 dfce1ea4 87035a10 8343c440 1ea0: 00006400 0000000b dfce1e98 00000000 00000000 018fdb1b 80357ec4 87055f00 1ec0: 40946400 20000440 20000440 87055f00 00000003 840b8000 dfce1ef4 dfce1ee8 1ee0: 808030bc 018fdb1b dfce1f14 00000000 87055f01 40946400 20000440 87055f00 1f00: 00000003 840b8000 dfce1fa4 dfce1f18 805b9fc0 81473b20 ecac8b10 840b8000 1f20: dfce1f3c dfce1f30 81b3e3a0 81b3e26c dfce1f54 dfce1f40 8025a7f0 8028e4c8 1f40: dfce1fb0 40000000 dfce1f84 dfce1f58 80220bdc 8025a7ac 00000000 82a1ea8c 1f60: dfce1fb0 0013e9c0 ecac8b10 80220b30 00000000 018fdb1b dfce1fac 00000000 1f80: 00000000 00346310 00000036 8020029c 840b8000 00000036 00000000 dfce1fa8 1fa0: 80200060 805b9d88 00000000 00000000 00000003 40946400 20000440 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76ff30dc 1fe0: 76ff2e88 76ff2e78 00018ebc 00130820 60000010 00000003 00000000 00000000 Call trace: [<8147b638>] (parport_attach) from [<81477338>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e2d868 r4:82bd64c4 [<81477230>] (comedi_device_attach) from [<81472b44>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:840b8000 r9:00000003 r8:00000001 r7:40946400 r6:b5403587 r5:846d0180 r4:20000440 [<81472a70>] (do_devconfig_ioctl) from [<81473e68>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000001 r7:40946400 r6:20000440 r5:846d0180 r4:87055f00 [<81473b14>] (comedi_unlocked_ioctl) from [<805b9fc0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81473b14>] (comedi_unlocked_ioctl) from [<805b9fc0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81473b14>] (comedi_unlocked_ioctl) from [<805b9fc0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81473b14>] (comedi_unlocked_ioctl) from [<805b9fc0>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:840b8000 r9:00000003 r8:87055f00 r7:20000440 r6:40946400 r5:87055f01 r4:00000000 [<805b9d7c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfce1fa8 to 0xdfce1ff0) 1fa0: 00000000 00000000 00000003 40946400 20000440 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76ff30dc 1fe0: 76ff2e88 76ff2e78 00018ebc 00130820 r10:00000036 r9:840b8000 r8:8020029c r7:00000036 r6:00346310 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