8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read [0000000e] *pgd=85040003, *pmd=e6ed1003 Internal error: Oops: 205 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 11899 Comm: syz.2.1970 Not tainted 6.15.0-rc5-syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at io_ring_buffer_select io_uring/kbuf.c:163 [inline] PC is at io_buffer_select+0x50/0x18c io_uring/kbuf.c:207 LR is at rcu_read_unlock include/linux/rcupdate.h:873 [inline] LR is at xa_load+0x68/0xa4 lib/xarray.c:1621 pc : [<80889a10>] lr : [<81a4be34>] psr: 20000013 sp : df815e00 ip : df815dc0 fp : df815e1c r10: 00000240 r9 : 80000001 r8 : 00000000 r7 : df815e40 r6 : 00000000 r5 : 85b42100 r4 : 85996e40 r3 : 00000001 r2 : 00000000 r1 : 841a1680 r0 : 00000000 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 855df240 DAC: 00000000 Register r0 information: NULL pointer Register r1 information: slab kmalloc-64 start 841a1680 pointer offset 0 size 64 Register r2 information: NULL pointer Register r3 information: non-paged memory Register r4 information: slab io_kiocb start 85996e40 pointer offset 0 size 192 Register r5 information: slab kmalloc-2k start 85b42000 pointer offset 256 size 2048 Register r6 information: NULL pointer Register r7 information: 2-page vmalloc region starting at 0xdf814000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r8 information: NULL pointer Register r9 information: non-slab/vmalloc memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdf814000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r12 information: 2-page vmalloc region starting at 0xdf814000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Process syz.2.1970 (pid: 11899, stack limit = 0xdf814000) Stack: (0xdf815e00 to 0xdf816000) 5e00: 835dc780 85996e40 85b6f000 80000001 df815e84 df815e20 80893278 808899cc 5e20: df815e4c df815e30 8089ec2c 8050a4c4 00010001 00000001 8057abbc 00000000 5e40: 00000000 00000006 85996e40 80000001 df815e84 c9873ef7 80886a40 85996e40 5e60: 81cf0ca0 00000000 80000001 81cf0b5c 0000001b 85084800 df815ebc df815e88 5e80: 80886bd8 80892f38 85996240 85996300 859963c0 85b42000 85996eac 85996e40 5ea0: 85900000 00000000 00000000 85084800 df815f14 df815ec0 808877a8 80886b7c 5ec0: 8088e164 81a4bdd8 00000000 00000000 00000800 00000800 81cf0b5c 00000800 5ee0: 85b42000 c9873ef7 857f03c0 00000000 85b42000 00003516 857f03c0 00000000 5f00: 85084800 00000000 df815fa4 df815f18 80888250 808875a8 ecac8b10 85b42040 5f20: 00000000 00000000 81a4fbb0 81a4fa80 df815f54 df815f40 8026b438 8029ce1c 5f40: df815fb0 40000000 df815f84 df815f58 802229dc 8026b3f4 00000000 8281d05c 5f60: df815fb0 0014c490 ecac8b10 80222930 00000000 c9873ef7 df815fac 00000000 5f80: 00000000 002e643c 000001aa 8020029c 85084800 000001aa 00000000 df815fa8 5fa0: 80200060 80888124 00000000 00000000 00000007 00003516 00000000 00000000 5fc0: 00000000 00000000 002e643c 000001aa 002d0000 00000000 00006364 76b2f0bc 5fe0: 76b2eec0 76b2eeb0 0001939c 00131f30 60000010 00000007 00000000 00000000 Call trace: [<808899c0>] (io_buffer_select) from [<80893278>] (io_recv_buf_select io_uring/net.c:1098 [inline]) [<808899c0>] (io_buffer_select) from [<80893278>] (io_recv+0x34c/0x46c io_uring/net.c:1138) r7:80000001 r6:85b6f000 r5:85996e40 r4:835dc780 [<80892f2c>] (io_recv) from [<80886bd8>] (__io_issue_sqe io_uring/io_uring.c:1740 [inline]) [<80892f2c>] (io_recv) from [<80886bd8>] (io_issue_sqe+0x68/0x658 io_uring/io_uring.c:1759) r10:85084800 r9:0000001b r8:81cf0b5c r7:80000001 r6:00000000 r5:81cf0ca0 r4:85996e40 [<80886b70>] (io_issue_sqe) from [<808877a8>] (io_queue_sqe io_uring/io_uring.c:1975 [inline]) [<80886b70>] (io_issue_sqe) from [<808877a8>] (io_submit_sqe io_uring/io_uring.c:2231 [inline]) [<80886b70>] (io_issue_sqe) from [<808877a8>] (io_submit_sqes+0x20c/0x938 io_uring/io_uring.c:2348) r10:85084800 r9:00000000 r8:00000000 r7:85900000 r6:85996e40 r5:85996eac r4:85b42000 [<8088759c>] (io_submit_sqes) from [<80888250>] (__do_sys_io_uring_enter io_uring/io_uring.c:3408 [inline]) [<8088759c>] (io_submit_sqes) from [<80888250>] (sys_io_uring_enter+0x138/0x780 io_uring/io_uring.c:3342) r10:00000000 r9:85084800 r8:00000000 r7:857f03c0 r6:00003516 r5:85b42000 r4:00000000 [<80888118>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf815fa8 to 0xdf815ff0) 5fa0: 00000000 00000000 00000007 00003516 00000000 00000000 5fc0: 00000000 00000000 002e643c 000001aa 002d0000 00000000 00006364 76b2f0bc 5fe0: 76b2eec0 76b2eeb0 0001939c 00131f30 r10:000001aa r9:85084800 r8:8020029c r7:000001aa r6:002e643c r5:00000000 r4:00000000 Code: e3130001 0a00002f e5910000 e1d120be (e1d030be) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e3130001 tst r3, #1 4: 0a00002f beq 0xc8 8: e5910000 ldr r0, [r1] c: e1d120be ldrh r2, [r1, #14] * 10: e1d030be ldrh r3, [r0, #14] <-- trapping instruction