8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read [0000000e] *pgd=858b9003, *pmd=e98fd003 Internal error: Oops: 205 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 10330 Comm: syz.1.1662 Not tainted 6.15.0-rc5-syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at io_ring_buffers_peek+0x24/0x258 io_uring/kbuf.c:227 LR is at io_buffers_select+0x94/0xfc io_uring/kbuf.c:310 pc : [<8088956c>] lr : [<80889be0>] psr: 20000013 sp : ed759db0 ip : ed759df8 fp : ed759df4 r10: f7eeffff r9 : 00000000 r8 : 850b8240 r7 : 00000000 r6 : 00004040 r5 : ed759e44 r4 : 85eb9000 r3 : 00000001 r2 : 8533970c r1 : ed759e44 r0 : 85eb9000 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85200fc0 DAC: 00000000 Register r0 information: slab io_kiocb start 85eb9000 pointer offset 0 size 192 Register r1 information: 2-page vmalloc region starting at 0xed758000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r2 information: slab kmalloc-256 start 85339700 pointer offset 12 size 256 Register r3 information: non-paged memory Register r4 information: slab io_kiocb start 85eb9000 pointer offset 0 size 192 Register r5 information: 2-page vmalloc region starting at 0xed758000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r6 information: non-paged memory Register r7 information: NULL pointer Register r8 information: slab kmalloc-64 start 850b8240 pointer offset 0 size 64 Register r9 information: NULL pointer Register r10 information: vmalloc memory Register r11 information: 2-page vmalloc region starting at 0xed758000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r12 information: 2-page vmalloc region starting at 0xed758000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Process syz.1.1662 (pid: 10330, stack limit = 0xed758000) Stack: (0xed759db0 to 0xed75a000) 9da0: 81a4be54 8030cb0c 84fa7100 00000000 9dc0: 00000000 8533970c 00000000 85eb9000 850b8240 00004040 00000000 ed759e44 9de0: 84fa7000 f7eeffff ed759e24 ed759df8 80889be0 80889554 00000001 00000000 9e00: 85eb9000 00004040 85339700 80000001 00000000 f7eeffff ed759e84 ed759e28 9e20: 8089263c 80889b58 8089ec2c 000000e8 ed759e5c ed759e40 8533970c 84976a00 9e40: 85eb9000 8533970c 00000000 200440c0 00000001 19e7c8f8 80886a40 85eb9000 9e60: 81cf0c94 00000000 80000001 81cf0b5c 0000001a 84185400 ed759ebc ed759e88 9e80: 80886bd8 80892328 85eb9000 85500000 85eb9000 84fa7000 85eb906c 85eb9000 9ea0: 85500000 00000000 00000000 84185400 ed759f14 ed759ec0 808877a8 80886b7c 9ec0: 8088e164 81a4bdf8 ed759f24 ed759ed8 00000001 00000001 81cf0b5c 00000001 9ee0: 84fa7000 19e7c8f8 855d0d80 00000000 84fa7000 000027e2 855d0d80 00000000 9f00: 84185400 00000000 ed759fa4 ed759f18 80888250 808875a8 ecac8b10 84fa7040 9f20: 00000000 00000000 81a4fbd0 81a4faa0 ed759f54 ed759f40 8026b438 8029ce1c 9f40: ed759fb0 40000000 ed759f84 ed759f58 802229dc 8026b3f4 00000000 8281d05c 9f60: ed759fb0 0014c490 ecac8b10 80222930 00000000 19e7c8f8 ed759fac 00000000 9f80: 00000000 002e630c 000001aa 8020029c 84185400 000001aa 00000000 ed759fa8 9fa0: 80200060 80888124 00000000 00000000 00000003 000027e2 00000000 00000000 9fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76bfa0bc 9fe0: 76bf9ec0 76bf9eb0 0001939c 00131f30 60000010 00000003 00000000 00000000 Call trace: [<80889548>] (io_ring_buffers_peek) from [<80889be0>] (io_buffers_select+0x94/0xfc io_uring/kbuf.c:310) r10:f7eeffff r9:84fa7000 r8:ed759e44 r7:00000000 r6:00004040 r5:850b8240 r4:85eb9000 [<80889b4c>] (io_buffers_select) from [<8089263c>] (io_send_select_buffer io_uring/net.c:587 [inline]) [<80889b4c>] (io_buffers_select) from [<8089263c>] (io_send+0x320/0x490 io_uring/net.c:635) r10:f7eeffff r9:00000000 r8:80000001 r7:85339700 r6:00004040 r5:85eb9000 r4:00000000 r3:00000001 [<8089231c>] (io_send) from [<80886bd8>] (__io_issue_sqe io_uring/io_uring.c:1740 [inline]) [<8089231c>] (io_send) from [<80886bd8>] (io_issue_sqe+0x68/0x658 io_uring/io_uring.c:1759) r10:84185400 r9:0000001a r8:81cf0b5c r7:80000001 r6:00000000 r5:81cf0c94 r4:85eb9000 [<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) r10:84185400 r9:00000000 r8:00000000 r7:85500000 r6:85eb9000 r5:85eb906c r4:84fa7000 [<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 r9:84185400 r8:00000000 r7:855d0d80 r6:000027e2 r5:84fa7000 r4:00000000 [<80888118>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xed759fa8 to 0xed759ff0) 9fa0: 00000000 00000000 00000003 000027e2 00000000 00000000 9fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76bfa0bc 9fe0: 76bf9ec0 76bf9eb0 0001939c 00131f30 r10:000001aa r9:84185400 r8:8020029c r7:000001aa r6:002e630c r5:00000000 r4:00000000 Code: e1a08002 e5912000 e50b2030 e1a05001 (e1d920be) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e1a08002 mov r8, r2 4: e5912000 ldr r2, [r1] 8: e50b2030 str r2, [fp, #-48] @ 0xffffffd0 c: e1a05001 mov r5, r1 * 10: e1d920be ldrh r2, [r9, #14] <-- trapping instruction