WARNING in __ioremap_caller

Status: upstream: reported C repro on 2026/10/08 22:47
Reported-by: syzbot+16eeca5ac6c5ad416034@syzkaller.appspotmail.com
First crash: 13d, last: 4d02h
▶ ▼ Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.6 WARNING in __ioremap_caller -1 syz, C 16 2d19h 13d 0/2 upstream: reported C repro on 2026/10/09 00:05
linux-6.1 WARNING in __ioremap_caller -1 syz, C 13 2d16h 13d 0/3 upstream: reported C repro on 2026/10/09 01:35
android-6-12 WARNING in __ioremap_caller origin:upstream -1 syz, C 2 10d 45d 0/1 premoderation: reported C repro on 2026/09/06 17:28
upstream WARNING in __ioremap_caller prio:high kernel -1 syz, C 334 3h27m 242d 2/29 upstream: reported C repro on 2026/02/22 11:33

Sample crash report:
ioremap: invalid physical address 8000000000000000
------------[ cut here ]------------
WARNING: CPU: 1 PID: 4338 at arch/x86/mm/ioremap.c:200 __ioremap_caller+0x4f8/0x620 arch/x86/mm/ioremap.c:198
Modules linked in:
CPU: 1 PID: 4338 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:__ioremap_caller+0x4f8/0x620 arch/x86/mm/ioremap.c:200
Code: 85 ff 00 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 89 69 43 00 48 8b 74 24 60 48 c7 c7 60 bc 28 8a e8 c8 b8 81 08 <0f> 0b eb 8d 4c 8b 74 24 28 41 81 e6 ff 0f 00 00 4d 01 ee 48 8b 7c
RSP: 0018:ffffc9000312f900 EFLAGS: 00010246
RAX: 0000000000000032 RBX: 1ffff92000625f00 RCX: 6ce808780d11b200
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc9000312fa10 R08: ffff8880b8f33d7f R09: 1ffff110171e67af
R10: dffffc0000000000 R11: ffffed10171e67b0 R12: 000000000000002e
R13: 8000000000000000 R14: 0000000000020000 R15: dffffc0000000000
FS:  000055558efbc500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30963fff CR3: 0000000021f22000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 register_device drivers/mtd/devices/phram.c:102 [inline]
 phram_setup+0x87c/0xdf0 drivers/mtd/devices/phram.c:281
 param_attr_store+0x20a/0x300 kernel/params.c:585
 module_attr_store+0x5b/0x80 kernel/params.c:905
 kernfs_fop_write_iter+0x3a8/0x500 fs/kernfs/file.c:296
 call_write_iter include/linux/fs.h:2179 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0x748/0xd70 fs/read_write.c:594
 ksys_write+0x153/0x260 fs/read_write.c:647
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f97196021d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff7c7c99c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f9719889fa0 RCX: 00007f97196021d9
RDX: 000000000000001d RSI: 0000200000000200 RDI: 0000000000000003
RBP: 00007f9719699888 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9719889fac R14: 00007f9719889fa0 R15: 00007f9719889fa0
 </TASK>

Crashes (14):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/09 03:23 linux-5.15.y a051a4bf909f b2734a59 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in __ioremap_caller
2026/10/18 09:42 linux-5.15.y 792fbe1537d8 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in __ioremap_caller
2026/10/18 09:40 linux-5.15.y 792fbe1537d8 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in __ioremap_caller
2026/10/16 17:24 linux-5.15.y 792fbe1537d8 4c840a2f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in __ioremap_caller
2026/10/16 17:05 linux-5.15.y 792fbe1537d8 4c840a2f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in __ioremap_caller
2026/10/16 17:05 linux-5.15.y 792fbe1537d8 4c840a2f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in __ioremap_caller
2026/10/16 17:03 linux-5.15.y 792fbe1537d8 4c840a2f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in __ioremap_caller
2026/10/16 17:03 linux-5.15.y 792fbe1537d8 4c840a2f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in __ioremap_caller
2026/10/08 23:13 linux-5.15.y a051a4bf909f b2734a59 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in __ioremap_caller
2026/10/08 23:13 linux-5.15.y a051a4bf909f b2734a59 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in __ioremap_caller
2026/10/08 22:58 linux-5.15.y a051a4bf909f b2734a59 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in __ioremap_caller
2026/10/08 22:56 linux-5.15.y a051a4bf909f b2734a59 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in __ioremap_caller
2026/10/08 22:47 linux-5.15.y a051a4bf909f b2734a59 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in __ioremap_caller
2026/10/08 22:47 linux-5.15.y a051a4bf909f b2734a59 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in __ioremap_caller
* Struck through repros no longer work on HEAD.